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  • Translation–rotation–translation interconversions
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-04-19
    Zhisong Wang

    Translation–rotation–translation interconversions Translation–rotation–translation interconversions, Published online: 19 April 2018; doi:10.1038/s41565-018-0140-0 RNA polymerase-based nanomotors can not only rotate a supramolecular wheel, but can also walk along a predefined linear track — autonomously and unidirectionally.

    更新日期:2018-04-19
  • Reorganization energy upon charging a single molecule on an insulator measured by atomic force microscopy
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-04-16
    Shadi Fatayer, Bruno Schuler, Wolfram Steurer, Ivan Scivetti, Jascha Repp, Leo Gross, Mats Persson, Gerhard Meyer

    Intermolecular single-electron transfer on electrically insulating films is a key process in molecular electronics1,2,3,4 and an important example of a redox reaction5,6. Electron-transfer rates in molecular systems depend on a few fundamental parameters, such as interadsorbate distance, temperature and, in particular, the Marcus reorganization energy7. This crucial parameter is the energy gain that results from the distortion of the equilibrium nuclear geometry in the molecule and its environment on charging8,9. The substrate, especially ionic films10, can have an important influence on the reorganization energy11,12. Reorganization energies are measured in electrochemistry13 as well as with optical14,15 and photoemission spectroscopies16,17, but not at the single-molecule limit and nor on insulating surfaces. Atomic force microscopy (AFM), with single-charge sensitivity18,19,20,21,22, atomic-scale spatial resolution20 and operable on insulating films, overcomes these challenges. Here, we investigate redox reactions of single naphthalocyanine (NPc) molecules on multilayered NaCl films. Employing the atomic force microscope as an ultralow current meter allows us to measure the differential conductance related to transitions between two charge states in both directions. Thereby, the reorganization energy of NPc on NaCl is determined as (0.8 ± 0.2) eV, and density functional theory (DFT) calculations provide the atomistic picture of the nuclear relaxations on charging. Our approach presents a route to perform tunnelling spectroscopy of single adsorbates on insulating substrates and provides insight into single-electron intermolecular transport.

    更新日期:2018-04-16
  • Reorganization takes energy
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-04-16
    Alexander L. Shluger, Peter Grutter

    Reorganization takes energy Reorganization takes energy, Published online: 16 April 2018; doi:10.1038/s41565-018-0094-2 Atomic force microscopy is used to measure reorganization energies upon charging individual molecules adsorbed on insulators.

    更新日期:2018-04-16
  • 2D magnetism gets hot
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-04-10

    2D magnetism gets hot 2D magnetism gets hot, Published online: 10 April 2018; doi:10.1038/s41565-018-0128-9 The demonstration of room-temperature ferromagnetism in an atomically thin layer broadens the prospects for device applications of 2D van der Waals materials.

    更新日期:2018-04-11
  • Scalable thermal insulator
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-04-10
    Wenjie Sun

    Scalable thermal insulator Scalable thermal insulator, Published online: 10 April 2018; doi:10.1038/s41565-018-0127-x Scalable thermal insulator

    更新日期:2018-04-11
  • Low-energy desalination
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-04-10
    Huanting Wang

    Low-energy desalination Low-energy desalination, Published online: 10 April 2018; doi:10.1038/s41565-018-0118-y A nanoporous membrane made of carbon nanofibres and a porous ceramic substrate shows superfast water vapour transport while blocking salts.

    更新日期:2018-04-11
  • A new metallene arrival
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-04-10
    Olga Bubnova

    A new metallene arrival A new metallene arrival, Published online: 10 April 2018; doi:10.1038/s41565-018-0125-z A new metallene arrival

    更新日期:2018-04-11
  • Denominational interpretations of nanotech
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-04-10
    Chris Toumey

    Denominational interpretations of nanotech Denominational interpretations of nanotech, Published online: 10 April 2018; doi:10.1038/s41565-018-0116-0 Religious people tend to have a different view of nanotechnology than non-religious people. Chris Toumey explores whether there are also different views between different religious groups.

    更新日期:2018-04-11
  • Quantum dots on your mind
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-04-10

    Quantum dots on your mind Quantum dots on your mind, Published online: 10 April 2018; doi:10.1038/s41565-018-0129-8 Colloidal quantum dots can provide important information on electrical activity in neurons despite the difficulty of in vivo experiments.

    更新日期:2018-04-11
  • Evaluating the potential of using quantum dots for monitoring electrical signals in neurons
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-04-10
    Alexander L. Efros, James B. Delehanty, Alan L. Huston, Igor L. Medintz, Mladen Barbic, Timothy D. Harris

    Success in the projects aimed at providing an advanced understanding of the brain is directly predicated on making critical advances in nanotechnology. This Perspective addresses the unique interface of neuroscience and nanomaterials by considering the foundational problem of sensing neuron membrane voltage and offers a potential solution that may be facilitated by a prototypical nanomaterial. Despite substantial improvements, the visualization of instantaneous voltage changes within individual neurons, whether in cell culture or in vivo, at both the single-cell and network level at high speed remains complex and problematic. The unique properties of semiconductor quantum dots (QDs) have made them powerful fluorophores for bioimaging. What is not widely appreciated, however, is that QD photoluminescence is exquisitely sensitive to proximal electric fields. This property should be suitable for sensing voltage changes that occur in the active neuronal membrane. Here, we examine the potential role of QDs in addressing the important challenge of real-time optical voltage imaging.

    更新日期:2018-04-11
  • Science and style
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-04-10
    Giacomo Prando

    Science and style Science and style, Published online: 10 April 2018; doi:10.1038/s41565-018-0114-2 Giacomo Prando explains how his experience as an editor helped him broaden his horizons as a scientist.

    更新日期:2018-04-11
  • Believe in the force
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-04-09
    Ingmar Swart

    Believe in the forceBelieve in the force, Published online: 09 April 2018; doi:10.1038/s41565-018-0110-6The use of rigid copper oxide tips makes high-resolution molecular imaging by non-contact atomic force microscopy more reliable.

    更新日期:2018-04-10
  • Experimental observation of chiral magnetic bobbers in B20-type FeGe
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-04-09
    Fengshan Zheng, Filipp N. Rybakov, Aleksandr B. Borisov, Dongsheng Song, Shasha Wang, Zi-An Li, Haifeng Du, Nikolai S. Kiselev, Jan Caron, András Kovács, Mingliang Tian, Yuheng Zhang, Stefan Blügel, Rafal E. Dunin-Borkowski

    Chiral magnetic skyrmions1,2 are nanoscale vortex-like spin textures that form in the presence of an applied magnetic field in ferromagnets that support the Dzyaloshinskii–Moriya interaction (DMI) because of strong spin–orbit coupling and broken inversion symmetry of the crystal3,4. In sharp contrast to other systems5,6 that allow for the formation of a variety of two-dimensional (2D) skyrmions, in chiral magnets the presence of the DMI commonly prevents the stability and coexistence of topological excitations of different types7. Recently, a new type of localized particle-like object—the chiral bobber (ChB)—was predicted theoretically in such materials8. However, its existence has not yet been verified experimentally. Here, we report the direct observation of ChBs in thin films of B20-type FeGe by means of quantitative off-axis electron holography (EH). We identify the part of the temperature–magnetic field phase diagram in which ChBs exist and distinguish two mechanisms for their nucleation. Furthermore, we show that ChBs are able to coexist with skyrmions over a wide range of parameters, which suggests their possible practical applications in novel magnetic solid-state memory devices, in which a stream of binary data bits can be encoded by a sequence of skyrmions and bobbers.

    更新日期:2018-04-10
  • Quantitative assessment of intermolecular interactions by atomic force microscopy imaging using copper oxide tips
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-04-09
    Harry Mönig, Saeed Amirjalayer, Alexander Timmer, Zhixin Hu, Lacheng Liu, Oscar Díaz Arado, Marvin Cnudde, Cristian Alejandro Strassert, Wei Ji, Michael Rohlfing, Harald Fuchs

    Atomic force microscopy is an impressive tool with which to directly resolve the bonding structure of organic compounds1,2,3,4,5. The methodology usually involves chemical passivation of the probe-tip termination by attaching single molecules or atoms such as CO or Xe (refs 1,6,7,8,9). However, these probe particles are only weakly connected to the metallic apex, which results in considerable dynamic deflection. This probe particle deflection leads to pronounced image distortions, systematic overestimation of bond lengths, and in some cases even spurious bond-like contrast features, thus inhibiting reliable data interpretation8–12. Recently, an alternative approach to tip passivation has been used in which slightly indenting a tip into oxidized copper substrates and subsequent contrast analysis allows for the verification of an oxygen-terminated Cu tip13,14,15. Here we show that, due to the covalently bound configuration of the terminal oxygen atom, this copper oxide tip (CuOx tip) has a high structural stability, allowing not only a quantitative determination of individual bond lengths and access to bond order effects, but also reliable intermolecular bond characterization. In particular, by removing the previous limitations of flexible probe particles, we are able to provide conclusive experimental evidence for an unusual intermolecular N–Au–N three-centre bond. Furthermore, we demonstrate that CuOx tips allow the characterization of the strength and configuration of individual hydrogen bonds within a molecular assembly.

    更新日期:2018-04-10
  • A bio-hybrid DNA rotor–stator nanoengine that moves along predefined tracks
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-04-09
    Julián Valero, Nibedita Pal, Soma Dhakal, Nils G. Walter, Michael Famulok

    Biological motors are highly complex protein assemblies that generate linear or rotary motion, powered by chemical energy. Synthetic motors based on DNA nanostructures, bio-hybrid designs or synthetic organic chemistry have been assembled. However, unidirectionally rotating biomimetic wheel motors with rotor–stator units that consume chemical energy are elusive. Here, we report a bio-hybrid nanoengine consisting of a catalytic stator that unidirectionally rotates an interlocked DNA wheel, powered by NTP hydrolysis. The engine consists of an engineered T7 RNA polymerase (T7RNAP-ZIF) attached to a dsDNA nanoring that is catenated to a rigid rotating dsDNA wheel. The wheel motor produces long, repetitive RNA transcripts that remain attached to the engine and are used to guide its movement along predefined ssDNA tracks arranged on a DNA nanotube. The simplicity of the design renders this walking nanoengine adaptable to other biological nanoarchitectures, facilitating the construction of complex bio-hybrid structures that achieve NTP-driven locomotion.

    更新日期:2018-04-10
  • A semi-floating gate memory based on van der Waals heterostructures for quasi-non-volatile applications
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-04-09
    Chunsen Liu, Xiao Yan, Xiongfei Song, Shijin Ding, David Wei Zhang, Peng Zhou

    As conventional circuits based on field-effect transistors are approaching their physical limits due to quantum phenomena, semi-floating gate transistors have emerged as an alternative ultrafast and silicon-compatible technology. Here, we show a quasi-non-volatile memory featuring a semi-floating gate architecture with band-engineered van der Waals heterostructures. This two-dimensional semi-floating gate memory demonstrates 156 times longer refresh time with respect to that of dynamic random access memory and ultrahigh-speed writing operations on nanosecond timescales. The semi-floating gate architecture greatly enhances the writing operation performance and is approximately 106 times faster than other memories based on two-dimensional materials. The demonstrated characteristics suggest that the quasi-non-volatile memory has the potential to bridge the gap between volatile and non-volatile memory technologies and decrease the power consumption required for frequent refresh operations, enabling a high-speed and low-power random access memory.

    更新日期:2018-04-10
  • Non-invasive, transdermal, path-selective and specific glucose monitoring via a graphene-based platform
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-04-09
    Luca Lipani, Bertrand G. R. Dupont, Floriant Doungmene, Frank Marken, Rex M. Tyrrell, Richard H. Guy, Adelina Ilie

    Currently, there is no available needle-free approach for diabetics to monitor glucose levels in the interstitial fluid. Here, we report a path-selective, non-invasive, transdermal glucose monitoring system based on a miniaturized pixel array platform (realized either by graphene-based thin-film technology, or screen-printing). The system samples glucose from the interstitial fluid via electroosmotic extraction through individual, privileged, follicular pathways in the skin, accessible via the pixels of the array. A proof of principle using mammalian skin ex vivo is demonstrated for specific and ‘quantized’ glucose extraction/detection via follicular pathways, and across the hypo- to hyper-glycaemic range in humans. Furthermore, the quantification of follicular and non-follicular glucose extraction fluxes is clearly shown. In vivo continuous monitoring of interstitial fluid-borne glucose with the pixel array was able to track blood sugar in healthy human subjects. This approach paves the way to clinically relevant glucose detection in diabetics without the need for invasive, finger-stick blood sampling.

    更新日期:2018-04-10
  • Publisher Correction: 2D MoS2 as an efficient protective layer for lithium metal anodes in high-performance Li–S batteries
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-04-04
    Eunho Cha, Mumukshu D. Patel, Juhong Park, Jeongwoon Hwang, Vish Prasad, Kyeongjae Cho, Wonbong Choi

    Publisher Correction: 2D MoS2 as an efficient protective layer for lithium metal anodes in high-performance Li–S batteries Publisher Correction: 2D MoS2 as an efficient protective layer for lithium metal anodes in high-performance Li–S batteries, Published online: 04 April 2018; doi:10.1038/s41565-018-0095-1 Publisher Correction: 2D MoS2 as an efficient protective layer for lithium metal anodes in high-performance Li–S batteries

    更新日期:2018-04-04
  • Nanoparticle-induced neuronal toxicity across placental barriers is mediated by autophagy and dependent on astrocytes
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-04-02
    Simon J. Hawkins, Lucy A. Crompton, Aman Sood, Margaret Saunders, Noreen T. Boyle, Amy Buckley, Aedín M. Minogue, Sarah F. McComish, Natalia Jiménez-Moreno, Oscar Cordero-Llana, Petros Stathakos, Catherine E. Gilmore, Stephen Kelly, Jon D. Lane, C. Patrick Case, Maeve A. Caldwell

    The potential for maternal nanoparticle (NP) exposures to cause developmental toxicity in the fetus without the direct passage of NPs has previously been shown, but the mechanism remained elusive. We now demonstrate that exposure of cobalt and chromium NPs to BeWo cell barriers, an in vitro model of the human placenta, triggers impairment of the autophagic flux and release of interleukin-6. This contributes to the altered differentiation of human neural progenitor cells and DNA damage in the derived neurons and astrocytes. Crucially, neuronal DNA damage is mediated by astrocytes. Inhibiting the autophagic degradation in the BeWo barrier by overexpression of the dominant-negative human ATG4BC74A significantly reduces the levels of DNA damage in astrocytes. In vivo, indirect NP toxicity in mice results in neurodevelopmental abnormalities with reactive astrogliosis and increased DNA damage in the fetal hippocampus. Our results demonstrate the potential importance of autophagy to elicit NP toxicity and the risk of indirect developmental neurotoxicity after maternal NP exposure.

    更新日期:2018-04-03
  • An artificial molecular machine that builds an asymmetric catalyst
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-04-02
    Guillaume De Bo, Malcolm A. Y. Gall, Sonja Kuschel, Julien De Winter, Pascal Gerbaux, David A. Leigh

    Biomolecular machines perform types of complex molecular-level tasks that artificial molecular machines can aspire to. The ribosome, for example, translates information from the polymer track it traverses (messenger RNA) to the new polymer it constructs (a polypeptide)1. The sequence and number of codons read determines the sequence and number of building blocks incorporated into the biomachine-synthesized polymer. However, neither control of sequence2,3 nor the transfer of length information from one polymer to another (which to date has only been accomplished in man-made systems through template synthesis)4 is easily achieved in the synthesis of artificial macromolecules. Rotaxane-based molecular machines5,6,7 have been developed that successively add amino acids8,9,10 (including β-amino acids10) to a growing peptide chain by the action of a macrocycle moving along a mono-dispersed oligomeric track derivatized with amino-acid phenol esters. The threaded macrocycle picks up groups that block its path and links them through successive native chemical ligation reactions11 to form a peptide sequence corresponding to the order of the building blocks on the track. Here, we show that as an alternative to translating sequence information, a rotaxane molecular machine can transfer the narrow polydispersity of a leucine-ester-derivatized polystyrene chain synthesized by atom transfer radical polymerization12 to a molecular-machine-made homo-leucine oligomer. The resulting narrow-molecular-weight oligomer folds to an α-helical secondary structure13 that acts as an asymmetric catalyst for the Juliá–Colonna epoxidation14,15 of chalcones.

    更新日期:2018-04-03
  • Highly efficient solar vapour generation via hierarchically nanostructured gels
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-04-02
    Fei Zhao, Xingyi Zhou, Ye Shi, Xin Qian, Megan Alexander, Xinpeng Zhao, Samantha Mendez, Ronggui Yang, Liangti Qu, Guihua Yu

    Solar vapour generation is an efficient way of harvesting solar energy for the purification of polluted or saline water. However, water evaporation suffers from either inefficient utilization of solar energy or relies on complex and expensive light-concentration accessories. Here, we demonstrate a hierarchically nanostructured gel (HNG) based on polyvinyl alcohol (PVA) and polypyrrole (PPy) that serves as an independent solar vapour generator. The converted energy can be utilized in situ to power the vaporization of water contained in the molecular meshes of the PVA network, where water evaporation is facilitated by the skeleton of the hydrogel. A floating HNG sample evaporated water with a record high rate of 3.2 kg m−2 h−1 via 94% solar energy from 1 sun irradiation, and 18–23 litres of water per square metre of HNG was delivered daily when purifying brine water. These values were achievable due to the reduced latent heat of water evaporation in the molecular mesh under natural sunlight.

    更新日期:2018-04-03
  • Superparamagnetic nickel colloidal nanocrystal clusters with antibacterial activity and bacteria binding ability
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-04-02
    Bo Peng, Xinglin Zhang, Dirk G. A. L. Aarts, Roel P. A. Dullens

    Recent progress in synthetic nanotechnology and the ancient use of metals in food preservation and the antibacterial treatment of wounds have prompted the development of nanometallic materials for antimicrobial applications1,2,3,4. However, the materials designed so far do not simultaneously display antimicrobial activity and the capability of binding and capturing bacteria and spores. Here, we develop a one-step pyrolysis procedure to synthesize monodisperse superparamagnetic nickel colloidal nanocrystal clusters (SNCNCs), which show both antibacterial activity and the ability to bind Gram-positive (Bacillus subtilis) and Gram-negative (Escherichia coli) bacteria, as well as bacterial spores. The SNCNCs are formed from a rapid burst of nickel nanoparticles, which self-assemble slowly into clusters. The clusters can magnetically extract 99.99% of bacteria and spores and provide a promising approach for the removal of microbes, including hard-to-treat microorganisms. We believe that our work illustrates the exciting opportunities that nanotechnology offers for alternative antimicrobial strategies and other applications in microbiology.

    更新日期:2018-04-03
  • When radionuclides meet nanoparticles
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-03-26
    Gang Niu, Xiaoyuan Chen

    When radionuclides meet nanoparticles When radionuclides meet nanoparticles, Published online: 26 March 2018; doi:10.1038/s41565-018-0103-5 Interaction between radionuclides and nanoparticles expands the in vivo imaging possibilities based on Cerenkov luminescence.

    更新日期:2018-03-26
  • Nanoparticles as multimodal photon transducers of ionizing radiation
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-03-26
    Edwin C. Pratt, Travis M. Shaffer, Qize Zhang, Charles Michael Drain, Jan Grimm

    In biomedical imaging, nanoparticles combined with radionuclides that generate Cerenkov luminescence are used in diagnostic imaging, photon-induced therapies and as activatable probes. In these applications, the nanoparticle is often viewed as a carrier inert to ionizing radiation from the radionuclide. However, certain phenomena such as enhanced nanoparticle luminescence and generation of reactive oxygen species cannot be completely explained by Cerenkov luminescence interactions with nanoparticles. Herein, we report methods to examine the mechanisms of nanoparticle excitation by radionuclides, including interactions with Cerenkov luminescence, β particles and γ radiation. We demonstrate that β-scintillation contributes appreciably to excitation and reactivity in certain nanoparticle systems, and that excitation by radionuclides of nanoparticles composed of large atomic number atoms generates X-rays, enabling multiplexed imaging through single photon emission computed tomography. These findings demonstrate practical optical imaging and therapy using radionuclides with emission energies below the Cerenkov threshold, thereby expanding the list of applicable radionuclides.

    更新日期:2018-03-26
  • Transition from direct to inverted charge transport Marcus regions in molecular junctions via molecular orbital gating
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-03-26
    Li Yuan, Lejia Wang, Alvar R. Garrigues, Li Jiang, Harshini Venkata Annadata, Marta Anguera Antonana, Enrique Barco, Christian A. Nijhuis

    Solid-state molecular tunnel junctions are often assumed to operate in the Landauer regime, which describes essentially activationless coherent tunnelling processes. In solution, on the other hand, charge transfer is described by Marcus theory, which accounts for thermally activated processes. In practice, however, thermally activated transport phenomena are frequently observed also in solid-state molecular junctions but remain poorly understood. Here, we show experimentally the transition from the Marcus to the inverted Marcus region in a solid-state molecular tunnel junction by means of intra-molecular orbital gating that can be tuned via the chemical structure of the molecule and applied bias. In the inverted Marcus region, charge transport is incoherent, yet virtually independent of temperature. Our experimental results fit well to a theoretical model that combines Landauer and Marcus theories and may have implications for the interpretation of temperature-dependent charge transport measurements in molecular junctions.

    更新日期:2018-03-26
  • Charge transport in the inverted Marcus region
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-03-26
    Joshua Hihath

    Charge transport in the inverted Marcus region Charge transport in the inverted Marcus region, Published online: 26 March 2018; doi:10.1038/s41565-018-0115-1 Observation of temperature-independent conduction in a self-assembled monolayer may hint at an unexplored charge-transport regime.

    更新日期:2018-03-26
  • Confinement-induced liquid crystalline transitions in amyloid fibril cholesteric tactoids
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-03-19
    Gustav Nyström, Mario Arcari, Raffaele Mezzenga

    Chirality is ubiquitous in nature and plays crucial roles in biology, medicine, physics and materials science. Understanding and controlling chirality is therefore an important research challenge with broad implications. Unlike other chiral colloids, such as nanocellulose or filamentous viruses, amyloid fibrils form nematic phases but appear to miss their twisted form, the cholesteric or chiral nematic phases, despite a well-defined chirality at the single fibril level. Here we report the discovery of cholesteric phases in amyloids, using β-lactoglobulin fibrils shortened by shear stresses. The physical behaviour of these new cholesteric materials exhibits unprecedented structural complexity, with confinement-driven ordering transitions between at least three types of nematic and cholesteric tactoids. We use energy functional theory to rationalize these results and observe a chirality inversion from the left-handed amyloids to right-handed cholesteric droplets. These findings deepen our understanding of cholesteric phases, advancing their use in soft nanotechnology, nanomaterial templating and self-assembly.

    更新日期:2018-03-20
  • Synergetic interaction between neighbouring platinum monomers in CO2 hydrogenation
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-03-19
    Hongliang Li, Liangbing Wang, Yizhou Dai, Zhengtian Pu, Zhuohan Lao, Yawei Chen, Menglin Wang, Xusheng Zheng, Junfa Zhu, Wenhua Zhang, Rui Si, Chao Ma, Jie Zeng

    Exploring the interaction between two neighbouring monomers has great potential to significantly raise the performance and deepen the mechanistic understanding of heterogeneous catalysis. Herein, we demonstrate that the synergetic interaction between neighbouring Pt monomers on MoS2 greatly enhanced the CO2 hydrogenation catalytic activity and reduced the activation energy relative to isolated monomers. Neighbouring Pt monomers were achieved by increasing the Pt mass loading up to 7.5% while maintaining the atomic dispersion of Pt. Mechanistic studies reveal that neighbouring Pt monomers not only worked in synergy to vary the reaction barrier, but also underwent distinct reaction paths compared with isolated monomers. Isolated Pt monomers favour the conversion of CO2 into methanol without the formation of formic acid, whereas CO2 is hydrogenated stepwise into formic acid and methanol for neighbouring Pt monomers. The discovery of the synergetic interaction between neighbouring monomers may create a new path for manipulating catalytic properties.

    更新日期:2018-03-20
  • Spin–photon interface and spin-controlled photon switching in a nanobeam waveguide
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-03-19
    Alisa Javadi, Dapeng Ding, Martin Hayhurst Appel, Sahand Mahmoodian, Matthias Christian Löbl, Immo Söllner, Rüdiger Schott, Camille Papon, Tommaso Pregnolato, Søren Stobbe, Leonardo Midolo, Tim Schröder, Andreas Dirk Wieck, Arne Ludwig, Richard John Warburton, Peter Lodahl

    The spin of an electron is a promising memory state and qubit. Connecting spin states that are spatially far apart will enable quantum nodes and quantum networks based on the electron spin. Towards this goal, an integrated spin–photon interface would be a major leap forward as it combines the memory capability of a single spin with the efficient transfer of information by photons. Here, we demonstrate such an efficient and optically programmable interface between the spin of an electron in a quantum dot and photons in a nanophotonic waveguide. The spin can be deterministically prepared in the ground state with a fidelity of up to 96%. Subsequently, the system is used to implement a single-spin photonic switch, in which the spin state of the electron directs the flow of photons through the waveguide. The spin–photon interface may enable on-chip photon–photon gates, single-photon transistors and the efficient generation of a photonic cluster state.

    更新日期:2018-03-20
  • Large tunable valley splitting in edge-free graphene quantum dots on boron nitride
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-03-19
    Nils M. Freitag, Tobias Reisch, Larisa A. Chizhova, Péter Nemes-Incze, Christian Holl, Colin R. Woods, Roman V. Gorbachev, Yang Cao, Andre K. Geim, Kostya S. Novoselov, Joachim Burgdörfer, Florian Libisch, Markus Morgenstern

    Coherent manipulation of the binary degrees of freedom is at the heart of modern quantum technologies. Graphene offers two binary degrees: the electron spin and the valley. Efficient spin control has been demonstrated in many solid-state systems, whereas exploitation of the valley has only recently been started, albeit without control at the single-electron level. Here, we show that van der Waals stacking of graphene onto hexagonal boron nitride offers a natural platform for valley control. We use a graphene quantum dot induced by the tip of a scanning tunnelling microscope and demonstrate valley splitting that is tunable from −5 to +10 meV (including valley inversion) by sub-10-nm displacements of the quantum dot position. This boosts the range of controlled valley splitting by about one order of magnitude. The tunable inversion of spin and valley states should enable coherent superposition of these degrees of freedom as a first step towards graphene-based qubits.

    更新日期:2018-03-20
  • Transport of hydrogen isotopes through interlayer spacing in van der Waals crystals
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-03-19
    S. Hu, K. Gopinadhan, A. Rakowski, M. Neek-Amal, T. Heine, I. V. Grigorieva, S. J. Haigh, F. M. Peeters, A. K. Geim, M. Lozada-Hidalgo

    Atoms start behaving as waves rather than classical particles if confined in spaces commensurate with their de Broglie wavelength. At room temperature this length is only about one ångström even for the lightest atom, hydrogen. This restricts quantum-confinement phenomena for atomic species to the realm of very low temperatures1,2,3,4,5. Here, we show that van der Waals gaps between atomic planes of layered crystals provide ångström-size channels that make quantum confinement of protons apparent even at room temperature. Our transport measurements show that thermal protons experience a notably higher barrier than deuterons when entering van der Waals gaps in hexagonal boron nitride and molybdenum disulfide. This is attributed to the difference in the de Broglie wavelengths of the isotopes. Once inside the crystals, transport of both isotopes can be described by classical diffusion, albeit with unexpectedly fast rates comparable to that of protons in water. The demonstrated ångström-size channels can be exploited for further studies of atomistic quantum confinement and, if the technology can be scaled up, for sieving hydrogen isotopes.

    更新日期:2018-03-20
  • Selective control of multiple ferroelectric switching pathways using a trailing flexoelectric field
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-03-12
    Sung Min Park, Bo Wang, Saikat Das, Seung Chul Chae, Jin-Seok Chung, Jong-Gul Yoon, Long-Qing Chen, Sang Mo Yang, Tae Won Noh

    Flexoelectricity is an electromechanical coupling between electrical polarization and a strain gradient1 that enables mechanical manipulation of polarization without applying an electrical bias2,3. Recently, flexoelectricity was directly demonstrated by mechanically switching the out-of-plane polarization of a uniaxial system with a scanning probe microscope tip3,4. However, the successful application of flexoelectricity in low-symmetry multiaxial ferroelectrics and therefore active manipulation of multiple domains via flexoelectricity have not yet been achieved. Here, we demonstrate that the symmetry-breaking flexoelectricity offers a powerful route for the selective control of multiple domain switching pathways in multiaxial ferroelectric materials. Specifically, we use a trailing flexoelectric field that is created by the motion of a mechanically loaded scanning probe microscope tip. By controlling the SPM scan direction, we can deterministically select either stable 71° ferroelastic switching or 180° ferroelectric switching in a multiferroic magnetoelectric BiFeO3 thin film. Phase-field simulations reveal that the amplified in-plane trailing flexoelectric field is essential for this domain engineering. Moreover, we show that mechanically switched domains have a good retention property. This work opens a new avenue for the deterministic selection of nanoscale ferroelectric domains in low-symmetry materials for non-volatile magnetoelectric devices and multilevel data storage.

    更新日期:2018-03-13
  • Current polarity-dependent manipulation of antiferromagnetic domains
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-03-12
    Peter Wadley, Sonka Reimers, Michal J. Grzybowski, Carl Andrews, Mu Wang, Jasbinder S. Chauhan, Bryan L. Gallagher, Richard P. Campion, Kevin W. Edmonds, Sarnjeet S. Dhesi, Francesco Maccherozzi, Vit Novak, Joerg Wunderlich, Tomas Jungwirth

    Antiferromagnets have several favourable properties as active elements in spintronic devices, including ultra-fast dynamics, zero stray fields and insensitivity to external magnetic fields1. Tetragonal CuMnAs is a testbed system in which the antiferromagnetic order parameter can be switched reversibly at ambient conditions using electrical currents2. In previous experiments, orthogonal in-plane current pulses were used to induce 90° rotations of antiferromagnetic domains and demonstrate the operation of all-electrical memory bits in a multi-terminal geometry3. Here, we demonstrate that antiferromagnetic domain walls can be manipulated to realize stable and reproducible domain changes using only two electrical contacts. This is achieved by using the polarity of the current to switch the sign of the current-induced effective field acting on the antiferromagnetic sublattices. The resulting reversible domain and domain wall reconfigurations are imaged using X-ray magnetic linear dichroism microscopy, and can also be detected electrically. Switching by domain-wall motion can occur at much lower current densities than those needed for coherent domain switching.

    更新日期:2018-03-13
  • Kinesin expands and stabilizes the GDP-microtubule lattice
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-03-12
    Daniel R. Peet, Nigel J. Burroughs, Robert A. Cross

    Kinesin-1 is a nanoscale molecular motor that walks towards the fast-growing (plus) ends of microtubules, hauling molecular cargo to specific reaction sites in cells. Kinesin-driven transport is central to the self-organization of eukaryotic cells and shows great promise as a tool for nano-engineering1. Recent work hints that kinesin may also play a role in modulating the stability of its microtubule track, both in vitro2,3 and in vivo4, but the results are conflicting5,6,7 and the mechanisms are unclear. Here, we report a new dimension to the kinesin–microtubule interaction, whereby strong-binding state (adenosine triphosphate (ATP)-bound and apo) kinesin-1 motor domains inhibit the shrinkage of guanosine diphosphate (GDP) microtubules by up to two orders of magnitude and expand their lattice spacing by ~1.6%. Our data reveal an unexpected mechanism by which the mechanochemical cycles of kinesin and tubulin interlock, and so allow motile kinesins to influence the structure, stability and mechanics of their microtubule track.

    更新日期:2018-03-13
  • Doing your own thing
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-03-06
    Fraser Stoddart

    Doing your own thing Doing your own thing, Published online: 06 March 2018; doi:10.1038/s41565-018-0090-6 The spirit of collaboration in a one-room schoolhouse in rural Scotland served as a model for being creative in science, as Fraser Stoddart explains, recounting his journey to Stockholm.

    更新日期:2018-03-07
  • A different view of the environment
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-03-06

    A different view of the environment A different view of the environment, Published online: 06 March 2018; doi:10.1038/s41565-018-0106-2 Applying a method commonly used in microbiology provides a new way to study the interaction of nanoparticles with environmental samples.

    更新日期:2018-03-07
  • Crystal casting
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-03-06
    Olga Bubnova

    Crystal casting Crystal casting, Published online: 06 March 2018; doi:10.1038/s41565-018-0098-y Crystal casting

    更新日期:2018-03-07
  • A reversible morphology
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-03-06
    Alberto Moscatelli

    A reversible morphology A reversible morphology, Published online: 06 March 2018; doi:10.1038/s41565-018-0101-7 A reversible morphology

    更新日期:2018-03-07
  • Twofold topology
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-03-06
    Benjamin Heinrich

    Twofold topology Twofold topology, Published online: 06 March 2018; doi:10.1038/s41565-018-0099-x Twofold topology

    更新日期:2018-03-07
  • Quantum engineering of transistors based on 2D materials heterostructures
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-03-06
    Giuseppe Iannaccone, Francesco Bonaccorso, Luigi Colombo, Gianluca Fiori

    Quantum engineering entails atom-by-atom design and fabrication of electronic devices. This innovative technology that unifies materials science and device engineering has been fostered by the recent progress in the fabrication of vertical and lateral heterostructures of two-dimensional materials and by the assessment of the technology potential via computational nanotechnology. But how close are we to the possibility of the practical realization of next-generation atomically thin transistors? In this Perspective, we analyse the outlook and the challenges of quantum-engineered transistors using heterostructures of two-dimensional materials against the benchmark of silicon technology and its foreseeable evolution in terms of potential performance and manufacturability. Transistors based on lateral heterostructures emerge as the most promising option from a performance point of view, even if heterostructure formation and control are in the initial technology development stage.

    更新日期:2018-03-07
  • A frustrated solution
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-03-06
    Alberto Moscatelli

    A frustrated solution A frustrated solution, Published online: 06 March 2018; doi:10.1038/s41565-018-0100-8 A frustrated solution

    更新日期:2018-03-07
  • High-flux water desalination with interfacial salt sieving effect in nanoporous carbon composite membranes
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-03-05
    Wei Chen, Shuyu Chen, Tengfei Liang, Qiang Zhang, Zhongli Fan, Hang Yin, Kuo-Wei Huang, Xixiang Zhang, Zhiping Lai, Ping Sheng

    Freshwater flux and energy consumption are two important benchmarks for the membrane desalination process. Here, we show that nanoporous carbon composite membranes, which comprise a layer of porous carbon fibre structures grown on a porous ceramic substrate, can exhibit 100% desalination and a freshwater flux that is 3–20 times higher than existing polymeric membranes. Thermal accounting experiments demonstrated that the carbon composite membrane saved over 80% of the latent heat consumption. Theoretical calculations combined with molecular dynamics simulations revealed the unique microscopic process occurring in the membrane. When the salt solution is stopped at the openings to the nanoscale porous channels and forms a meniscus, the vapour can rapidly transport across the nanoscale gap to condense on the permeate side. This process is driven by the chemical potential gradient and aided by the unique smoothness of the carbon surface. The high thermal conductivity of the carbon composite membrane ensures that most of the latent heat is recovered.

    更新日期:2018-03-06
  • Publisher Correction: Controllable molecular motors engineered from myosin and RNA
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-03-02
    Tosan Omabegho, Pinar S. Gurel, Clarence Y. Cheng, Laura Y. Kim, Paul V. Ruijgrok, Rhiju Das, Gregory M. Alushin, Zev Bryant

    Publisher Correction: Controllable molecular motors engineered from myosin and RNA Publisher Correction: Controllable molecular motors engineered from myosin and RNA, Published online: 02 March 2018; doi:10.1038/s41565-017-0028-4 Publisher Correction: Controllable molecular motors engineered from myosin and RNA

    更新日期:2018-03-02
  • Charge splitters and charge transport junctions based on guanine quadruplexes
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-02-26
    Ruojie Sha, Limin Xiang, Chaoren Liu, Alexander Balaeff, Yuqi Zhang, Peng Zhang, Yueqi Li, David N. Beratan, Nongjian Tao, Nadrian C. Seeman

    Self-assembling circuit elements, such as current splitters or combiners at the molecular scale, require the design of building blocks with three or more terminals. A promising material for such building blocks is DNA, wherein multiple strands can self-assemble into multi-ended junctions, and nucleobase stacks can transport charge over long distances. However, nucleobase stacking is often disrupted at junction points, hindering electric charge transport between the two terminals of the junction. Here, we show that a guanine-quadruplex (G4) motif can be used as a connector element for a multi-ended DNA junction. By attaching specific terminal groups to the motif, we demonstrate that charges can enter the structure from one terminal at one end of a three-way G4 motif, and can exit from one of two terminals at the other end with minimal carrier transport attenuation. Moreover, we study four-way G4 junction structures by performing theoretical calculations to assist in the design and optimization of these connectors.

    更新日期:2018-02-27
  • Spatially controlled doping of two-dimensional SnS2 through intercalation for electronics
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-02-26
    Yongji Gong, Hongtao Yuan, Chun-Lan Wu, Peizhe Tang, Shi-Ze Yang, Ankun Yang, Guodong Li, Bofei Liu, Jorik van de Groep, Mark L. Brongersma, Matthew F. Chisholm, Shou-Cheng Zhang, Wu Zhou, Yi Cui

    Doped semiconductors are the most important building elements for modern electronic devices1. In silicon-based integrated circuits, facile and controllable fabrication and integration of these materials can be realized without introducing a high-resistance interface2,3. Besides, the emergence of two-dimensional (2D) materials enables the realization of atomically thin integrated circuits4,5,6,7,8,9. However, the 2D nature of these materials precludes the use of traditional ion implantation techniques for carrier doping and further hinders device development10. Here, we demonstrate a solvent-based intercalation method to achieve p-type, n-type and degenerately doped semiconductors in the same parent material at the atomically thin limit. In contrast to naturally grown n-type S-vacancy SnS2, Cu intercalated bilayer SnS2 obtained by this technique displays a hole field-effect mobility of ~40 cm2 V−1 s−1, and the obtained Co-SnS2 exhibits a metal-like behaviour with sheet resistance comparable to that of few-layer graphene5. Combining this intercalation technique with lithography, an atomically seamless p–n–metal junction could be further realized with precise size and spatial control, which makes in-plane heterostructures practically applicable for integrated devices and other 2D materials. Therefore, the presented intercalation method can open a new avenue connecting the previously disparate worlds of integrated circuits and atomically thin materials.

    更新日期:2018-02-27
  • Light touch
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-02-19
    Guglielmo Lanzani

    Light touch Light touch, Published online: 19 February 2018; doi:10.1038/s41565-018-0081-7 Light-responsive silicon nanowires modulate neuron activity in a non-invasive manner.

    更新日期:2018-02-21
  • Strong room-temperature ferromagnetism in VSe2 monolayers on van der Waals substrates
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-02-19
    Manuel Bonilla, Sadhu Kolekar, Yujing Ma, Horacio Coy Diaz, Vijaysankar Kalappattil, Raja Das, Tatiana Eggers, Humberto R. Gutierrez, Manh-Huong Phan, Matthias Batzill

    Reduced dimensionality and interlayer coupling in van der Waals materials gives rise to fundamentally different electronic1, optical2 and many-body quantum3,4,5 properties in monolayers compared with the bulk. This layer-dependence permits the discovery of novel material properties in the monolayer regime. Ferromagnetic order in two-dimensional materials is a coveted property that would allow fundamental studies of spin behaviour in low dimensions and enable new spintronics applications6,7,8. Recent studies have shown that for the bulk-ferromagnetic layered materials CrI3 (ref. 9) and Cr2Ge2Te6 (ref. 10), ferromagnetic order is maintained down to the ultrathin limit at low temperatures. Contrary to these observations, we report the emergence of strong ferromagnetic ordering for monolayer VSe2, a material that is paramagnetic in the bulk11,12. Importantly, the ferromagnetic ordering with a large magnetic moment persists to above room temperature, making VSe2 an attractive material for van der Waals spintronics applications.

    更新日期:2018-02-21
  • Photoelectrochemical modulation of neuronal activity with free-standing coaxial silicon nanowires
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-02-19
    Ramya Parameswaran, João L. Carvalho-de-Souza, Yuanwen Jiang, Michael J. Burke, John F. Zimmerman, Kelliann Koehler, Andrew W. Phillips, Jaeseok Yi, Erin J. Adams, Francisco Bezanilla, Bozhi Tian

    Optical methods for modulating cellular behaviour are promising for both fundamental and clinical applications. However, most available methods are either mechanically invasive, require genetic manipulation of target cells or cannot provide subcellular specificity. Here, we address all these issues by showing optical neuromodulation with free-standing coaxial p-type/intrinsic/n-type silicon nanowires. We reveal the presence of atomic gold on the nanowire surfaces, likely due to gold diffusion during the material growth. To evaluate how surface gold impacts the photoelectrochemical properties of single nanowires, we used modified quartz pipettes from a patch clamp and recorded sustained cathodic photocurrents from single nanowires. We show that these currents can elicit action potentials in primary rat dorsal root ganglion neurons through a primarily atomic gold-enhanced photoelectrochemical process.

    更新日期:2018-02-21
  • 2D MoS2 as an efficient protective layer for lithium metal anodes in high-performance Li–S batteries
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-02-12
    Eunho Cha, Mumukshu D. Patel, Juhong Park, Jeongwoon Hwang, Vish Prasad, Kyeongjae Cho, Wonbong Choi

    Among the candidates to replace Li-ion batteries, Li–S cells are an attractive option as their energy density is about five times higher (~2,600 Wh kg−1). The success of Li–S cells depends in large part on the utilization of metallic Li as anode material. Metallic lithium, however, is prone to grow parasitic dendrites and is highly reactive to several electrolytes; moreover, Li–S cells with metallic Li are also susceptible to polysulfides dissolution. Here, we show that ~10-nm-thick two-dimensional (2D) MoS2 can act as a protective layer for Li-metal anodes, greatly improving the performances of Li–S batteries. In particular, we observe stable Li electrodeposition and the suppression of dendrite nucleation sites. The deposition and dissolution process of a symmetric MoS2-coated Li-metal cell operates at a current density of 10 mA cm−2 with low voltage hysteresis and a threefold improvement in cycle life compared with using bare Li-metal. In a Li–S full-cell configuration, using the MoS2-coated Li as anode and a 3D carbon nanotube–sulfur cathode, we obtain a specific energy density of ~589 Wh kg−1 and a Coulombic efficiency of ~98% for over 1,200 cycles at 0.5 C. Our approach could lead to the realization of high energy density and safe Li-metal-based batteries.

    更新日期:2018-02-13
  • Revolving supramolecular chiral structures powered by light in nanomotor-doped liquid crystals
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-02-12
    Tetiana Orlova, Federico Lancia, Charles Loussert, Supitchaya Iamsaard, Nathalie Katsonis, Etienne Brasselet

    Molecular machines operated by light have been recently shown to be able to produce oriented motion at the molecular scale1,2 as well as do macroscopic work when embedded in supramolecular structures3,4,5. However, any supramolecular movement irremediably ceases as soon as the concentration of the interconverting molecular motors or switches reaches a photo-stationary state6,7. To circumvent this limitation, researchers have typically relied on establishing oscillating illumination conditions—either by modulating the source intensity8,9 or by using bespoke illumination arrangements10,11,12,13. In contrast, here we report a supramolecular system in which the emergence of oscillating patterns is encoded at the molecular level. Our system comprises chiral liquid crystal structures that revolve continuously when illuminated, under the action of embedded light-driven molecular motors. The rotation at the supramolecular level is sustained by the diffusion of the motors away from a localized illumination area. Above a critical irradiation power, we observe a spontaneous symmetry breaking that dictates the directionality of the supramolecular rotation. The interplay between the twist of the supramolecular structure and the diffusion14 of the chiral molecular motors creates continuous, regular and unidirectional rotation of the liquid crystal structure under non-equilibrium conditions.

    更新日期:2018-02-13
  • Continuously revolving patterns
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-02-12
    David Bléger

    Continuously revolving patterns Continuously revolving patterns, Published online: 12 February 2018; doi:10.1038/s41565-018-0076-4 Molecular motors embedded in a frustrated liquid crystal film induce the formation of sustained rotating patterns under light irradiation.

    更新日期:2018-02-13
  • Two-dimensional materials from high-throughput computational exfoliation of experimentally known compounds
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-02-06
    Nicolas Mounet, Marco Gibertini, Philippe Schwaller, Davide Campi, Andrius Merkys, Antimo Marrazzo, Thibault Sohier, Ivano Eligio Castelli, Andrea Cepellotti, Giovanni Pizzi, Nicola Marzari

    Two-dimensional (2D) materials have emerged as promising candidates for next-generation electronic and optoelectronic applications. Yet, only a few dozen 2D materials have been successfully synthesized or exfoliated. Here, we search for 2D materials that can be easily exfoliated from their parent compounds. Starting from 108,423 unique, experimentally known 3D compounds, we identify a subset of 5,619 compounds that appear layered according to robust geometric and bonding criteria. High-throughput calculations using van der Waals density functional theory, validated against experimental structural data and calculated random phase approximation binding energies, further allowed the identification of 1,825 compounds that are either easily or potentially exfoliable. In particular, the subset of 1,036 easily exfoliable cases provides novel structural prototypes and simple ternary compounds as well as a large portfolio of materials to search from for optimal properties. For a subset of 258 compounds, we explore vibrational, electronic, magnetic and topological properties, identifying 56 ferromagnetic and antiferromagnetic systems, including half-metals and half-semiconductors.

    更新日期:2018-02-07
  • My greatest experiment
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-02-05
    Ronit Satchi-Fainaro

    My greatest experiment My greatest experiment, Published online: 05 February 2018; doi:10.1038/s41565-018-0064-8 Ronit Satchi-Fainaro reflects on decision making in science and in life.

    更新日期:2018-02-06
  • Searching for materials with reduced dimension
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-02-05
    Olle Eriksson

    Searching for materials with reduced dimension Searching for materials with reduced dimension, Published online: 05 February 2018; doi:10.1038/s41565-017-0060-4 High-throughput electronic structure calculations, together with structural data-mining algorithms, allow the identification of new two-dimensional materials.

    更新日期:2018-02-06
  • Atomic recall
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-02-05
    Olga Bubnova

    Atomic recall Atomic recall, Published online: 05 February 2018; doi:10.1038/s41565-018-0074-6 Atomic recall

    更新日期:2018-02-06
  • Plastic affinity
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-02-05

    Plastic affinity Plastic affinity, Published online: 05 February 2018; doi:10.1038/s41565-018-0077-3 A new surface functionalization method opens the way towards high-performance organic electronic devices on flexible substrates.

    更新日期:2018-02-06
  • I will message you
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-02-05
    Alberto Moscatelli

    I will message you I will message you, Published online: 05 February 2018; doi:10.1038/s41565-018-0072-8 I will message you

    更新日期:2018-02-06
  • A multiplexing approach
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-02-05
    Wenjie Sun

    A multiplexing approach A multiplexing approach, Published online: 05 February 2018; doi:10.1038/s41565-018-0075-5 A multiplexing approach

    更新日期:2018-02-06
  • Direct imaging of the electron liquid at oxide interfaces
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-02-05
    Kyung Song, Sangwoo Ryu, Hyungwoo Lee, Tula R. Paudel, Christoph T. Koch, Bumsu Park, Ja Kyung Lee, Si-Young Choi, Young-Min Kim, Jong Chan Kim, Hu Young Jeong, Mark S. Rzchowski, Evgeny Y. Tsymbal, Chang-Beom Eom, Sang Ho Oh

    The breaking of symmetry across an oxide heterostructure causes the electronic orbitals to be reconstructed at the interface into energy states that are different from their bulk counterparts1. The detailed nature of the orbital reconstruction critically affects the spatial confinement and the physical properties of the electrons occupying the interfacial orbitals2,3,4. Using an example of two-dimensional electron liquids forming at LaAlO3/SrTiO3 interfaces5,6 with different crystal symmetry, we show that the selective orbital occupation and spatial quantum confinement of electrons can be resolved with subnanometre resolution using inline electron holography. For the standard (001) interface, the charge density map obtained by inline electron holography shows that the two-dimensional electron liquid is confined to the interface with narrow spatial extension (~1.0 ± 0.3 nm in the half width). On the other hand, the two-dimensional electron liquid formed at the (111) interface shows a much broader spatial extension (~3.3 ± 0.3 nm) with the maximum density located ~2.4 nm away from the interface, in excellent agreement with density functional theory calculations.

    更新日期:2018-02-06
  • A cool paper
    Nat. Nanotech. (IF 38.986) Pub Date : 2018-02-05

    A cool paper A cool paper, Published online: 05 February 2018; doi:10.1038/s41565-018-0078-2 Interdisciplinarity highlights the uniqueness of nanoscience.

    更新日期:2018-02-06
Some contents have been Reproduced with permission of the American Chemical Society.
Some contents have been Reproduced by permission of The Royal Society of Chemistry.
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