The effect of oxygen-vacancy-related defects on gas-sensing properties ZnO-nanowire gas sensors was investigated. Gas were fabricated by growing ZnO nanowires bridging the gap between two prepatterned Au catalysts. sensor displayed fast response and recovery behavior with a maximum sensitivity to NO2 at 225 °C. found be linearly proportional photoluminescence intensity in both as-fabricated defect-controlled postannealing Ar H2 atmosphere. This result agrees well previous theoretical...

Monodisperse spherical Ni nanoparticles with diameters of 2 nm, 5 and 7 nm were synthesized from the thermal decomposition a Ni–oleylamine complex. nanocrystal superlattices generated via controlled evaporation solvent (see Figure). The successfully used as catalysts for Suzuki coupling reaction, readily oxidized to produce NiO nanoparticles.

We fabricated a nanowire-based gas sensor using simple method of growing SnO(2) nanowires bridging the gap between two pre-patterned Au catalysts, in which electrical contacts to are self-assembled during synthesis nanowires. The sensing capability this network-structured was demonstrated diluted NO(2). sensitivity, as function temperature, highest at 200 °C and determined be 18 180 when NO(2) concentration 0.5 5 ppm, respectively. Our showed higher sensitivity compared different types...

Novel SnO2−In2O3 heterostructured nanowires were produced via a thermal evaporation method, and their possible nucleation/growth mechanism is proposed. We found that the electronic conductivity of individual was 2 orders magnitude better than pure SnO2 nanowires, due to formation Sn-doped In2O3 caused by incorporation Sn into lattice during nucleation growth shell nanostructures. This provides with an outstanding lithium storage capacity, making them suitable for promising Li ion battery electrodes.

We synthesized free-standing Si nanosheets (NSs) with a thickness of about <2 nm using chemical vapor deposition process and studied their optical properties. The NSs were formed by the formation frameworks first along six different ⟨110⟩ directions normal to [111], its zone axis, then filling spaces between ⟨112⟩ under high flow rate processing gas. showed blue emission at 435 nm, absorbance photoluminescence (PL) excitation measurements indicate that enhanced direct band transition...

Scaling down the charge-trap memory cell for high storage density causes severe reliability issues such as decreased trapped charge density, migration of stored charges to adjacent cells, electrostatic interference between neighboring and gate dielectric breakdown. Therefore, it is highly required explore advanced layer (CTL) having a trap with deep level improved performance reliability. In this study, nonvolatile characteristics are demonstrated using low-temperature atomic deposition...

Ultrawide ZnO nanosheets together with their formation mechanism have been reported. As the width and thickness of sheets are in range 50–100 µm nm respectively, width-to-thickness ratios reach up to one thousand.

We report on the self-supported, two-dimensional (2D) SnS nanosheets electrode directly grown metallic current collectors via non-catalytic and template-free, vapor transport synthetic route. The self-supported demonstrates good cycling performance superior rate capabilities: a capacity of ∼380 mAh g−1 even at 20C (after charging for 3 min), larger than theoretical carbon-based electrodes currently used in commercial Li ion batteries. origin such an improvement long-term cycle stability...

We report Raman scattering results of wurtzite ZnS nanowires, nanocombs, and nanobelts. The spectrum obtained from nanowires exhibits first‐order phonon modes at 272, 284, 350 cm −1 , corresponding to A 1 /E transverse optical, E 2 longitudinal optical phonons, respectively. Several multiphonon are also observed. mode varies in wavenumber for nanocombs nanobelts, indicating that the residual strain during morphological change ultimately Interestingly, a surface (SO) depending on shape...

Core/shell, indium tin oxide (ITO)/TiO2 hybrid nanostructured electrodes for high-power lithium ion rechargeable batteries have been synthesized via a thermal evaporation method followed by pulsed laser deposition (PLD). Lithium-active TiO2 nanoparticles were uniformly assembled onto high-conductivity ITO nanowire arrays that directly grown on metallic current collectors. This configuration resulted in superior rate capabilities and long-term cycle life. Such high electrochemical...

We report on the wrinkle formation in a thin film produced by sol-gel method. Through relaxation of stress, which results from removal solvent during drying process, an isotropic wavy pattern is generated form skeletal branches. The patterns have dominant wavelength satisfying relationship three-fourths order thickness. Densification gelated enhanced increase volumetric strain caused evaporation remaining film. number branches and surface roughness increases as annealing time progresses,...

A new electrode material that is expected to have promising applications in energy storage and energy-harvesting systems presented. In this material, which consists of Ca3Co4O9 nanoplates with a high theoretical gravimetric capacity, the lithium-driven conversion process results formation active/inactive nanocomposite electrodes mitigate aggregation active nanometals (see picture). Supporting information for article available on WWW under...

We herein present the synthesis of germanium (Ge) nanowires on Au-catalyzed low-temperature substrates using a simple thermal Ge/Sn co-evaporation method. Incorporation low-melting point metal (Sn) enables efficient delivery Ge vapor to substrate, even at source temperature below 600 °C. The as-synthesized were found be core/shell heterostructure, exhibiting uniform single crystalline sheathed within thin amorphous suboxide (GeOx) layer. Furthermore, these high-density grown directly current...

Abstract The increasing demand for portable energy has generated significant research interest in nanostructured electrode materials, because of their large interfacial contact area with the electrolyte and short path lengths Li ion transport. To date, titanium dioxide (TiO 2 ) been widely investigated as an electroactive, Li‐insertion host. However, lithium reactivity brookite‐type TiO rarely addressed compared to common polymorphs, anatase rutile, difficulties encountered obtaining a...

We report Raman scattering from single and ensemble CdS nanowires, nanobelts, nanosheets. The spectra of nanobelts nanosheets are notably different those exhibiting a strong enhancement the multiphonon response. Moreover, first-order longitudinal optical (LO) phonon energy systematically increases with increasing lateral size nanowires to These results suggest that phonons in nanostructures influenced by strain, crystallinity, exciton-LO coupling.

We demonstrate the formation of a highly conductive, Fe0/Fe3O4 nanocomposite electrode by hydrogen reduction process. Fe2O3 nanobundles composed one-dimensional nanowires were initially prepared through thermal dehydrogenation hydrothermally synthesized FeOOH. The systematic phase and morphological evolutions from to Fe2O3/Fe3O4, Fe3O4, finally Fe/Fe3O4 controlled thermochemical at 300 degrees C in H2 characterized using x-ray diffraction (XRD) transmission electron microscopy (TEM). shows...

Variable-wavelength photodetectors are fabricated by a selective growth of ZnxCd1−xSe alloy nanowires on patterned Au catalysts thus forming nanowire air-bridges between two Pt pillar electrodes. From the composition-dependent linear changes bandgap energies and lattice parameters, found to be perfectly alloyed in entire range Zn composition without any phase separation have structural transition from zinc blende wurtzite at 0.31 < x 0.72. The spectral responses detectors show that cut-off...

Abstract Transition metal oxides have been suggested as innovative, high-energy electrode materials for lithium-ion batteries because their electrochemical conversion reactions can transfer two to six electrons. However, nano-sized transition oxides, especially Co 3 O 4 , exhibit drastic capacity decay during discharge/charge cycling, which hinders practical use in batteries. Herein, we prepared with high crystallinity using a simple citrate-gel method and used impedance spectroscopy examine...

In this paper we report the fabrication and testing of diode-type low-voltage field emission display (FED) devices with SiC-nanowire-based cathodes. The SiC-nanowire FEDs (flat vacuum lamps) were characterized by low threshold fields (∼2 V µm(-1)), high current density stable long-term performance. analysis data evidenced that Schottky effect would have a considerable influence on from nanowire-based samples, leading to true values enhancement factor being significantly lower than those...