Fabrication of ZnO nanoparticles based sensitive methanol sensor and efficient photocatalyst

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• 作者：M. Faisal^a ; ^{mdfaisalahsan@gmail.com} ; Sher Bahadar Khan^b ; ^c ; Mohammed M. Rahman^b ; ^c ; Aslam Jamal^a ; M.M. Abdullah^a
• 关键词：ZnO nanoparticles ; Hydrothermal synthesis ; Methanol chemical sensor ; Photocatalyst ; Methylene Blue
• 刊名：Applied Surface Science
• 出版年：2012
• 期刊代码：6_01694332
• 类别：ms
• 出版时间：15 July, 2012
• 卷：258
• 期：19
• 页码：7515-7522
• 文件大小：971 K

摘要

ZnO nanoparticles (NPs) were prepared by hydrothermal treatment with starting materials (zinc chloride and urea) in the presence of ammonium hydroxide and characterized by powder X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy and UV-vis spectroscopy. The synthesized nanoparticles are crystalline with wurtzite hexagonal phase having average particle size in the range of 80-130 nm. Photocatalytic activity of the prepared ZnO NPs was evaluated by the degradation of methylene blue and almost complete degradation (91.0%) takes place within 85 min of irradiation time. Prepared ZnO nanostructures possessed high photocatalytic activity when compared with TiO₂-UV100. Additionally, the sensing properties of the ZnO films were investigated for various concentrations of methanol in liquid phase by simple I-V technique at room conditions. It was observed that ZnO thin film exhibits good sensitivity (0.9554 渭A cm^鈭? mM^鈭?) towards detection of methanol at room conditions.