In this paper we present a study on electron states in a double quantum well wire with asymmetrical barriers, also emission spectra are analyzed for a process of electron Raman scattering in this system, for which we calculate the differential cross section. The model we use considers the system to be at a temperature of T=0K and the presence of a single electron in the conduction band. In addition

A wideband metasurface absorber covering the visible to ultraviolet (UV) region (340 THz to 1150 THz) is numerically presented in this paper. The topmost layer consists of a periodic metallic array of L-shaped metasurface followed by a dielectric layer and thick metallic substrate. The nanostructure L-shaped metasurface array made up of tungsten material is used to enhance absorption spectra in the

Cu1-xFexO (x = 0, 2, 4, and 6 at. %) thin films were deposited on fluorine-doped tin oxide (FTO) substrates using the electrophoretic deposition (EPD) technique. Before the EPD process, Cu1-xFexO powders were synthesized using the solid-state method. In this method, the powders are mechanically milled up to 9 h followed by annealing at 450 °C for 2 h. The XRD patterns reveal that all the investigated

In this paper, we present the results of a detailed computational study of the structural, electronics, optical, thermodynamic, and thermoelectric properties of the AgXO2 (X = In, Y) materials with delafossite-type structure, by using the “full-potential linearized augmented plane wave (FP-LAPW)" method. The calculated structural parameters of the title compounds are in excellent agreement with the

Ge nanocrystals (GeNCs) embedded in SiO2 matrix were prepared by co-sputtering method and heat treatment. The formation of the GeNCs were confirmed by X-ray diffraction and Raman spectroscopy. Photon absorbance recordedly increased with the increased Ge content, being in consistent with the results shown in the transient induced absorption measurements. The direct transitions between Γ and L points

The optoelectronics and spectroscopic properties of N, N-diphenyl-N, N-bis(3-methylphenyl)-1, 1-biphenyl-4.4 diamine: tris (8-hydroxyquinolinate) aluminum (TPD:Alq3) systems were investigated for the application of ultraviolet (UV) sensors. Solution processed spin coating technique was used to deposit the films on quartz and to fabricate the devices on ITO-integrated substrates. Results showed that

Aiming to test whether the polynomial fit methodology would work for a hard magnet, the descending and ascending branches of the hysteresis curves measured for an Alnico II sample were fitted with polynomials of varying degrees. The fits were of very good quality, and the resulting polynomial coefficients revealed symmetrical minor loops. The polynomials showed a great feasibility for mathematical

The structural, magnetic and thermal features of Strontium (Sr) and iron doped (LaMnO3) have been studied to optimize their Hyperthermia efficiency. Citrate-gel technique was employed to synthesize (La1-xSrxMnO3) (x = 0.27, 0.3& 0.33) and a new composite (La1-x Srx Mn1-yFeyO3) (x = 0.27, y = 0.03). XRD patterns showed good polycrystalline structures with crystallite size up to 16 nm. HRTEM was employed

The efficacy of graphene and graphene doped with B, Si and N surfaces for the removal of Pb atom is examined by utilising density functional theory calculations. The results show that the binding energy of a single Pb atom on pristine graphene surface is −0.71 eV with the charge transfer of 0.42 electros from Pb to the surface. There is a significant enhancement observed in the binding on the surfaces

Glasses of the composition 40Li2O‒(60-x)Sb2O3: xNd2O3(x = 0.2, 0.4, 0.6, 0.8 and 1.0 mol%) were synthesized by melt quenching technique. The structural and optical characteristics were investigated as a function of Nd2O3concentration. From the optical absorption spectra J-O intensity parameters (Ωλ, λ = 2,4 and 6) were evaluated; the parameters are found to be in the order: Ω2> Ω6> Ω4. The emission

To reveal the origin of the deep in-gap states in hydrogenated TiO2 (H:TiO2), which are located ∼1.5 eV below the conduction band minimum (CBM) and largely enhance the absorption of visible light, we systematically investigate the structural stabilities, electronic states and optical absorption of various defects in hydrogenated rutile and anatase TiO2 using first-principles calculations with the HSE06

In this work, we introduce a novel structure of one-dimensional (1D) binary photonic crystals made of periodic stacks of a dielectric layer followed by alternating graphene and dielectric stripes. The transfer matrix method (TMM) is employed to investigate the electromagnetic wave propagating in such a structure and determine the transmittance of the incident radiation. The photonic band gap width

We report crystal growth and Raman spectroscopy characterization of pure and mixed bulk topological insulators Bi2Se3-xTex (x = 0–3). The series comprises of both binary (Bi2Se3, Bi2Te3) and ternary tetradymite (Bi2Se1Te2, Bi2Se2Te1, Bi2Se1·5Te1.5) topological insulators. We analyzed in detail the Raman peaks of vibrational modes viz. out of plane A11g, A12g and in-plane Eg2 for both binary and ternary

Based on ab initio calculations of the ground state energy as a function of volume E(V) and thermodynamic model of the crystal lattice, we study the role of phonon anharmonicity in the formation of a complex of thermal and elastic properties of UGe2. In the framework of the developed model, an explanation is given for the first time of the experimentally observed abnormal growth of the bulk modulus

In this paper, β-Ga2O3 single-crystal with three different (100), (010) and (001) orientations and Si-/Mg-/Fe-/Sn-doped are synthesized by EFG method. β-Ga2O3 is investigated by confocal Raman and PL spectroscopy. Raman results indicated that 3D Ga2O3 substrates in the cases of un-/ions-doped growth have superior crystallinity and high uniformity. The possible reasons for the shift and broadening of

The combined effects of Ba-filling the voids and GaSb nanophase incorporation in the matrix of Co4Sb12 have been studied for thermoelectric properties. High energy ball-milling was used to disperse GaSb in Ba0·2Co4Sb12. A slight off-stoichiometry between Co and Sb generated CoSb2 and CoSb phases. Electron back-scattered diffraction showed nanocrystalline (50–200 nm) GaSb grains uniformly distributed

Strontium hexaferrites has significance role in hexaferrites family. SrFe12-2xZnxCrxO19 (x = 0.0 to 0.5) was synthesized by simplified Sol-gel method. All samples were first calcined and then sintered at 920 °C for 20 min. X-ray Diffracto-meter (XRD) and Scanning Electron Microscopy (SEM) were used to analyze its structural and morphological variations respectively. Microstructural variations were

In this paper, we study a size-dependent functionally graded piezoelectric (FGP) plate model based on the combination of the modified couple stress and nonlocal elasticity theories, named nonlocal modified couple stress theory (NMCS). Continues variation of the material properties (chosen from PZT family) through the thickness of the plate is considered according to the power law distribution. Employing

The inadequate bonding strength of graphene and metal matrix is a major challenge to improve the mechanical properties of graphene metal-matrix composites. Here, molecular dynamics simulation is performed to investigate the effect of layer thickness on the mechanical properties of the nickel-coated graphene-reinforced aluminum (NGR-Al) matrix nano-multilayers (NMs) under uniaxial tension and compression

Rigorous analysis on the formation of Bound Magnetic Polaron (BMP) in Cd1-x1Mnx1Te/Cd1-x2Mnx2Te Semimagnetic Concentric Double Quantum Ring (SCDQR) for various magnetic field and ring dimensions has been made by estimating Spin Polaronic Shift (SPS) using variational technique. The concentration of Mn2+ has been varied in both the ring and barrier material to estimate the shift in the BMP formation

The Vienna ab-initio simulation package (VASP) and Density Functional Theory (DFT) calculation method are used to study the structural and detailed electronic properties through atomic substitution in the CH3NH3Pb(1-x)Y(x)I3 (YSr, Ca x = 0.125, 0.25, 0.50, 0.75, and 1.0) perovskites. We determined that the non-stoichiometric crystal structures were calculated as a distorted orthorhombic phase as predicted

Li+ ion conducting properties in Li1·3Al0·15Y0·15Ti1·7(PO4)3 (LAYTP) compound added with 10 wt % Li2O and x wt% MgO (where x = 15, 25, 35, 45) binder salts are investigated in the present study. LiTi2(PO4)3 (LTP) is found to be the primary Li+ ion conducting phase. This phase belongs to NASICON group with R3‾c space group. A maximum Li+ ion conductivity of ~10−4 S/cm for bulk and ~10−7 S/cm for grain

We report a facile but effective method to produce heterojunction diodes by simply depositing AGZO thin films on Si substrates, and investigate the influences of the thickness of AGZO layer on diode performances. AGZO layers are subjected to device studies to find a correlation between the thickness of AGZO and diode performances. The results suggest that a variation in the thickness of AGZO insignificantly

Expanding the industry and technology of semiconductors requires developing the multifunctionality and performance of p-type transparent conducting oxides (TCO). This work is an attempt to tune the physical properties of nickel oxide (NiO) by using the codoping approach. Pb-doped and (Ir, Pb) codoped films have been deposited by sol-gel combined with spin coating technique. XRD, EDS, and AFM were used

M-type Strontium Hexaferrite (SrFe12O19) is prepared using citrate precursor sol-gel method. The X-ray spectrum confirms that synthesized nanomaterials were in a pure phase with the hexagonal crystal symmetry with P63/mmc space group. The Williamson-Hall plot is utilized for calculating crystallite size and lattice strain in hexaferrite nanomaterials. Lattice parameters (a) and (c) show noticeable

We have prepared a 20% Pr doped Sm0.55Sr0.45MnO3 sample by using the solid-state reaction and studied the magnetic and electrical properties. Arrott plots confirm the occurrence of a first-order phase transition. All the signatures of the FM first-order transition disappear above a critical magnetic field. Based on dc-electrical conductivity, a metal semi-conductor transition has been observed at TM-Sc = 180 K

In present study, sol-gel derived Ti(1-x)FexO2(0 ≤ x ≤ 10%) rutile nanoparticles were synthesized and their structural, optical and morphological characteristics were studied in detail. XRD showed the single rutile phase of Ti(1-x)FexO2 nanocrystals without impurity. FTIR and Raman spectroscopic analysis also confirmed the single phase lattice structure without any impurity detection. SEM images showed

The structures containing iron and nickel can provide a unique platform for supercapacitor electrodes. In this research, the synthesis of iron and nickel nanoparticles and their hybrid with reduced graphene oxide (rGO) were performed. The samples were characterized with XRD analysis, SEM microscopy along with the EDS mapping, and TEM microscopy. The several electrochemical tests, i.e. cyclic voltammetry

The paper presents our verification of induction of the superconducting state on a square lattice by the linear electron–phonon interaction for values of the unbalance parameter (γ=λD∕λND) less than γC=0.42. Symbols λD and λND denote the values of the coupling constant in the diagonal and the non–diagonal channel of the self–energy. Calculations were carried out using the Eliashberg equations, in which

In this paper, the density functional theory is used to study the elastic and plastic properties of monolayer phosphorene with and without atomic adsorption. Different atoms, including Li, Mg, O, Al, Pt, Pd and Mo are selected for this purpose. It is shown that adsorption of the phosphorene nanosheet by the majority of selected atoms leads to increasing the elastic modulus of armchair phosphorene,

In this study, the effects of annealing temperature on morphological, optical and structural properties of Radio Frequency (RF) magnetron sputtered Zinc oxide (ZnO) thin films were investigated. ZnOs exhibited characteristic peaks corresponding to the planes (100) and (002) at 31.7 and 34.5°, respectively. The (002) plane was the preferential orientation for all films and confirmed the hexagonal wurtzite

Cerium oxide (CeO2) nanoparticles (also called nanoceria) have broad range of applications in various fields, especially in the biomedical sector. Doping of CeO2with different elements can vary the optical, structural, biomedical and electrical characteristics of cerium dioxide nanoparticles. In this study CeO2was doped with different concentrations of Manganese (Mn) and Iron (Fe). The characterization

Photoanode material, as the core component of photoelectrochemical cell, has attracted great research interest. Here, bromine doped Bi2O3 nanowires (BBON) are achieved through a simple top-down method. Bromine doping changes the chemical environment of bismuth and oxygen atoms, and also changes the band edge position. As a result, BBON photoanode with efficient charge separation shows excellent photoelectrochemical

Realization of oxide/oxide semiconductor hetrostructures based high performance electronic/optoelectronic/magneto-optical devices warrants in-depth understanding of energy band alignment at their interface. Herein, we report energy band alignment in pulsed laser ablated Cr2O3/Ti0.02Cr1.98O3 bilayer film from the knowledge of core level energies and valence band maxima positions in the corresponding

Herein the deposition and characterization of CuO films with various doping concentrations of boron through the application of the SILAR method are performed. Structural, morphological, and optical properties of the films are determined by SEM with EDS, XRD, and UV/Vis spectroscopy. EDS analysis proved the boron contributions in the films. SEM images showed that boron-doping has a decreasing effect

MgCo2O4 a spinel ceramic was studied by complex. impedance spectroscopy technique. The measurements were performed in the temperature and frequency ranges 83–323 K and 40 Hz to 1 MHz, respectively. The decreasing trend in Nyquist plots semicircles was observed as a function of temperature indicating the distribution of different relaxaion processes. Two equivalent circuit models (RgCg)(RgbQgb) below

A nonlinear thermodynamic theory is used to investigate the phase structures, polarization and pyroelectric properties of polydomain epitaxial Ba0.6Sr0.4TiO3 thin films. Polydomain a1/a2/a1/a2, ca1/ca2/ca1/ca2, aa1/aa2/aa1/aa2, r1/r2/r1/r2 phases and single domain tetragonal c, paraelectric PE phases have been found in the misfit strain-temperature phase diagram. Note that the polydomain phases are

Semiconductor nanostructures are an active subject of research by its quantum properties and its potential applications. Nanostructures include nanoparticles, nanowires, quantum wells, and other nanometric structures. We modeled by finite element method the spectrum of an electron confined in a truncated cone-shaped CdSe nanotube. Simulations include the study of the electron energy behavior and the

We study the behavior of Goos-Hänchen shift (GHS) using s- and p-polarized partial coherent beam incident on three-dimensional (3D) Dirac semimetal. By studying the real part of permitivity of 3D Dirac semimetal, we identify the dielectric, epsilon near zero (ENZ) metamaterial, and metallic regions for the incident wavelength. Interestingly, for s- and p-polarized partial coherent beam, we get a completely

Heavy metals present in wastewater have adverse effect on human health particularly when the concentration increases above the standard values as recommended by World Health Organization (WHO). Many attempts have been made to remove toxic metals from water. In the present study, [email protected]2O4 NPs as adsorbent material has been synthesized through simple, fast and ecofriendly sonochemical method

We investigated the spin- and valley- dependent energy band and transport properties in ferromagnetic silicene superlattice with an off-resonant circularly polarized light. It is obviously found that the spin- and valley-dependent energy gap can be well tuned via the off-resonant circularly polarized light. Fully spin and valley-polarized can be realized in certain ranges of light intensity. What is

To develop rare earth free permanent magnets, the compositions of rapidly quenched binary Co–Zr alloys and Fe substituted Co–Zr alloys were optimized. The Co100-xZrx alloys with x = 16–18 show good combination of hard magnetic properties. The highest coercivity of 3019 Oe was obtained at x = 18 and the highest maximum magnetic energy product of 4.97 MGOe was obtained at x = 17. In the Co82-yZr18Fey

The spray pyrolysis is fast and simple method for deposition of CeO2 – rutile TiO2 coatings on stainless steel substrate. The coatings were deposited on stainless steel substrate and characterized by XRD, AFM, XPS, Raman, DRS and photoactivity test for methyl orange decolorization. Photoactivity of CeO2 – rutile TiO2 coatings increase with increasing CeO2 content up to 5 wt% and further increase of

This study presents the comprehensive characterization of rectifying Schottky diodes by current-voltage and impedance measurements, with the prime objective to analyze the bias and temperature dependence of impedance spectra of the fabricated diodes. For that, the impedance of the Ni/p-Si/Al Schottky diodes has been measured at various forward and reverse bias varied from +1.2 to −5.0 V, the frequency

We address quantum spin helical states in the strongly frustrated Heisenberg model. Contrary to conventional Dzyaloshinskii-Moriya approach we show that such states appear without central symmetry breaking. As an example, we demonstrate that the magnetic and thermodynamic properties of the quasi-two-dimensional square-lattice compound (CuBr)Sr2Nb3O10 can be interpreted within 2D S=1∕2 J1−J2−J3 Heisenberg

The Fokker–Planck equation derived by Brown for the probability density function of the orientation of the magnetic moment of single domain particles is one of the basic equations in the theory of superparamagnetism. Brown’s equation has an analytical solution, which is represented as a series in spherical harmonics with time-dependent coefficients. This analytical solution is commonly used when studying

In this work CdS thin films were deposited onto glass and p-Si substrates by ultrasonically spraying of precursor solutions prepared in molarity ranging from 0.025 M, to 0.1 M. Structural investigations revealed that all films have hexagonal structure and mean crystallite size was found to be in the range of 18 nm–21 nm. On the other hand, CdS films exhibited 65–70% optical transmittance and band gap

Transport properties of Pr0.7Ca0·3Mn0·85Cr0·15O3(Cr-PCMO) manganite have been studied in a large frequency and temperature ranges by mean of impedance spectroscopy. The conductance spectra are discussed in the outline of a double and single Jonscher laws for the temperature ranges [80 K–110 K] and [120–170 K] respectively. The correlated barrier hopping and the non small polaron tunneling (NSPT) conduction

The toxicity and stability of all-inorganic perovskite quantum dots are major challenge to be addressed in its commercialization process. Here, the toxicity of lead is reduced while improving the optical properties of quantum dots via replacing Pb2+ ions in CsPbBr3 perovskites quantum dots with low-toxicity and cost-effectiveness Cu2+ cations. The PL emission and absorption peaks of quantum dots appear

After investigating Landau levels and magneto-optical response of nodal line semimetals detailedly, we find that the Landau levels structures are ample when the magnetic field is present. The Landau levels are gapless and staggered corresponding to special magnetic field strength. In the presence of the double peaks derived from the transition between the staggered Landau levels, the background of

A series of Cd0.5Cu0.5-xMgxFe1.95La0.05O4 (x = 0.0, 0.125, 0.25, 0.375, 0.5) nano ferrites was synthesized via sol-gel auto combustion route. XRD analysis confirmed the development of spinel ferrites. Different structural parameters like lattice constant, tetrahedral and octahedral radii, oxygen ion parameter, tolerance factor, bond lengths, edge lengths and interionic distances were calculated from

This study investigates thermophysical and mechanical traits of organic waste incorporated fired clay as an energy efficient material. Sawdust, tea waste, and wheat husk were added in clay to prepare composite blocks at different sintering temperatures. Physical and hydric properties of waste incorporated material revealed a linear relationship with waste percentage for water absorption, loss-on-ignition

The transmission of the electron across the single normal metal-graphene (NG) and normal-metal-graphene-normal-metal (NGN) junctions has been investigated. For the single NG junction, the profile of the maximum transmission bears similarity to that of the conductance of the system and the minor effect of the incidence energy on transmission is found in conductance of the single NG junction. Concerning

The α-Fe2O3/Cu2O heterostructure (HS) was prepared via the hydrothermal precipitation method and used in the kinetic study of the methylene blue (MB) photodegradation. The samples were subjected to the photoluminescence spectroscopy (PL) to evaluate the e/h recombination rate and the results showed a significant decrease in PL intensity of the heterostructure with respect to the individual semiconductors

Weak interactions are not negligible in layered structures and contribute strongly in their physical behaviors. Thanks to NL-vdW functionals and analysis methods of the electron density, their analysis is possible, which allows to better understand their effects on the different physical properties of solids. We have studied the role of weak interactions on structural properties, mechanical stability

We present experimental observations of the high-performance magneto-optic (MO) CeF3 crystal using terahertz time-domain spectroscopy (THz-TDS) in the temperature range 40–300 K for the first time. The complex refractive index strongly depends on temperature, which increases with increasing temperature. Intriguingly, the changes of complex refractive index values reach more than 0.1 between 40 K and

We report on the properties of single crystals of Pr0.5Ir4Sb10.2Sn1.8, a new partially-filled rare earth skutterudite which exhibits Kondo alloy and heavy fermion behavior. Using magnetic susceptibility, specific heat, and resistivity measurements we find evidence of Kondo-screening of the f-moments. This material shows a Kadowaki-Woods ratio consistent with heavy fermion behavior. Susceptibility measurements