Sensitive and selective imprinted electrochemical sensor for p-nitrophenol based on ZnO nanoparticles/carbon nanotubes doped chitosan film

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• 作者：Yu-fang Hu^a ; ^b ; Zhao-hui Zhang^a ; ^b ; ^{zhaohuizhang77@163.com} ; Hua-bin Zhang^a ; Li-juan Luo^a ; Shou-zhuo Yao^b
• 关键词：Imprinted thin films ; Electrochemical sensors ; Multi-wall carbon nanotube ; Zinc oxide ; Chitosan ; p-nitrophenol ; Composites ; Cyclic voltammetry
• 刊名：Thin Solid Films
• 出版年：2012
• 期刊代码：78_00406090
• 类别：ph
• 出版时间：1 June, 2012
• 卷：520
• 期：16
• 页码：5314-5321
• 文件大小：1423 K

摘要

A sensitive and selective molecularly imprinted electrochemical sensor for p-nitrophenol detection has been developed based on ZnO nanoparticles/multiwall carbon nanotubes (MWNTs)-chitosan (CTS) nanocomposite. This nanocomposite was dripped onto an indium tin oxide electrode and then imprinted sol-gel solution was electrodeposited onto the modified electrode to construct the proposed sensor. The morphologies and electrochemical behaviors of the imprinted sensor were characterized by scanning electron microscope, X-ray diffraction, electrochemical impedance spectroscopy, square wave voltammetry and cyclic voltammetry. The imprinted sensor displayed excellent selectivity towards the target molecule p-nitrophenol. Meanwhile, the introduced nanocomposite increased surface area and active sites for electron transfer, thus remarkably enhancing the sensitivity of the imprinted sensor. Under optimal conditions, the peak current was linear to p-nitrophenol concentration ranging from 1.0 脳 10^鈭?#xA0;8 to 2.0 脳 10^鈭?#xA0;4 mol路L^鈭?#xA0;1 with a detection limits of 1.0 脳 10^鈭?#xA0;9 mol路L^鈭?#xA0;1 (S/N = 3). This proposed sensor was applied to the detection of p-nitrophenol in various water samples successfully.