碳纳米管智能传感器压敏性能研究  

Research on pressure sensitive performance of carbon nanotube intelligent sensors

作　　者：张驰宇 孙敏[1] ZHANG Chiyu;SUN Min(School of Civil Engineering,SUST,Suzhou 215011,China)

机构地区：[1]苏州科技大学土木工程学院,江苏苏州215011

出　　处：《苏州科技大学学报（工程技术版）》2024年第4期53-58,共6页Journal of Suzhou University of Science and Technology（Engineering and Technology Edition）

基　　金：国家自然科学基金(52178149)。

摘　　要：为了实现智能传感器的研发和结构监测的实时化,在水泥砂浆掺入改性碳纳米管制备一种新型的智能传感器。采用四电极法进行了传感器极化曲线分析、从加载到破坏的电阻率分析、不同速率下的循环加载试验、不同最大加载幅值下的压敏性能研究,结合SEM分析水泥基基体的微观特征,总结改性碳纳米管的作用机理,以及电阻率与压应力变化规律。结果表明:改性碳纳米管的掺入能大量缩短极化时间,以及有效提升试块的导电性能;电阻率随着压应力的增加而线性下降,传感器表现出了良好的压敏性能;电阻变化率随着加载幅值和加载速率的增大而增大。In order to achieve the development of intelligent sensors and real-time structural monitoring,a new type of intelligent sensor was prepared by mixing modified carbon nanotubes into cement mortar.The polarization curve analysis of the sensor,electrical resistivity analysis from loading to destruction,cyclic loading tests at different rates,and pressure sensitive performance studies at different maximum loading amplitudes were conducted using the four-electrode method.Combined with SEM analysis of the microscopic characteristics of the cement based matrix,the mechanism of action of modified carbon nanotubes and the variation of electrical resistivity and compressive stress were summarized.The results showed that the incorporation of modified carbon nanotubes can significantly shorten the polarization time,and effectively improve the electrical conductivity of the test block;the resistivity decreases linearly with the increase of compressive stress,and the sensor exhibits good pressure sensitive performance;the resistance change rate increases with the increase of loading amplitude and loading rate.

关 键 词：智能传感器 改性碳纳米管 SEM 压敏性能 线性下降 幅值 速率 

分 类 号：TU528[建筑科学—建筑技术科学]