WO3/WS2 composite materials for gas sensor and energy storage applications

Transition metal binary compounds, especially oxides and chalcogenides, are material of choice for many applications. Particularly, tungsten trioxide (WO3) has been extensively studied due to its outstanding electrochromic and photochromic properties in the visible and infrared region, high coloration efficiency and relatively low price [1], which makes it suitable for the construction of smart windows, mirrors, optical shutters and display devices [2]. Tungsten trioxide is also a good photocatalyst, gas sensor, chemical sensor and biosensor, material [3]. On the other hand, tungsten disulfide (WS2) with its unique properties is a promising material for a number of applications such as solid lubricants, catalysts, photosensitive films, electronic and optical devices [2]. Both the materials and their nanocomposites are of great interest for energy storage applications

Retroreflection from Nanoporous InP

Pronounced retroreflection behavior is reported for a fishnet nanoporous strongly absorbing semiconductor material. Retroreflection appears with diffusive specular reflection for all angles of incidence. Retroreflection is apparent by the naked eye with day light illumination and exhibits no selectivity with respect to wavelength and polarization of incident light featuring minor depolarization of retroreflected light. The phenomenon can be classified neither as coherent backscattering nor as Anderson localization of light. The primary model includes light scattering from strongly absorptive and refractive super-wavelength clusters existing within the porous fishnet structure. We found that retroreflection vanishes for wavelength where absorption becomes negligible

Nanofibrous Zinc Oxide Films Synthesized By Magnetron Sputtering

ZnO nanofibrous-based materials required for sensors and dye-solar cells have been grown on tin oxide/glass substrates by magnetron sputtering. Synthesis regimes have been identified that give nanoporous and nanofibrous morphologies of depositions as shown by SEM. The structural properties of the nanomaterial have been characterized by X-ray diffraction. Vibrational properties have been investigated by Micro-Raman spectroscopy. All experimental data are discussed in details and promising applications are suggested. © 2011 IEEE

Retroreflection of light from nanoporous InP: correlation with high absorption

Access full text - https://doi.org/10.1007/s00339-014-8683-xPronounced retroreflection behavior is reported for a fishnet nanoporous strongly absorbing semiconductor material. Retroreflection appears along with diffusive specular reflection for all angles of incidence for light wavelength corresponding to interband optical transitions, where absorption coefficient is of the order of 105 cm−1 (green and red light). Retroreflection is apparent by the naked eye with daylight illumination and exhibits no selectivity with respect to wavelength and polarization of incident light featuring minor depolarization of retroreflected light. Retroreflection vanishes for wavelength corresponding to optical transparency range where photon energy is lower than the InP bandgap (1.064 μm). The phenomenon can be classified neither as coherent backscattering nor as Anderson localization of light. The primary model includes light scattering from strongly absorptive and refractive super-wavelength clusters existing within the porous fishnet structure. We found that retroreflection vanishes for wavelength where absorption becomes negligibl

Anomalous retroreflection from strongly absorbing nanoporous semiconductors

Access full text - https://doi.org/10.1364/OL.36.003227Pronounced retroreflection behavior is reported for a fishnet nanoporous strongly absorbing semiconductor material. Retroreflection features a half-cone about 0.35 rad along with diffusive specular reflection for all angles of incidence. Retroreflection is apparent by the naked eye with daylight illumination and exhibits no selectivity with respect to wavelength and polarization of incident light featuring minor depolarization of retroreflected light. The reflectance in the backward direction measures 12% with respect to a white scattering etalon. The phenomenon can be classified neither as coherent backscattering nor as Anderson localization of light. The primary model includes light scattering from strongly absorptive and refractive superwavelength clusters existing within the porous fishnet structure. A reasonable qualitative explanation is based on the fact that strict retroreflection obeys shorter paths inside absorbing medium, whereas all alternative paths will lead to stronger absorption of light