Effect of CuS buffer layer on the structural and optical properties of TeO₂ nanowires: a comparative study

Abstract

The current work concerns with the effects of cupper sulfide (CuS) buffer layer on morphological, structural and optical properties of tellurium dioxide (TeO2) nanostructured thin films synthesized by vapor transport method. Single crystalline tetragonal TeO2 crystallographic phase with enhanced peak intensity and crystallinity for CuS/TeO2 film are observed by X-ray diffraction analysis. Scanning electron microscopy examinations revealed small rod-like morphology for TeO2 and randomly oriented nanowires morphology for CuS/TeO2 samples. The estimated optical band gap energies were 3.78 and 3.63 eV for TeO2 and CuS/TeO2 nanostructured films, respectively. The photoluminescence of CuS/TeO2 film was enhanced and red-shifted from 450 to 455 nm by the presence of CuS layer. The effective charge carrier life times were 0.14 ns and 1.92 ns for TeO2 and CuS/TeO2 films, respectively. These results could be beneficial for optoelectronic devices such as light emitting devices.

Morphological and optical characterizations of Sb2O5 nanorods as new photoelectrode for hydrogen generation

“…As these processes are repeated several times wedge-like morphologies are grown. The wedge-shaped can be clarified via similar manner to silicon and TeO 2 nanowires growth with tapering [35,36]. According to Mohamed et al [30] and, Sharma and Sunkara [36] as the nanorods elongate, the lower parts of the nanorods remain exposed to the deposition of both Sb and O for long periods compared to the newly grown upper parts.…”

Some characteristics of Cu/Cu2O/CuO nanostructure heterojunctions and their applications in hydrogen generation from seawater: effect of surface roughening

“…0.5 mm thick copper (Cu) foils of 99.99% purity were purchased from Sigma-Aldrich and used to synthesize Cu/Cu 2 O/CuO nanostructures using thermal oxidation under flows of argon (Ar) and oxygen (O 2 ) gas mixture. The used setup is consisted of a fully controlled horizontal quartz tube furnace, two mass flow meters and two (Ar and O 2 ) gas cylinders as shown schematically in [30]. Before the oxidation process, part of the Cu foils was roughed with sandpaper (AA150, China).…”

Preparation of Laterally Chloro-Substituted Schiff Base Ester Liquid Crystals: Mesomorphic and Optical Properties

“…The absorption was found to increase with the alkyl side chain length until ICI10 and thereafter slightly decreases for the IC over, the low energy absorption tail becomes more prominent with increase side chain length as revealed from Figure that ICI6 has no tail while the sampl more prominent tail. The direct energy bandgap (Eg) of synthesized liquid materials was evaluated through Tauc's Equation [42][43][44][45]: 𝛼ℎ𝜐 = 𝐴 𝐸 − 𝐸 is the absorption coefficient evaluated by 𝛼 =…”

“…Moreover, the low energy absorption tail becomes more prominent with increase of alkoxy side chain length as revealed from Figure that ICI6 has no tail while the sample ICI12 has more prominent tail. The direct energy bandgap (E g ) of synthesized liquid crystalline materials was evaluated through Tauc's Equation [42][43][44][45]: (αhυ) 2 = A E − E g , where α is the absorption coefficient evaluated by α = Absorption thickness . The Tauc plot of four materials is shown in Figure 8.…”