MWCNT/EP膜片的力-电特性和无线应变传感器

doi:10.11885/j.issn.1674-5086.2020.09.29.03

摘要/Abstract

摘要： 将多壁碳纳米管（MWCNT）添加到环氧树脂（EP）中，其随机分布会形成一个复杂的导电网络。由于MWCNT在EP基体中的形状各异，个体或曲或直，相互之间或分离或交叉，使得MWCNT/EP纳米复合材料具备了电感、电阻和电容的特性。本研究提出了MWCNT/EP纳米复合材料的RLC内部等效电路，测试了0.6 wt.% MWCNT/EP纳米复合材料薄膜对电磁信号的响应。研究发现，MWCNT/EP纳米复合材料薄膜可在特定频率的电磁波激励下产生谐振，且谐振频率随着纳米复合材料的应变发生偏移，从而证明了利用MWCNT/EP纳米复合材料制备无线应变传感器的可行性。通过对MWCNT/EP纳米复合材料薄膜的力-电特性实验和理论分析，提出了开发标签式射频应变传感器的思路。

关键词: 多壁碳纳米管, 无线传感, 频移, 力-电特性, 应变传感器

Abstract: When multi-walled carbon nanotubes (MWCNTs) are added into epoxy resin (EP), the randomly distributed MWCNTs will form a complex conductive network. The MWCNTs take different shapes in the EP resin, and they are either curved or straight, separated or intersected with each other, so the MWCNT/EP nanocomposites possess the characteristics of inductance, resistance and capacitance. In this study, an equivalent RLC internal circuit of the MWCNT/EP composite material was proposed, and the response of the 0.6 wt.% MWCNT/EP composite film to electromagnetic signals was tested. It is found that the MWCNT/EP composite film can resonate under the excitation of electromagnetic waves at a specific frequency, and the resonant frequency shifts with the strain of the film. Hence, the feasibility of using MWCNT/EP composite materials to fabricate wireless strain sensors is proven. Based on the experimental and theoretical analysis of the mechanical-electric characteristics of the MWCNT/EP composite film, the idea of developing a tag-type radio frequency strain sensor is proposed in this article.

Key words: multi-wall carbon nanotube, wireless sensing, frequency shift, force-electric characteristics, strain sensor

中图分类号:

TU452

徐强, 袁卫锋. MWCNT/EP膜片的力-电特性和无线应变传感器[J]. 西南石油大学学报(自然科学版), 2021, 43(6): 94-101.

XU Qiang, YUAN Weifeng. An Experimental Study on Fracture Characteristic of Sandstone Subjected to Cyclic Wetting and Dryings[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(6): 94-101.

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