Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10625501 | Ceramics International | 2014 | 34 Pages |
Abstract
Hierarchical undoped, vanadium and tungsten doped ZnO nanostructures have been synthesized via a surfactant assisted hydrothermal method. The as-synthesized products were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray analysis (EDAX), UV-visible spectroscopy, photoluminescence (PL) and particle size distribution (PSD) analysis. A possible growth mechanism of the various hierarchical ZnO nanostructures is proposed. Gas response of sensors fabricated from the as-prepared as well as V- and W-doped ZnO were systematically investigated for acetone, ethanol, methanol, formaldehyde, dimethylsulfoxide (DMSO), triethylamine (TEA), ammonia and ethylenediammine (EDA). Undoped ZnO showed ~80% sensitivity towards acetone while on V-doping the sensitivity enhanced up to 92%. In the W-doped ZnO response towards acetone suppressed while the response towards TEA enhanced. The doping and morphology of ZnO are probably responsible for such a difference in the gas response. UV-visible absorption results reveal that doping ZnO with tungsten shows red-shift of the absorption edge. The photoluminescence (PL) studies reveal a slight red-shift in UV emission in pure ZnO upon V- and W-doping, which is assumed to be associated with the different compress stress in the architectures.
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Authors
Parag V. Adhyapak, Satish P. Meshram, Aarti A. Pawar, Dinesh P. Amalnerkar, Uttam P. Mulik, Imtiaz S. Mulla,