Lattice constant of Bi2Se3 and Sb2Te3 crystals is determined by x-ray powder diffraction measurement in a wide temperature range. Linear thermal expansion coefficients (α) the are extracted, considerable anisotropy between α|| α⊥ observed. The low values α can be fit well Debye model, while an anomalous behavior at above 150 K evidenced explained. Grüneisen parameters materials also estimated room temperature.

The humidity sensing performance of cobalt ferrite nanoparticles (CoFe₂O₄ NPs) with controlled morphology obtained <italic>via</italic> a solution route is reported in this work.

The (BH)_max value of 2.41 MGOe at room temperature confirmed the capabilities CoFe₂O₄ NPs in permanent magnets for current technological applications.

Inelastic light scattering spectra of Bi2Se3 and Sb2Te3 single crystals have been measured over the temperature range from 5 K to 300 K. The dependence dominant A1g2 phonons shows similar behavior in both materials. peak position linewidth is analyzed considering anharmonic decay optical material thermal expansion. This work suggests that Raman spectroscopy can be used for thermometry Bi2Se3- Sb2Te3-based devices a wide range.

In this work, we report a low cost, facile synthesis method for Nickel ferrite (NiFe₂O₄) nanostructures obtained by chemical bath deposition alternate transition metal oxide electrode material as solution clean energy. We developed template free ammonia assisted obtaining porous structure which offering better supercapacitive performance of NiFe₂O₄ than previously reported pure NiFe₂O₄. Here explore the physical characterizations X-ray diffraction, FESEM, HRTEM performed to under-stand its...

The synthesis, structural, luminescent, and magnetic properties of multifunction 8 at. % Eu-doped Gd2O3 nanocrystals were investigated. material was synthesized by the solution combustion technique characterized x-ray diffraction (XRD), transmission electron microscopy, photoluminescence magnetization measurements. as-prepared presents predominant base-centered monoclinic structure with average crystallite size 35 nm. Isothermal annealing at 1000 °C for up to 152 h induced gradual structural...

A Freundlich adsorption isotherm model confirms a plausible humidity sensing mechanism when using wet chemically prepared Zn_1−xNi_xO nanostructures.

Abstract In this research paper we present a comparative study on the enhanced piezoelectric performance between Carbon Nanotubes (CNT)/PVDF nanocomposite as well Iron‐Reduced Graphene Oxide (Fe‐RGO)/PVDF nanocomposite. The is realized by unique device structure, in which bottom electrode physically not contact with film until external excitation applied. FTIR characterization shows enhancement of polar crystallization phases due to electrostatic interactions PVDF addition CNT and Fe‐RGO....

Multiple phase transitions and magnetic coexistence lead to a negative magnetocaloric effect in wide temperature range of ∼10–250 K La0.215Pr0.41Ca0.375MnO3. A large fraction the originates from low separated state, which is composed coexisting, field dependent charge ordered, ferromagnetic regions. While maximum isothermal entropy change modest, persistence field-dependent state over ∼240 span yields refrigeration capacity ∼3.2 J/cm3. Materials with separation can therefore be used improve...

The end members, Bi and Bi${}_{2}$Te${}_{3}$, of the infinitely adaptive (Bi${}_{2}$)${}_{m}$(Bi${}_{2}$Te${}_{3}$)${}_{n}$ series compounds have not only been revealed to be topological insulators under appropriate conditions, but also shown superconductors pressure, suggesting potential for bulk superconductor-topological-insulator interfaces associated quantum computing applications. Herein, we report pressure-dependent evolution structure electrical transport nominal semimetal...

Adsorption isotherm models confirm the effect of Cu intercalation on humidity sensing properties topological insulator Bi₂Se₃ single crystals.

Optically transparent nanostructured silica films functionalized with phenol red dye were prepared by spin coating on glass slides. X-ray diffraction (XRD) studies revealed 2D hexagonal symmetry of the film mesophase aligned parallel to surface substrate. The designed photofunction was spectroscopically tested for pH sensing application. displayed analytical dynamic range 5–12 measuring units response time less than 1 s. resistant peel off test and could be used up 15–18 counts measurements....

We demonstrate chemical doping of a topological insulator Bi2Se3 using ion implantation. Ion beam-induced structural damage was characterized grazing incidence X-ray diffraction and transmission electron microscopy. reversed simple thermal annealing step. Carrier-type conversion achieved implantation followed by an activation anneal in thin films. These two sets experiments establish the feasibility for modification Bi2Se3, prototypical insulator. can, principle, be used any The direct...

We examined the thermal conductivity of (Bi${}_{2}$)${}_{m}$-(Bi${}_{2}$Te${}_{3}$)${}_{n}$ alloys, which are composed alternating sequences Bi${}_{2}$ and Bi${}_{2}$Te${}_{3}$ structural units. The phonon these alloys was sharply reduced relative to that elemental Bi for temperatures below 100 K. Our measurements suggested defects reduce in materials. Using Debye-Callaway model heat transport, we link this point defects.

Nanostructured SnSe samples with specific morphologies like rods, rod-flowers, flakes, and flake-flowers were synthesized using the same reactants but a control over various growth parameters involved in hydrothermal reaction process. The morphology detailed microstructure of obtained have been studied by means field-emission scanning electron microscopy (FE SEM) high resolution transmission (HR-TEM). sample quality, homogeneity, phase purity thoroughly selective area diffraction (SAED)...

Nanostructures of bismuth selenide (Bi2Se3), a 3D topological insulator material, and nickel (Ni) doped Bi2Se3 samples were prepared by hydrothermal method to explore the field emission properties. An enrichment in electron (FE) properties terms threshold turn-on values Ni nanostructures was measured at base pressure ∼1 × 10-8 mbar. Using background Fowler-Nordheim (FN) theory enhancement factor (β) 5.7 103 value 2.5 V μm-1 for 7.5% determined investigating J-E plot FE data. The β is three...

Formation of cresol red dye immobilized silica films derived by conventional as well CTAB and P123 templated sol–gel is discussed. Comparative structural, textural, optical properties these three different methodologies were determined using analytical instrumental techniques like X-ray Diffraction (XRD), Atomic Force Microscope (AFM), Scanning Electron (SEM), surface area, porosity measurements. Optical pH sensing response monitored visible spectrophotometer. An attempt made to demonstrate...

The larger surface area and increased point contacts of hierarchically arranged ZnO nanowires (upper panel) offered more potential barriers for the gas molecule exhibiting binding strength CO &lt; C₂H₅OH NH₃ (lower provided excellent gas-sensing performance at 100 °C gas.

TmAgGe is an antiferromagnet in which the spins are confined to distorted kagome-like planes at low temperatures. We report angle-dependent measurements of magnetization $M$ fields up $55\phantom{\rule{0.3em}{0ex}}\mathrm{T}$ that show there two distinct and separate energy scales present TmAgGe, each responsible for a set step-like metamagnetic transitions: weak exchange interactions strong crystalline-electric-field (CEF) interactions. Simulations using three-dimensional, free-energy...