镍纳米纤维/碳纳米管增强水泥基材料的电学性能与压敏性能  

Electrical and piezoresistive properties of Ni nanofibers/carbon nanotubes cement-based materials

作　　者：刘力源 徐金霞[1] 殷天娇 储洪强[1] LIU Liyuan;XU Jinxia;YIN Tianjiao;CHU Hongqiang(College of Materials and Mechanics,Hohai University,Nanjing 210098,China)

机构地区：[1]河海大学力学与材料学院,江苏南京210098

出　　处：《混凝土》2021年第12期89-93,96,共6页Concrete

基　　金：国家自然科学基金面上资助项目(51478164,52079048);江苏省自然科学基金资助项目(BK20181306)。

摘　　要：通过复掺镍纳米纤维、碳纳米管制备了镍纳米纤维/碳纳米管增强水泥基复合材料,研究了其导电性及压敏性,并与单掺碳纳米管增强水泥基材料进行了对比。水泥基材料导电性用四电极伏安法进行测试,微观形貌用扫描电子显微镜(SEM)进行观察,并探讨了镍纳米纤维/碳纳米管增强水泥基材料的性能提升机理,结果表明:镍纳米纤维、碳纳米管在水泥基材料中分散良好;镍纳米纤维加入碳纳米管水泥基材料中,可降低电阻率,最高可降低50%;混掺镍纳米纤维/碳纳米管水泥基材料比碳纳米管水泥基材料具有更稳定的敏感性,灵敏度最高可达1880,更适用于混凝土结构应力监测的传感元件。Ni nanofiber/carbon nanotube reinforced cement-based composite was prepared by adding Ni nanofiber and carbon nanotube.Its conductivity and pressure sensitivity were studied and compared with that of single carbon nanotube reinforced cement-based composite.The conductivity of cement-based materials was measured by four electrode voltammetry,and the micro morphology was observed by scanning electron microscope(SEM).The mechanism of performance improvement of cement-based materials reinforced by Ni nanofibers/carbon nanotubes was discussed.The results show that Ni nanofibers and carbon nanotubes are well dispersed in cement-based materials.Ni nanofibers added to carbon nanotubes cement-based materials can reduce resistivity that can be reduced by 50%at most,and the cement-based materials mixed with Ni nanofibers/carbon nanotubes have more stable sensitivity than the cement-based materials mixed with carbon nanotubes,with the sensitivity up to 1880,high linearity and good repeatability,which are more suitable for the sensing elements of stress monitoring of concrete structures.

关 键 词：水泥基传感器 镍纳米纤维 碳纳米管 导电性 压敏性 

分 类 号：TU528.041[建筑科学—建筑技术科学]