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  • Silver nanoparticles modulate lipopolysaccharide-triggered Toll-like receptor signaling in immune-competent human cell lines†
    Nanoscale Adv. Pub Date : 2020-01-15
    Anda R. Gliga; Jessica De Loma; Sebastiano Di Bucchianico; Sara Skoglund; Sandeep Keshavan; Inger Odnevall Wallinder; Hanna L. Karlsson; Bengt Fadeel
    更新日期:2020-01-15
  • Ultrahigh Photo-stable All-Inorganic Perovskite Nanocrystals and Their Robust Random Lasing
    Nanoscale Adv. Pub Date : 2020-01-15
    Xuhui Xu; Liiuli Yang; Ting Wang; Qiuhong Min; chaojie Pi; Fan Li; Xiao Yang; Kongzhai Li; Dacheng Zhou; Jianbei Qiu; Yu Xue Yu

    Photo-instability has prevented further commercialization of all-inorganic perovskite nanocrystals (NCs) in the field of high-power optoelectronic applications. Here, an accelerated process from non-luminescent Cs4PbBr6 to be CsPbBr3 NCs with bright green emission is explored with the irradiation of 365 nm during the water-triggered structural transformation. The photoelectric field provided by the photon energy of 365 nm promotes the rapid stripping of CsBr and atomic reconstruction, contributing to the production of ultrahigh photo-stable defect-free CsPbBr3 NCs. Robust emission output of the as-obtained CsPbBr3 NCs is well preserved even recorded after 160 min, moreover, a long-term stable random lasing could be achieved excited by ~800 nm femtosecond laser for at least 8.6×107 laser shots. Our results not only elucidate the photo-induced the accelerated phase transformation process of the all-inorganic perovskites, but also open up opportunities to synthesize highly stable CsPbBr3 NCs for their practical applications in photovoltaics and optoelectronics.

    更新日期:2020-01-15
  • Metasurfaces-based imaging and applications: from miniaturized optical components to functional imaging platforms
    Nanoscale Adv. Pub Date : 2020-01-15
    Dasol Lee; Junho Gwak; Trevon Badloe; Stefano Palomba; Junsuk Rho

    This review focuses on the imaging applications of metasurfaces. These optical elements provide a unique platform to control light; not only do they have a reduced size and complexity compared to conventional imaging systems but they also enable novel imaging modalities, such as functional imaging techniques. This review highlights the development of metalenses, from their basic principles, to the achievement of achromatic and tunable lenses, and metasurfaces implemented in functional optical imaging applications.

    更新日期:2020-01-15
  • Magnetic field induced uniaxial alignment of the lyotropic liquid-crystalline PMMA-grafted Fe3O4 nanoplates with controllable interparticle interaction
    Nanoscale Adv. Pub Date : 2020-01-14
    Chen Shen; Masaki Matsubara; Mizuho Yabushita; Sachiko Maki; Atsushi Muramatsu; Kiyoshi Kanie

    Magnetite (Fe3O4) nanoplates with a hexagonal platelet shape were synthesized by two steps: hydrothermal synthesis of iron(III) oxide (α-Fe2O3) nanoplates followed by wet chemical reduction of the α-Fe2O3 nanoplates. Then, poly(methyl methacrylate) (PMMA) chains were grafted onto the surface of the hexagonal Fe3O4 nanoplates (F) via surface-initiated atom transfer radical polymerization (SI-ATRP), which ensures dispersion stability in organic solvents and ionic liquids. After mixing with 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([Emim+][NTf2−]), a representative ionic liquid, the resulting PMMA-modified F were found to show good lyotropic liquid-crystalline (LC) behaviour in [Emim+][NTf2−] and to exhibit a fast response to the application of an external magnetic field. Ultra-small-angle synchrotron X-ray scattering (USAXS) measurements verified that the PMMA chain length, the weight ratio of the ionic liquid and the external magnetic field could significantly influence the interparticle distance (ID) of the PMMA-modified F in [Emim+][NTf2−]. In particular, the lyotropic LC phase could be assigned as a nematic phase with a columnar alignment. In addition, the PMMA-modified F maintained a uniaxially aligned nematic columnar structure along the magnetic field direction. Our study also determined the mechanism for the special alignment of the PMMA-modified F under an external magnetic field by analysing the growth axis, the easy magnetic axes, and the interparticle distance of F. The results suggested that the special alignment of the PMMA-modified F was affected by the interparticle interaction caused by the PMMA long chains on F under the magnetic field. Furthermore, the present study revealed that PMMA-modified F exhibited a new magnetic field responsive behaviour that led not only to the formation of a uniaxial alignment structure but also to control of ID with the help of the PMMA soft corona under the application of a magnetic field. These features could prove to be a promising advance towards novel applications of magnetic NPs, such as functional magnetic fluids, rewritable magnetic switching devices, and smart magneto-electrochemical nanosensors.

    更新日期:2020-01-15
  • 更新日期:2020-01-15
  • Mechanism of Metal Exchange in Non-metallic Nanoclusters
    Nanoscale Adv. Pub Date : 2020-01-14
    Shuxin Wang; Lin Xiong; Guodong Sun; Li Tang; Jun Zhang; Yong Pei; Manzhou Zhu

    Metal nanoclusters have been served as an emerging class of modular nanomaterials owing to their atomically precise structures, fascinating properties, and potential applications. Among the nanocluster science, the subject of nanocluster alloying represents one of the most dynamic areas and has emerged recently as a new “growth point”. The metal-exchange strategy, i.e., doping a template nanocluster with the thiolated metallic complexes as the heteroatom source, has been extensively exploited in the preparation of new alloy nanoclusters. However, the mechanism of this metal-exchange process has not been elucidated.In this work,We substituted gold atoms in fcc structured Au28 and Au36 nanoclusters with Ag(I)SR complex, and obtained AgxAu28-x and AgxAu36-x nanoclusters, respectively. The positive electrostatic potential (ESP) and dual descriptor (△f) values were calculated for the metal cores for both nanoclusters, which indicated that the metal exchange is an electrophilic reaction.

    更新日期:2020-01-14
  • The SALSAC approach: comparing the reactivity of solvent-dispersed nanoparticles with nanoparticulate surfaces†
    Nanoscale Adv. Pub Date : 2019-12-12
    Sven A. Freimann; Davood Zare; Catherine E. Housecroft; Edwin C. Constable
    更新日期:2020-01-14
  • When finite-size effects dictate the growth dynamics on strained freestanding nanomembranes.
    Nanoscale Adv. Pub Date : 2020-01-13
    Mourad Mezaguer; Nedjma Ouahioune; Jean-Noël Aqua

    We investigate the influence of strain-sharing and finite-size effects on the morphological instability of hetero-epitaxial nanomembranes made of a thin film on a thin freestanding substrate. We show that long-range elastic interactions enforce a strong dependance of the surface dynamics on geometry. The instability time-scale $\tau$ is found to diverge as $(e/H)^{-\alpha}$ with $\alpha \pe 4$ (respectively 8) in thin (resp. thick) membranes, where $e$ (resp. $H$) is the substrate (resp. nanomembrane) thickness, revealing a huge inhibition of the dynamics as strain sharing decreases the level of strain on the surface. Conversely, $\tau$ vanishes as $H^2$ in thin nano-membranes, revealing a couter-intuitive strong acceleration of the instability in thin nanomembranes. Similarly, the instability length-scale displays a power-law dependence as $(e/H)^{-\beta}$, with $\beta \pe \alpha/4$ in both the thin and thick membranes limits. These results pave the way both of experimental investigation, but also, of the dynamical control of the inescapable morphological evolution in epitaxial systems.

    更新日期:2020-01-13
  • Metal–organic framework templated Pd/CeO2@N-doped carbon for low-temperature CO oxidation†
    Nanoscale Adv. Pub Date : 2019-12-31
    Weidong Fan; Dongyuan Liu; Xia Wang; Xiuping Liu; Dongwei Cao; Lili Fan; Zhaodi Huang; Wenyue Guo; Daofeng Sun
    更新日期:2020-01-13
  • Hierarchical structure N, O co-doped porous carbon/carbon nanotubes composite derived from coal for supercapacitors and CO2 capture
    Nanoscale Adv. Pub Date : 2020-01-11
    Jian Hao; Xiu Wang; Yanxia Wang; Xiaoyong Lai; Qingjie Guo; Jiupeng Zhao; Yu Yang; Yao Li

    The energy and environmental crisis forces us to search for new green energy and develop energy storage and environmental restoration technology. Fabrication of carbon functional materials derived from coal has attracted increasing attention among the energy storage and gas adsorption fields. In this work, N, O co-doped porous carbon/carbon nanotubes composite was prepared by functionalizing coal based porous carbon with carbon nanotubes (CNTs) and ionic liquid annealing. The resulting materials not only inherited the morphology of CNTs and porous carbon, but also developed the three dimension (3D) hierarchical porous structure with numerous heteroatom groups. N, O co-doped porous carbon/CNTs composite (N, O-PC-CNTs) showed a phrase surface area of 2164 m2 g-1, and high level N/O dopants (8.0 and 3 at%). Benefiting from such merits, the N, O-PC-CNTs exhibited a rather high specific capacitance of 287 F g-1 at current densities of 0.2 A g-1, and a high rate capability (70% and 64% capacitance retention at 10 and 50 A g-1, respectively) in a three electrode system. Furthermore, N, O-PC-CNTs symmetrical supercapacitor showed a high cycling stability with 95% capacitance retention after 20, 000 cycles at 20 A g-1 and an energy density of 4.5 Wh kg-1 at a power density of 12.5 kW kg−1 in 6 mol L-1 KOH electrolyte. As CO2 adsorbents, N, O-PC-CNTs exhibited a high CO2 uptake of 5.7 and 3.7 mmol g−1 at 1 bar, at 273 and 298 K, respectively. Moreover, N, O-PC-CNTs showed cycle stability with 94% retention of the initial CO2 adsorption capacity at 298 K over 10 cycles. This report introduces a strategy to design coal based porous carbon for efficient supercapacitor electrodes and CO2 adsorbents.

    更新日期:2020-01-13
  • Interdependence of charge and secondary structure on cellular uptake of cell penetrating peptide functionalized silica nanoparticles†
    Nanoscale Adv. Pub Date : 2019-12-09
    Isabel Gessner; Annika Klimpel; Merlin Klußmann; Ines Neundorf; Sanjay Mathur
    更新日期:2020-01-13
  • Transparent conductive oxides in photoanodes for solar water oxidation
    Nanoscale Adv. Pub Date : 2020-01-10
    Yuanxing Fang; Daniel Commandeur; Wei Cheat Lee; Qiao Chen
    更新日期:2020-01-10
  • Understanding the role of zinc dithiocarbamate complexes as single source precursors to ZnS nanomaterials
    Nanoscale Adv. Pub Date : 2020-01-09
    Graeme Hogarth; Husn Islam; Anna Roffey; Nathan Hollingsworth; Gopinathan Sankar; Nora Henriette De Leeuw; Wim Bras

    Zinc sulfide is an important wide-band gap semi-conductor and dithiocarbamate complexes [Zn(S2CNR2)2] find widespread use as single-source precursors for the controlled synthesis of ZnS nanoparticulate modifications. Decomposition of [Zn(S2CNiBu2)2] (2) in oleylamine gives high aspect ratio wurtzite nanowires, the average length of which was increased upon addition of thiuram disulfide to the decomposition mixture. To provide further insight into the decomposition process, X-ray absorption spectroscopy (XAS) of [Zn(S2CNMe2)2] (1) was performed in the solid-state, in non-coordinating xylene and in oleylamine. In the solid-state, dimeric [Zn(S2CNMe2)2]2 was characterised in accord with the single crystal X-ray structure, while in xylene this breaks down into tetrahedral monomers. In situ XAS in oleylamine (RNH2) shows that the coordination sphere is further modified, amine binding to give five-coordinate [Zn(S2CNMe2)2(RNH2)]. This species is stable to ca. 70 oC, above which amine dissociates and at ca. 90 oC decomposition occurs to generate ZnS. The relatively low temperature onset of nanoparticle formation is associated with amine-exchange leading to the in situ formation of [Zn(S2CNMe2)(S2CNHR)] which has a low temperature decomposition pathway and combining these observations with the previous work of others allows us to propose a detailed mechanistic scheme for the overall process.

    更新日期:2020-01-09
  • Isolation methods for particle protein corona complexes from protein-rich matrices
    Nanoscale Adv. Pub Date : 2020-01-09
    Linda Böhmert; Linn Voss; Valerie Stock; Albert Braeuning; Alfonso Lampen; Holger Sieg

    Background: Nanoparticles get rapidly encased by a protein layer when they are in contact with biological fluids. This protein shell is called corona. The composition of the corona has a strong influence on the surface properties of the nanoparticles. It can affect their cellular interactions, uptake and signaling properties. For this reason, protein coronae are investigated frequently as an important part of particle characterization. Main body of the abstract: The protein corona can be analyzed by different methods, which have their individual advantages and challenges. The separation techniques to isolate corona-bound particles from the surrounding matrices include centrifugation, magnetism and chromatographic methods. Different organic matrices, such as blood, blood serum, plasma or differently complex protein mixtures are used and the approaches vary in parameters such as time, concentration and temperature. Depending on the investigated particle type, the choice of the separation method can be crucial for the subsequent results. In addition, it is important to include suitable controls to avoid misinterpretation and false-positive or false-negative results, thus allowing to obtain a valuable protein corona analysis. Conclusion: Protein corona studies are an important part of particle characterization in biological matrices. This review gives a comparative overview about separation techniques, experimental parameters and challenges which occur during the investigation of the protein coronae of different particle types.

    更新日期:2020-01-09
  • Observation of Critical Magnetic Behavior in 2D Carbon based composites
    Nanoscale Adv. Pub Date : 2020-01-09
    Vineeta Shukla

    Two dimensional (2D) carbonaceous materials such as graphene and its derivative, e.g., graphydine have enormous potential probability in the major field of scientific research. Theoretically, it has been proposed that the perfect atomic lattice arrangement of these materials is responsible for their outstanding physical and chemical properties even though for poor magnetic properties. Experimentally, it is difficult to obtain the perfect atomic lattice of carbon atom due to the appearance of structural disorders. These structural disorders are generated during the growth or synthesis of carbon-related materials. Investigation of structural disorder reveals that these have some advantages and disadvantages depending on the application. For instance, this disorder reduces the thermal, mechanical stability, and deteriorate the performance of 2D carbon-based electronics devices. While the most interesting role of the structural disorder can be seen in the field of magnetism. Disorders not only create the magnetic ordering within 2D carbon materials but also influence the local electronic structure that opens up the door for future spintronics devices. Although various studies on disorder induced magnetism of 2D carbon materials are available in the literature, still some part of the above field has not been fully exploited. This review presents at putting existing work for the future development of 2D carbon-based devices.

    更新日期:2020-01-09
  • A highly reliable, impervious and sustainable triboelectric nanogenerator as a zero-power consuming active pressure sensor†
    Nanoscale Adv. Pub Date : 2020-01-09
    Venkateswaran Vivekananthan; Arunkumar Chandrasekhar; Nagamalleswara Rao Alluri; Yuvasree Purusothaman; Sang-Jae Kim
    更新日期:2020-01-09
  • Photo/thermo-responsive and size-switchable nanoparticles for chemo-photothermal therapy against orthotopic breast cancer†
    Nanoscale Adv. Pub Date : 2019-12-17
    Ying Bi; Miao Wang; Lirong Peng; Lifo Ruan; Mengxue Zhou; Yi Hu; Jun Chen; Jimin Gao
    更新日期:2020-01-09
  • A self-encapsulated broadband phototransistor based on a hybrid of graphene and black phosphorus nanosheets†
    Nanoscale Adv. Pub Date : 2019-12-20
    Guigang Zhou; Zhongjun Li; Yanqi Ge; Han Zhang; Zhenhua Sun
    更新日期:2020-01-09
  • Preparation of a Ti0.7W0.3O2/TiO2 nanocomposite interfacial photocatalyst and its photocatalytic degradation of phenol pollutants in wastewater†
    Nanoscale Adv. Pub Date : 2019-12-12
    Zemin Dong; Rendan Zhou; Leyan Xiong; Han Li; Qiang Liu; Longzhen Zheng; Zanru Guo; Zhaoxiang Deng
    更新日期:2020-01-09
  • A Novel Application of Nanoporous Gold to Humidity Sensing: A Framework for a General Volatile Compound Sensor
    Nanoscale Adv. Pub Date : 2020-01-08
    Timothy Wong; Roger Newman

    Volatile organic compounds (VOC) are ubiquitous in industrial applications creating a pressing desire for novel transduction pathways to build a broad family of new gas sensors. Nanoporous gold (NPG) is a material with a vast range of untapped potential applications; offering a high surface area found generally in nanomaterials, while also being comparatively simple to fabricate. NPG based sensors can also leverage the unique physics of gold at the nanoscale. In this work, we leverage the multiple unique nanoscale phenomena associated with NPG to demonstrate two novel transduction mechanisms to sense humidity, a model compound. Through direct electrical measurements of NPG, we were able to sense changes in the electronic properties of NPG induced by ambient humidity. We propose two novel transduction mechanisms: chemoresisitive changes induced by surface adsorption and electrochemical capacitive changes induced by the electric double layer to detect humidity. To our knowledge this is the first reported application of both these mechanisms for sensing any volatile compounds utilizing NPG.

    更新日期:2020-01-08
  • 更新日期:2020-01-08
  • 更新日期:2020-01-08
  • Revealing the Pulmonary Surfactant Corona on Silica Nanoparticles by Cryo-Transmission Electron Microscopy
    Nanoscale Adv. Pub Date : 2020-01-07
    Fanny Mousseau; Evdokia Oikonomou; Annie Vacher; Marc Airiau; Stéphane Mornet; Jean-Francois Berret

    When inhaled nanoparticles (NPs) deposit in alveoli, they transit through the pulmonary surfactant (PS), a biofluid made of proteins and phospholipidic vesicles. They acquire a corona reflecting the PS-nanomaterials interaction. Since the corona determines directly the NPs biological fate, the question of its nature and structure is central. Here, we report on the corona architecture raising after incubation of positive or negative silica particles with Curosurf®, a biomimetic pulmonary surfactant of porcine origin. Using optical, electron and cryo-electron microscopy, we determine the pulmonary surfactant corona structure at different scales of observation. Contrary to common belief, the PS corona is not only constituted by phospholipidic bilayers surrounding NPs but by multiple hybrid structures derived from NPs-vesicles interaction. Statistical analysis of cryo-TEM images provides interesting highlights about the nature of the corona depending on the particle charge. The influence of Curosurf® pre- or post-treatment is also investigated and demonstrate the need of protocols standardization.

    更新日期:2020-01-07
  • Gold behaves as hydrogen? A joint theoretical and experimental study
    Nanoscale Adv. Pub Date : 2020-01-07
    Zhengbo Qin; Jiangle Zhang; Chen Wang; Lin Wang; Zichao Tang

    It has been established that noble-metal-H analogue has been found in a large number of noble-metal-ligand clusters in view of geometric and electronic structures. Here, we demonstrated different view of noble-metal-H analogue between noble-metal and hydrogen in M(SCH3)2- (M = Cu, Ag, Au and H) systems. Although as we all know, H(SCH3)2- is typical ion-hydrogen bonding cluster dramatically different from the chemical bonding nature in clusters of M(SCH3)2- (M = Cu, Ag and Au), the comparison of the two typical bonding patterns has not yet been fully investigated. Through a series of chemical bonding analyses, it is indicated that the evolution has been exhibited from typically ionic bonding in Cu(SCH3)2- to significantly covalent bonding nature in Au(SCH3)2- and hydrogen bonding dominates in H(SCH3)2-. The comparison of M(SCH3)2- (M = Cu, Ag and Au) with H(SCH3)2- illustrates the differences in bonding between noble-metal and hydrogen, which are mainly related to their diverse atomic orbitals participating in chemical bonding.

    更新日期:2020-01-07
  • Optical signatures of single ion tracks in ZnO†
    Nanoscale Adv. Pub Date : 2019-12-23
    G. C. Vásquez; K. M. Johansen; A. Galeckas; L. Vines; B. G. Svensson
    更新日期:2020-01-07
  • Novel strategy to design multilayer functionalized Cu2S thin film counter electrode with enhanced catalytic activity and stability for quantum dot sensitized solar cells
    Nanoscale Adv. Pub Date : 2020-01-06
    Libin Wu; Zhengmeng Lin; Pengyu Feng; Liping Luo; Lanlan Zhai; Fantai Kong; Yun Yang; Lijie Zhang; Shaoming Huang; Chao Zou

    As the essential component of quantum dot-sensitized solar cell (QDSC), counter electrode (CE) plays an important role in electron transfer and catalytic reduction acquisition throughout the device. A novel route to design multilayer functionalized Cu2S thin films as CE with high catalytic activity and enhanced stability is presented, as well as large specific surface area and high conductivity. Firstly, Mo-based films was prepared by magnetron sputtering on the glass substrate, and then porous CuZnMo conductive films were formed by etching with hydrochloric acid. Secondly, indium tin oxide (ITO) film was sputtered onto the porous structure to act as a protective layer, and a porous ITO/CuZnMo structured film was obtained after optimization. In the third step, multilayer Cu(x)/ITO/CuZnMo structured films were acquired by sputtering Cu films. Finally, multilayer Cu2S(t)/ITO/CuZnMo functionalized film CEs were obtained via in-situ sulfidation of sputtered Cu films. The function of conduction and resistance to electrolyte corrosion were conducted and enhanced by annealing ITO layer at high temperature prior to Cu deposition, while catalytic activity enabled by Cu2S were realized from Cu films sulfidation. The multilayer Cu2S/ITO(500°C)/CuZnMo functionalized films exhibit high catalytic activity and enhanced stability for resistance to electrolyte corrosion. Taking multilayer Cu2S/ITO(500°C)/CuZnMo films as CE, The QDSCs demonstrated good stability of power conversion efficiency (PCE) after 500 h irradiation, from the initial 4.21% to the final 4.00%. Furthermore, the thickness of Cu2S film modulated by the time of Cu sputtering were investigated. It was found that the QDSCs using multilayer Cu2S(40 min)/ITO/CuZnMo functionalized film with Cu2S thickness of 1.2 μm as CE exhibits the best performance, and the Rct value was 0.57 Ω. The best photovoltaic performance with PCE of 5.21% (Voc=533.1 mV, Jsc=18.80 mA·cm-2, FF=52.84%) was achieved under AM 1.5 radiation with an incident power of 100 mW·cm-2. This design of multilayer functionalized CE introduces potential alternatives to the common brass-based CE for long-term QDSCs with high performance.

    更新日期:2020-01-06
  • Two-dimensional metal organic frameworks and their derivatives for electrochemical energy storage and electrocatalysis
    Nanoscale Adv. Pub Date : 2020-01-06
    Kuangmin ZHAO; Weiwei Zhu; Suqin Liu; Xianli Wei; Guanying Ye; Yuke Su; Zhen He

    The two-dimensional (2D) metal-organic frameworks (MOFs) and their derivatives with excellent dimension-related properties, e.g. high surface areas, abundantly accessible metal nodes, and tailorable structures, have attracted intensive attention as energy storage materials and electrocatalysts. A major challenge on the road toward the commercialization of the 2D MOFs and their derivatives is to achieve facile and controllable synthesis of the 2D MOFs with a high quality and at a low cost. Significant developments have been made in the synthesis and applications of the 2D MOFs and their derivatives in recent years. In this review, we first discuss the state-of-the-art synthetic strategies (including both the top-down and bottom-up approaches) for the 2D MOFs. Subsequently, we review the most recent application progresses of the 2D MOFs and their derivatives in the fields of electrochemical energy storage (e.g., batteries and supercapacitors) and electrocatalysis (of classical reactions such as HER, OER, ORR, and CO2RR). Finally, the challenges and promising strategies for the synthesis and applications of the 2D MOFs and their derivatives are addressed for the future development.

    更新日期:2020-01-06
  • Electro-synthesized Co(OH)2@CoSe with Co-OH Active Sites for Overall Water Splitting Electrocatalysis
    Nanoscale Adv. Pub Date : 2020-01-06
    Yin Wang; Yutong Yang; Xia Wang; Hongyang Shao; Pei-He Li; Tianen Li; Haiyang Liu; Qingfu Zheng; Jing Hu; Limei Duan; Changwen Hu; Jinghai Liu

    Constructing noble metal-free electrocatalytic active site for simultaneous hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline solution is key to realizing electricity-driven water splitting in practical application. Here, we rationally designed Co(OH)2@CoSe nanorods (NRs) as an excellent bifunctional electrocatalyst by in-situ electrochemical transformation strategy, where the Co-based nanorod template was converted into Co(OH)2@CoSe at the cathode. The obtained electrode exhibits superior electrocatalytic activity for both HER (overpotential 208 mV at 20 mA cm-2) and OER (268 mV at 20 mA cm-2) at high current density in 1 M KOH solution. The theoretical calculations and experimental evidences indicate that the chemical coupling Co-OH active site between Co(OH)2 and CoSe regulates the hydrogen adsorption and desorption energy and fast electron transfer capability, which is responsible for improved HER. Moreover, the Co(OH)2@CoSe NRs can be further converted into CoOOH nanosheets as OER active site. Toward practical electroytic cell application, the Co(OH)2@CoSe nanorods as both cathode and anode achieved a current density of 100 mA cm-2 at 1.94 V for overall water splitting, better than noble metal-based electrocatalysis.

    更新日期:2020-01-06
  • Probing the local structure of nanoscale actinide oxides: a comparison between PuO2 and ThO2 nanoparticles rules out PuO2+x hypothesis†
    Nanoscale Adv. Pub Date : 2019-11-27
    Laura Bonato; Matthieu Virot; Thomas Dumas; Adel Mesbah; Elodie Dalodière; Oliver Dieste Blanco; Thierry Wiss; Xavier Le Goff; Michael Odorico; Damien Prieur; André Rossberg; Laurent Venault; Nicolas Dacheux; Philippe Moisy; Sergey I. Nikitenko
    更新日期:2020-01-06
  • Universal DNA detection realized by peptide based carbon nanotube biosensors†
    Nanoscale Adv. Pub Date : 2019-11-21
    Wenjun Li; Yubo Gao; Jiaona Zhang; Xiaofang Wang; Feng Yin; Zigang Li; Min Zhang
    更新日期:2020-01-06
  • Synergic effect of decoration of Nickel Oxide nanoparticles on Silicon for enhanced electrochemical performance in LIBs
    Nanoscale Adv. Pub Date : 2020-01-06
    Ujjwala V. Kawade; Sunil R Kadam; Milind V Kulkarni; Bharat B Kale

    An utmost effort is continued for the architecture of anode materials with high specific capacity and long cycling stability for lithium-ion batteries (LIBs). In this context, silicon has been preferred due to its high capacity though it has been suffered by excessive volume expansion during electrochemical reactions as well as poor cyclability due to reduction in conductivity. Hence hybridization of silicon with apt materials could be the significant approach to overcome the above problems. Therefore, demonstrated uniform decoration of nickel oxide (NiO) nanoparticles (15-20nm) on silicon nanosheets using Bis(cyclopentadienyl) nickel(II) (C10H10Ni) at low temperature taking advantage of presence of two unpaired electron in an antibonding orbital in cyclopentadienyl group. The formation and growth mechanism has been discussed in detail. The electrochemical study of nanocomposite exhibits an initial delithiation capacity, 2507mAhg−1 with reversible capacity 2162 mAhg−1 having 86% retention and better cycling stability up to 500 cycles. At optimum concentration, NiO nanoparticles facilitate the Li ion adsorptions which in turn accelerate the transport of Li+ ions to active sites of silicon. Warburg coefficient and Li ion diffusion of electrodes confirms the enhancement in charge transfer process at the electrode/electrolyte interface with NiO nanoparticles. Further, the NiO nanoparticles with a uniform distribution suppress the agglomeration of Si nanosheets and provide sufficient space to accommodate a volume change of Si during cycling which also reduces diffusion length path of the Li ions. It also helps to strengthen mechanical stability which might be helping to prevent cracking of silicon due to volume expansion and maintains the Li ion transport pathway of the active material, resulting in enhanced cycling stability. Due to the synergic effect between NiO nanoparticles and Si sheet, nanocomposite delivers high reversible capacity.

    更新日期:2020-01-06
  • Two-dimensional Bi2Se3 nanosheets based flexible infrared photodetector with pencil-drawn graphite electrodes on paper
    Nanoscale Adv. Pub Date : 2020-01-04
    Shengqian Liu; Zongyu Huang; Hui Qiao; Rong Hu; Qian Ma; Kai Huang; Hongxing Li; Xiang Qi

    Flexible optoelectronics devices are of great significance in recent years, owing to their extensive commercial and military applications. However, the manufacturing processes of most existing flexible photodetectors are particularly complicated and expensive. Employing a facile and low cost way for constructing high performance flexible infrared photodetector is one of effective strategies to facilitate its practical applications. Pencil-drawn is popular method in novel electronic and optoelectronic devices, which is resulted from low cost and facile fabrication process. Herein, we report a novel flexible infrared photodetector using liquid-exfoliated Bi2Se3 nanosheets as light sensitive material, pencil-drawn graphite as electrodes, and paper as substrate, respectively. The as-fabricated photodetector exhibits high photocurrent, excellent responsivity and long-term stability under 1064 nm infrared light irradiation. In addition, as the pencil-drawn photodetector is made of flexible paper substrate, it also well behaves the stability and durability under the bending condition. This work is proposed to be a route to construct a novel flexible infrared photodetector with facile manufacturing process and low cost.

    更新日期:2020-01-04
  • Boron nitride aerogels consisting of varied superstructures†
    Nanoscale Adv. Pub Date : 2019-12-16
    Jingjing Pan; Jingyang Wang
    更新日期:2020-01-04
  • The detection and identification of dengue virus serotypes with quantum dot and AuNP regulated localized surface plasmon resonance†
    Nanoscale Adv. Pub Date : 2019-12-13
    Ankan Dutta Chowdhury; Kenshin Takemura; Indra Memdi Khorish; Fahmida Nasrin; Mya Myat Ngwe Tun; Kouichi Morita; Enoch Y. Park
    更新日期:2020-01-04
  • Charge Transfer between Lead Halide Perovskite Nanocrystals and Single Walled Carbon Nanotubes
    Nanoscale Adv. Pub Date : 2020-01-02
    Parul Bansal; Xiangtong Zhang; Hua Wang; Prasenjit Kar; William Yu

    Charge transfer study between lead halide-based perovskite nanocrystals and single walled carbon nanotubes (PNC@CNT nanocomposite) was performed. Solution processed MAPbX3 PNCs were very bright in luminescence but quenching happened with the presence of CNTs. This change is attributed to the electron transfer from PNCs to CNTs. The detailed change in fluorescence lifetime was investigated through time correlated single photon counting (TCSPC), suggesting mixed static and dynamic quenching along with decrease in lifetime. Morphological change was investigated by transmission electron microscopy (TEM) and it is attributed to the incorporation of PNCs on long CNTs. Also, PNC@CNT nanocomposite was explored for photoinduced current response which indicated ~3 fold increase in photoconductivity under light illumination (with a 1 mV bias). This electron transfer study between PNCs and CNTs helps in exploring charge dynamics.

    更新日期:2020-01-02
  • Diatom frustules enhancing the efficiency of gel polymer electrolyte based dye-sensitized solar cells with multilayer photoelectrodes
    Nanoscale Adv. Pub Date : 2019-12-18
    T. M. W. J. Bandara; M. Furlani; I. Albinsson; Angela Wulff; B.-E. Mellander
    更新日期:2020-01-02
  • Enhanced strength of nano-polycrystalline diamond by introducing boron carbide interlayers at the grain boundaries†
    Nanoscale Adv. Pub Date : 2019-12-09
    Bo Zhao; Shengya Zhang; Shuai Duan; Jingyan Song; Xiangjun Li; Bingchao Yang; Xin Chen; Chao Wang; Wencai Yi; Zhixiu Wang; Xiaobing Liu
    更新日期:2020-01-02
  • 更新日期:2020-01-02
  • The non-stationary case of the Maxwell-Garnett theory: growth of nanomaterials (2D gold flakes) in solution†
    Nanoscale Adv. Pub Date : 2019-12-04
    Prakash Natarajan; Awad Shalabny; Sumesh Sadhujan; Ahmad Idilbi; Muhammad Y. Bashouti
    更新日期:2020-01-02
  • γ-Alumina-supported Pt17 cluster: controlled loading, geometrical structure, and size-specific catalytic activity for carbon monoxide and propylene oxidation†
    Nanoscale Adv. Pub Date : 2019-12-03
    Yuichi Negishi; Nobuyuki Shimizu; Kanako Funai; Ryo Kaneko; Kosuke Wakamatsu; Atsuya Harasawa; Sakiat Hossain; Manfred E. Schuster; Dogan Ozkaya; Wataru Kurashige; Tokuhisa Kawawaki; Seiji Yamazoe; Shuhei Nagaoka
    更新日期:2020-01-02
  • 更新日期:2020-01-02
  • Optimization of gold-palladium core-shell nanowires towards H2O2 reduction by adjusting shell thickness
    Nanoscale Adv. Pub Date : 2019-12-31
    Yongdi Dong; Qiaoli Chen; Xiqing Cheng; Huiqi Li; Jiayu Chen; Xibo Zhang; Qin Kuang; Zhaoxiong Xie

    Designable bimetallic core-shell nanoparticles have superb performance in many fields including industry catalysis, energy conversion and chemical sensing, due to their outstanding properties associated with tunable electronic structure. Herein, Au-Pd core−shell (AurichPd@AuPdrich) nanowires (NWs) were synthesized through one-pot facial chemical reduction method in presence of cetyltrimethyl ammonium bromide (CTAB) surfactant. The thickness of Pd shell could be adjusted by directly controlling the Au/Pd feeding ratio while maintaining the nanowire morphology. The as-obtained Au75Pd25 core-shell NWs with thin Pdrich shell showed significantly enhanced activities towards the reduction of hydrogen peroxide with sensitivity reaching 355 A cm-2 mM-1 and linear range from 1 to 10 mM. In sum, Pd shell thickness could be used to adjust the electronic structure, thereby optimizing the catalytic activity.

    更新日期:2019-12-31
  • Thermal deformation of gold nanostructures and its influence on surface plasmon resonance sensing
    Nanoscale Adv. Pub Date : 2019-12-27
    Hyun-Tae Kim; Mayank Pathak ; Keshav Rajasekaran ; Ashwani Gupta; Miao Yu

    Plasmonic nanostructures have been recently used in elevated temperature applications such as sensing of high-energy systems and localized heat generation for heat-assisted magnetic recording, thermophotovaltaics, and photothermal therapy. However, plasmonic nanostructures exposed to elevated temperature often experience permanent deformations, which could significantly degrade performance of the plasmonic devices. Therefore, understanding of thermal deformation of plasmonic nanostructures and its influence on the device performance is essential to the development of robust high-performance plasmonic devices. Here, we report thermal deformation of lithographic planar gold nanopatch and nanohole arrays and its influence on surface plasmon resonance sensing. The gold nanostructures are fabricated on a silicon substrate and on the end-face of an optical fiber using electron-beam lithography and focused-ion-beam lithography, respectively. The fabricated gold nanostructures are exposed to cyclic thermal loading in the range of 25 °C to 500 °C. Through experimental and numerical studies, we investigate (i) thermal deformation modes of the gold nanostructures, (ii) influence of the gold nanostructure geometry on the degree and mechanism of the thermal deformation, and (iii) influence of the thermal deformation on performance of surface plasmon resonance sensing. The obtained understanding from these studies is expected to help guide the development of robust high-performance plasmonic sensors for monitoring in elevated temperature environments. Although the current work is focused on gold nanostructures, it can be extended to provide useful insights on thermal deformation of refractory plasmonic nanostructures at extreme temperature.

    更新日期:2019-12-27
  • Nanostructured Metal Chalcogenides Confined in Hollow Structures for Promoting Energy Storage
    Nanoscale Adv. Pub Date : 2019-12-26
    Jianchun Bao; Ying Liu; Zhiwen Che; Xuyun Lu; Xiaosi Zhou; Min Han; Zhihui Dai

    The engineering of progressive nanostructures with subtle construction and abundant active sites is a key factor for the advance of highly efficient energy storage devices. Nanostructured metal chalcogenides confined in hollow structures possess abundant electroactive sites, more ions and electron pathways, high local conductivity, as well as large interior free space in a quasi-closed structure, thus show promising prospects for boosting energy-related applications. This review focuses on the most recent progress in the creation of diverse confined hollow metal chalcogenides (CHMCs), and their electrochemical applications. Particularly, by highlighting certain typical examples from these works, some deep understandings on the formation mechanism of confined hollow structures and the decisive role of microstructure engineering to related performances are discussed and analyzed, aiming at prompting the nanoscale engineering and conceptual design of some advanced confined metal chalcogenides nanostructures. This will appeal to not only the chemistry-, energy-, and materials-related field, but also the environmental protection and nanotechnology, thus open up new opportunities for applications of CHMCs in various fields, such as catalysis, adsorption and separation, and energy conversion and storage.

    更新日期:2019-12-27
  • 更新日期:2019-12-23
  • NiS2 nanoparticles anchored on open carbon nanohelmets as an advanced anode for lithium-ion batteries†
    Nanoscale Adv. Pub Date : 2019-12-13
    D. D. Yang; M. Zhao; R. D. Zhang; Y. Zhang; C. C. Yang; Q. Jiang
    更新日期:2019-12-23
  • In-plane anisotropic electronics based on low-symmetry 2D materials: progress and prospects
    Nanoscale Adv. Pub Date : 2019-12-06
    Siwen Zhao; Baojuan Dong; Huide Wang; Hanwen Wang; Yupeng Zhang; Zheng Vitto Han; Han Zhang
    更新日期:2019-12-23
  • Magnetic biomaterials and nano-instructive tools as mediators of tendon mechanotransduction
    Nanoscale Adv. Pub Date : 2019-12-05
    Ana M. Matos; Ana I. Gonçalves; Alicia J. El Haj; Manuela E. Gomes
    更新日期:2019-12-23
  • 更新日期:2019-12-23
  • A near infrared dye-coated silver nanoparticle/carbon dot nanocomposite for targeted tumor imaging and enhanced photodynamic therapy†
    Nanoscale Adv. Pub Date : 2019-12-11
    Rongjun Liu; Zhengmin Yang; Liangliang Zhang; Jingjin Zhao; Cheng Hou; Shulin Zhao
    更新日期:2019-12-19
  • 更新日期:2019-12-19
  • 更新日期:2019-12-19
  • Three dimensional Ni3S2 nanorod arrays as multifunctional electrodes for electrochemical energy storage and conversion applications†
    Nanoscale Adv. Pub Date : 2019-11-22
    Kexin Cui; Jincheng Fan; Songyang Li; Moukaila Fatiya Khadidja; Jianghong Wu; Mingyu Wang; Jianxin Lai; Hongguang Jin; Wenbin Luo; Zisheng Chao
    更新日期:2019-12-19
  • Simultaneous detection of eight biomarkers on a novel strip for early diagnosis of acute myocardial infarction
    Nanoscale Adv. Pub Date : 2019-12-17
    Nongyue He; Li Huang; Enben Su; Yuan Liu; yan deng; Lian Jin; zhu chen; Song Li; Yongxiang Zhao; Yuanchang Zhang

    Accurate detection of markers in human serum is important in the early diagnosis of acute myocardial infarction (AMI). This work presents a novel eight biomarkers strip, which combines dry chemistry with fluorescence lateral flow assay. Eight AMI markers were employed simultaneously for the sensitive detection, including cholesterol (TC), triglyceride (TG), high density lipoprotein cholesterol (HDL-C) and low density lipoprotein cholesterol (LDL-C), uric acid (UA), myoglobin (Myo), creatine kinase-MB (CK-MB), and cardiac troponin I (cTnI). The strip offers the advantages of simple fabrication, convenience, time-saving detection and accurate assessment for AMI. Moreover, the strip possesses acceptable applicability in human serum. This proposed strategy establishes a remarkable platform for the construction of a multi-tragets detection strip that is feasible for accurate detection for real human serum samples.

    更新日期:2019-12-18
  • The phase composition, morphology and compressibility of graphene–zirconia composite nanostructured powder
    Nanoscale Adv. Pub Date : 2019-12-17
    E. A. Trusova; D. D. Titov; A. N. Kirichenko; E. V. Shelekhov; N. S. Trutnev; A. M. Afzal; I. A. Perezhogin
    更新日期:2019-12-18
  • Shape- and size dependent piezoelectric properties of monolayer hexagonal boron nitride nanosheets
    Nanoscale Adv. Pub Date : 2019-12-09
    Yang Nan; Dan Tan; Junqi Zhao; Morten Willatzen; Zhong Lin Wang
    更新日期:2019-12-18
  • Nanoscale lipid vesicles functionalized with a nitro-aniline derivative for photoinduced nitric oxide (NO) delivery†
    Nanoscale Adv. Pub Date : 2019-11-20
    Nancy Sharma; Ajay Kumar Dhyani; Srujan Marepally; D. Amilan Jose
    更新日期:2019-12-18
  • Controlled assembly of artificial 2D materials based on the transfer of oxo-functionalized graphene†
    Nanoscale Adv. Pub Date : 2019-11-19
    Marleen Hußmann; Benjamin Weintrub; Patrick Feicht; Gregor Germer; Jan N. Kirchhof; Kirill I. Bolotin; Siegfried Eigler
    更新日期:2019-12-17
  • Spatial focusing of magnetic particle hyperthermia
    Nanoscale Adv. Pub Date : 2019-11-25
    Eirini Myrovali; Nikos Maniotis; Theodoros Samaras; Makis Angelakeris
    更新日期:2019-12-17
  • AgBiS2 as a Low-Cost and Eco-Friendly All-Inorganic Photovoltaic Material: Nanoscale Morphology-Property Relationship
    Nanoscale Adv. Pub Date : 2019-12-12
    Minggang Ju; Jun Dai; Liang Ma; Yuanyuan Zhou; Xiao Cheng Zeng

    Solar cells made of low-cost solution-processed all-inorganic materials are promising alternative to the conventional solar cells made of high-temperature processed inorganic materials, especially in view that many high-temperature processed inorganic materials contain toxic element(s) such as lead or cadmium (e.g., CsPbI3 perovskite, PbS, CdTe and CdS(Se)). AgBiS2 nanocrystals, consisting of earth-abundant elements but without lead and cadmium, have already emerged as promising candidate in high-performance solar cells. However, the nanoscale morphology-optoelectronic property relationship for AgBiS2 nanocrystals is still largely unknown. Herein, we investigate electronic property of various AgBiS2 nanocrystals by using first-principles computation. We show that the optoelectronic property of bulk AgBiS2 is highly dependent on the M-S-M-S- (M: Ag or Bi) orderings. Moreover, because Ag-S-Ag-S- and Bi-S-Bi-S- in AgBiS2 bulk crystal contribute respectively to the valence band maximum and conduction band minimum, these unique chemical orderings actually benefit easy separation of the mobile electrons and holes for photovoltaic application. More importantly, we find that AgBiS2 nanocrystals (NCs) can exhibit markedly different optoelectronic properties, depending on the stoichiometry. NCs with minor off-stoichiometry give rise to mid-gap states, whereas NCs with substantial off-stoichiometry give rise to many deep defect states in the band gap, and some NCs even show metallic-like electronic behavior. We also find that the deep-defect states can be removed through ligand passivation with optimal coverage. The new insights into nanoscale morphology-optoelectronic property relationship offers a rational design strategy to engineer the band alignment of AgBiS2 NC layers while address some known challenging issues inherent in the all-inorganic photovoltaic materials.

    更新日期:2019-12-13
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