量子隧道效应压敏复合材料  

Piezoresistive composites based on quantum tunneling effect

作　　者：韩宝忠[1] 张灵燕[2] 韩宝国[2] 刘凌云[2] 胡张雄[2] 

机构地区：[1]哈尔滨理工大学电气与电子工程学院,黑龙江哈尔滨150040 [2]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090

出　　处：《功能材料》2008年第6期931-934,共4页Journal of Functional Materials

基　　金：国家高技术研究发展计划(863计划)资助项目(2002AA335010);中国博士后科学基金资助项目(20060390803)

摘　　要：为探讨镍粉-水泥基复合材料的压敏性及其产生机理,首先验证了采用埋入式环状四电极进行镍粉-水泥基复合材料电阻测试的可行性,然后探讨了镍粉-水泥基复合材料的伏安特性,最后研究了一次加载至破坏时和弹性加载阶段镍粉-水泥基复合材料的电阻率变化规律。研究结果表明:基于埋入式环状电极的四电极法适用于镍粉-水泥基复合材料压敏性的测试;在测试电流<10mA时,镍粉-水泥基复合材料的伏-安特性为线性,隧道导电具有欧姆特性;镍粉-水泥基复合材料一次加载至破坏,电阻率变化率最大达70%,弹性阶段电阻率变化率可达60%以上,量子隧道效应是致使其具有优异压敏性能的原因。In order to explore the piezoresistivity of nickel powder cement-based composites and its generation mechanism, the feasibility of measuring the electrical resistance of nickel powder cement-based composites by using the four electrode method based on the embedded loop electrode was firstly verified, and then the voltagecurrent characteristic of nickel powder cement-based composites was studied. The variation regularity of electrical resistivity of these composites under single compressive loading and within elastic regime was respectively investigated finally. The research results show that the four electrode method based on the embedded loop electrode is feasible for measuring the piezoresistivity of nickel powder cement-based composites. The voltage-current characteristic of nickel powder cement-based composites is linear when the test current is lower than 10mA, which indicates quantum conduction of these composites possesses ohmic characteristic. The fractional change in electrical resistivity of nickel powder cement-based composites goes up to 70% and 60% maximum under single compressive loading and within the elastic regime respectively. These findings suggest that nickel powder cement-based composites present favorable piezoresistivity, which results from the quantum tunneling effect.

关 键 词：镍粉 水泥基复合材料 压敏性 量子隧道效应 

分 类 号：TB333[一般工业技术—材料科学与工程] TU528[建筑科学—建筑技术科学]