表面改性对碳纳米管—水泥基复合材料导电性能及机敏性的影响  

Effect of surface treatment on volume resistance and sensing effect of carbon nanotube-reinforced cement composites

作　　者：李庚英[1] 王培铭[1] 

机构地区：[1]同济大学材料科学与工程学院

出　　处：《四川建筑科学研究》2007年第6期143-146,共4页Sichuan Building Science

摘　　要：采用一种由浓硝酸和浓硫酸组成的混合液对碳纳米管进行表面改性后分散到水泥净浆中(SPCNT),采用四电极法测试了复合材料导电性能和机敏性能,并与未改性碳纳米管增强水泥净浆(PCNT)及普通水泥净浆(PCC)进行了对比;同时采用扫描电镜观察了复合材料的微观结构。结果表明:水泥净浆中掺入碳纳米管后具有优良的导电性能和机敏性能,碳纳米管经表面改性后复合材料的体积电阻较未改性碳纳米管复合材料高,而机敏性能表现更稳定;在复合材料中碳纳米管分布非常均匀,碳纳米管之间互相搭接,形成完好的导电网络,未改性碳纳米管表面光滑未覆盖水泥水化产物,而改性碳纳米管表面被水泥水化产物包裹。Carbon nanotubes （CNTs） modified by using a H2SO4 and HNO3 mixture solution were dispersed throughout cement matrix composites （SPCNT）. Volume resistance and sensing effect in cyclic compressive loading were analyzed and compared to untreated carbon nanotube - reinforced cement composites （PCNT） and control Portland Cement Composites （PCC）, and the mlcrostructure was analyzed by using scanning electron microscope. Results show that PCNT have a lower volume resistance and a stronger sensing effect than that of PCC, and SPCNT has a higher volume resistance and a stronger sensing effect than that of PCNT. Both the treated and untreated carbon nanotubes were well dispersed and contacted each other, and a well electric meshwork was formed. The surface of untreated nanotubes was glossy, whereas the treated nanotubes were covered by C-S-H.

关 键 词：表面改性 碳纳米管水泥基材料 导电性能 机敏性能 微观结构 

分 类 号：TB302[一般工业技术—材料科学与工程]