水性环氧树脂基石墨烯传感元件制备及其机敏特性  

Preparation of waterborne epoxy resin based graphene sensor and its smart properties

作　　者：吴志强 陈利 卫军[3] 田甜 WU Zhiqiang;CHEN Li;WEI Jun;TIAN Tian(College of Architecture and Civil Engineering,Xinyang Normal University,Xinyang 464000,China;Henan New Environmentally-Friendly Civil Engineering Materials Engineering Research Center,Xinyang Normal University,Xinyang 464000,China;College of Civil Engineering,Central South University,Changsha 410075,China)

机构地区：[1]信阳师范大学建筑与土木工程学院,河南信阳464000 [2]信阳师范大学河南省新型环保土木工程材料工程研究中心,河南信阳464000 [3]中南大学土木工程学院,湖南长沙410075

出　　处：《信阳师范大学学报(自然科学版)》2025年第1期72-79,共8页Journal of Xinyang Normal University(Natural Science Edition)

基　　金：国家自然科学基金项目(51778628);河南省科技攻关项目(222102210241)。

摘　　要：为适应工程结构智能化转型升级对新型传感器的需求,以水性环氧树脂(WER)为基体,还原氧化石墨烯(RGO)为导电填料,纳米纤维素(CNF)为分散剂,采用溶液共混法,制备了RGO-CNF/WER传感元件,对其力学、电学和机敏性能进行了测试和分析,并建立了考虑应变率效应的机敏响应模型。结果表明:CNF能有效搭载RGO在水中均匀分散,协助其在WER中形成三维导电网络,RGO逾渗阈值约为0.15%。传感元件能承受超过70%的拉伸应变,初始的应变电阻响应不稳定,经过4次预拉伸后导电网络趋于完善,呈现较好的可重复和可回复性。当传感元件应变小于4%,电阻变化率与应变正线性相关,灵敏系数可达32;应变大于4%后,电阻变化率呈指数型增大,应变电阻响应强度随应变率的增大而增大。To meet the demand for new sensors in the intelligent transformation and upgrading of engineering structures,using waterborne epoxy resin(WER)as the matrix,reduced graphene oxide(RGO)as the conductive filler,and cellulose nanofiber(CNF)as the dispersant,RGO-CNF/WER sensor was prepared using a solution blending method.The mechanical,electrical and smart properties were tested and analyzed,and a smart response model considering strain rate effects was established.The results indicated that CNF can effectively carry RGO for uniform dispersion in water,assisting in the formation of a three-dimensional conductive network in WER.The percolation threshold of RGO is about 0.15%.The sensor can withstand over 70%tensile strain,and its initial strain resistance response is unstable.After about 4 pre-stretching cycles,the conductive network tends to be perfected,showing good repeatability and recoverability.When the strain of the sensor is less than 4%,the resistance change rate is positively correlated with the strain,and the sensitivity coefficient can reach 32.After the strain exceeds 4%,the resistance change rate increases exponentially.The response strength of strain resistance increases with the increase of strain rate.

关 键 词：石墨烯 水性环氧树脂 传感元件 机敏性能 纳米纤维素 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TU599[自动化与计算机技术—控制科学与工程]