Sol-gel derived ZnO/PVP nanocomposite thin film for superoxide radical sensor

被引:48
作者
Du, Tianbao [1 ]
Song, Hongwei [1 ]
Ilegbusi, Olusegun J. [1 ]
机构
[1] Univ Cent Florida, Dept Mech Mat & Aerosp Engn, Orlando, FL 32816 USA
来源
MATERIALS SCIENCE & ENGINEERING C-BIOMIMETIC AND SUPRAMOLECULAR SYSTEMS | 2007年 / 27卷 / 03期
关键词
zinc oxide; nanoparticle; sol-gel; sensor; nanocomposite;
D O I
10.1016/j.msec.2006.05.040
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Pure ZnO films and ZnO nanoparticle-dispersed polyvinylpyrrolidone (PVP) composite films are prepared on Pyrex glass substrates by the sol-gel dip-coating technique utilizing zinc acetate precursor. The thin films are extensively characterized for surface morphology, chemistry, and nanocrystallite size using various advanced analytical techniques including Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM). For the processing conditions considered, ZnO, semiconductor thin films with nanocrystallite size 20-30 nm are obtained. The ZnO nanoparticle size in the PVP composite film increases with increase in ZnO content. The resistance of both the synthesized ZnO and ZnO/PVP thin films decrease significantly after exposure to solution containing superoxide anion radicals (SOR). The results thus indicate that ZnO and ZnO/PVP composite thin films can be used as biosensors for SOR and potentially for characterizing the antioxidant properties of fluids. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码:414 / 420
页数:7
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