Journal
MATERIALS TODAY COMMUNICATIONS
Volume 26, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.mtcomm.2021.102101
Keywords
Zinc oxide; Zinc tungstate; Thermal plasma; Work function; Heterojunction; Photocatalysis
Categories
Funding
- SPPU-ISRO space technology cell, Pune
- SERB, New Delhi
- CSIR, New Delhi
- DST, New Delhi
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This paper reports the single-step synthesis of ZnO-ZnWO4 nanocomposites using thermal plasma route, with X-ray diffraction and Raman spectroscopic techniques used to analyze the composite phases. The optical properties and photocatalytic efficiency of the synthesized product were studied, showing a high degradation rate of Crystal Violet dye. These nanocomposites exhibited a significant improvement in photocatalytic response compared to pure ZnO nanoparticles under sunlight radiation.
In this paper we report single step synthesis of ZnO - ZnWO4 nanocomposites using thermal plasma route, where thermal plasma plume having sufficiently high thermal flux was impinged onto zinc -tungsten precursor and the species so evaporated were made to interact with oxygen in gas phase to get the final product. X-ray diffraction and Raman spectroscopic techniques were used to ascertain the composite phases. X-Ray Diffraction and Raman Spectroscopic analysis witnessed the formation of ZnO-ZnWO4 nano-composites, with monoclinic wolframite structure of tungstate while wurtzite structure of ZnO. Optical properties of the as synthesized product were recorded and analyzed using UV-vis and Photo-luminescence spectroscopic techniques. Retarding field diode method was used to determine work function of the ZnO-ZnWO4 composites under investigation, where gold sample was used as a reference. Subsequently, the photocatalytic efficiency of such ZnO-ZnWO4 nano-composites was analyzed by assessing the degradation of Crystal Violet dye. Experimentally measured values of surface work-function of the composites were analyzed and corelated with photocatalytic response. The degradation of Crystal Violet up to 82.07 % was achieved for 5 wt. % of W in the composite as compared to a value of 25.14 % for the pure ZnO nanoparticles under the exposure to sunlight radiations.
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