湿度和温度对MXene水泥基复合材料导电性能的影响

Effects of Humidity and Temperature on Electrical Conductivity of MXene Cement-Based Composites

为研究新型水泥基材料本征传感器,本文制备了二维过渡金属碳/氮化物(MXene)水泥基复合材料。利用四电极法测试复合材料的电阻率变化,研究MXene掺量、湿度、温度对电阻率的影响,并通过扫描电子显微镜(SEM)观察复合材料的微观形貌。结果表明:MXene水泥基复合材料电阻率随MXene掺量的变化符合渗流理论,相对含水量的增加和环境温度的升高均会降低其电阻率,在多次升降温循环后复合材料仍具有良好的温敏性能。SEM测试表明MXene水泥基复合材料的电阻率主要由MXene导电网络的分布和接触情况决定。

Two-dimensional transition metal carbon/nitride(MXene)cement-based composites were prepared to study a new type of cement-based material intrinsic sensor.The effects of MXene content,humidity and temperature on resistivity of composites were studied by four-electrode method.The microstructure of composites was observed by scanning electron microscope(SEM).The results show that the variation of electrical resistivity of MXene cement-based composites with content of MXene conforms to the percolation theory.The increasing of relative water content and ambient temperature decreases the electrial resistivity of composites,and composites has good temperature-sensitive performance after multiple rising and cooling cycles.SEM results show that the electrical resistivity of MXene cement-based composites is mainly determined by distribution and contact of MXene conductive network.