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为了对空气中含毒性的有机气体进行检测,以1-丁基-3-甲基咪唑氯盐离子([BMIm]Cl)液体溶解棉纤维素和壳聚糖得到均相混合溶液,以十二烷基磺酸钠(SDS)改性的多壁碳纳米管(MWCNTs)为导电填料,通过溶液涂覆方法,制备了MWCNTs/天然纤维素-壳聚糖气敏导电复合材料。结果表明:当壳聚糖与棉纤维素的质量比为1∶7,MWCNTs含量在逾渗值(2.8wt%)附近时,该复合材料对甲醇、乙醇、氯仿和丙酮等极性有机溶剂蒸气显示出较好的气敏性和重复使用稳定性,其气敏响应行为表现为典型的负蒸气系数(NVC)效应。
In order to detect toxic organic gases in the air, a homogeneous mixed solution was obtained by dissolving cotton cellulose and chitosan with 1-butyl-3-methylimidazolium chloride salt ([BMIm] Cl) MWCNTs / natural cellulose-chitosan gas-sensing conductive composites were prepared by solution coating method using sodium alkylsulfonate (SDS) modified multi-walled carbon nanotubes (MWCNTs) as conductive filler. The results show that when the mass ratio of chitosan to cotton cellulose is 1: 7 and MWCNTs is around 2.8%, the composite material is sensitive to polar organic solvents such as methanol, ethanol, chloroform and acetone Shows good gas sensitivity and reusable stability, and its gas sensitive response behaves as a typical negative vapor coefficient (NVC) effect.