Study of far infrared optical properties and, photocatalytic activity of ZnO/ZnS hetero-nanocomposite structure

Abstract

a ZnO nanoplates/ZnS nanoparticles as a hetero-nanocomposite structure was prepared by a single pot precipitation method without using any capping ligands or other additives. The morphology of the prepared nanocomposite was studied by scanning electron microscopy (SEM). Optical properties of the prepared samples were studied by UV-visible reflectance and Raman spectroscopy. The FT-IR spectroscopy along with the Kramers Kronig (k k) method and classical dispersion theory were utilized to calculate far-infrared optical constants of the prepared samples. The photocatalytic activity of the prepared nanoheterostructure was also assessed in the gas solid phase, by monitoring the NO x abatement using a white-lamp to re-create an indoor environment.

ZnO/ZnS heterostructures for hydrogen production by photoelectrochemical water splitting

“…7,49 Therefore, it may be an easy ow of photogenerated electrons towards ZnO and holes towards the electrolyte via ZnS and this faster photo charge collection results in improved water splitting performance. Fig.…”

“…In order to overcome this issue, recent studies 6,7 have proposed the use of hybrid semiconductors systems which might promote the separation of electron-hole pairs and retain reduction and oxidation reactions at two different sites. 8 According to this, the recombination of photogenerated electron-hole pairs may be suppressed and consequently, the photocatalytic efficiency would be increased.…”

“…8 According to this, the recombination of photogenerated electron-hole pairs may be suppressed and consequently, the photocatalytic efficiency would be increased. Due to its importance, several works have been related to this topic; that is the formation of different heterostructures containing ZnO, such as: ZnO/ZnS, 6,7,9 …”

“…Usually, ZnO/ZnS heterostructures with different morphologies, such as nanowires, 6,9 nanorings 15 and other different nanostructures, 7 have been synthetized by means of solutionchemical processes. These chemical processes generate a high number of impurities in the nal products.…”

ZnS coating for enhanced environmental stability and improved properties of ZnO thin films

“…30 These peaks are not found at the spectra of ZnO/ZnS nanolayers, indicating that the ZnS layer was successfully formed on the surface of ZnO, resulting in the extinguishing of the absorption bands related to ZnO vibration. Fig.…”