ZnO nanowires-polyimide nanocomposite piezoresistive strain sensor

被引:36
作者
Chen, Qian [1 ]
Sun, Yingying [1 ]
Wang, Ying [1 ]
Cheng, Hongbin [1 ]
Wang, Qing-Ming [1 ]
机构
[1] Univ Pittsburgh, Dept Mech Engn & Mat Sci, Pittsburgh, PA 15261 USA
基金
美国国家科学基金会;
关键词
ZnO nanowires; Nanocomposite; Percolation threshold; Piezoresistivity; Gauge factor; Strain sensor; ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY; ORGANIC COATINGS; FABRICATION;
D O I
10.1016/j.sna.2012.11.006
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
In this paper, we report a significant piezoresistive effect found in ZnO nanowires-polyimide nanocomposite. ZnO nanowires were synthesized through a simple hydrothermal route and subsequently mixed with polyimide matrix to form ZnO nanowires-polyimide nanocomposite. Electrical properties of the nanocomposite films, such as electrical conductivity, relative dielectric permittivity, impedance spectrum and electrical I-V curve, change with weight ratio of ZnO nanowires were characterized. Electrical measurement results indicated that the percolation threshold of the nanocomposite is about 15% weight ratio of ZnO nanowires. Piezoresistive effect of the nanocomposite was investigated and large gauge factor was observed for this nanocomposite. Strain sensors based on the nanocomposite thin films using interdigital electrodes were fabricated and used to measure the static and dynamic strain in a cantilever beam and the results were validated by theoretical calculation and measurements by other technique. With excellent flexibility, simple fabrication process, and large piezoresistive gauge factor, this novel ZnO nanocomposite can be used for strain sensors in many mechanical, civil, aerospace, and medical applications. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码:161 / 167
页数:7
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