MWCNTs掺杂的PANI纳米复合材料的制备及敏感特性的研究

Preparation,characterization and gas sensitivity studies of MWCNTs-doped PANI nanocomposites

采用质子酸化学聚合法，以苯胺（An）为单体，过硫酸铵（APS）为氧化剂，在盐酸（HCl）溶液中，0。C水浴中合成了0．02％（质量分数）碳纳米管（MWCNTs）掺杂的聚苯胺（PANI）。同样方法制备了PANI和0．05％（质量分数）MWCNTs掺杂的PA—NI，分别通过X射线衍射仪（XRD）、红外光谱仪（FT—IR）和场发射扫描电镜（SEM）对其结构和形貌进行了表征，并制成了PANI及MWCNTs掺杂的PANI气敏元件。在室温下，对浓度范围（0．1～1．5）×10-4的氨气进行了气敏测试，测试结果表明，基于PANI，0．02％（质量分数）和0．05％（质量分数）MWCNT0掺杂的PANI气敏元件对氨气响应均呈线性关系。0．02％（质量分数）MWCNTs掺杂的PANI气敏元件对氨气的响应灵敏度最大，在氨气浓度为1．5×10-4时响应达到27．67；氨气浓度为1．0×10-5时响应为1．95，且元件具有良好的稳定性。最后，简要分析了MWCNTs掺杂的PANI气敏元件对氨气的敏感机理。

0. 02wt% multi-wall carbon nanotubes （MWCNTs） doped polyaniline （PANI） nanopowders were prepared by chemical polymerization of protonic acid method in 0℃ water bath. The PANI and 0. 05wt% MWCNTs-doped PANI nanopowders were prepared by the same way. The morphology and structure of PANI, MWCNTs-doped PANI nanopowders were analyzed by XRD, FT-IR and SEM. Gas sensors were fabricated based on PANI, 0.02wt% MWCNTs-doped PANI and 0.05wt% MWCNTs-doped PANI. The response sensi tivity of gas sensors to NHs was measured in NH3 concentration range of （0. 1-1. 5） × 10 4. The response curves of three gas sensors were basically linearity. The response sensitivity of the gas sensor based on 0.02wt% MWCNTs-doped PANI was the highest, the responses were 27.65 and 1.94 for 1.5×10 4 NHa and 1.0×10 s NHs, respectively. The stability of the gas sensor based on 0.02wt% MWCNTs-doped PANI was tested, and the sensor showed good stability in three months. The sensing mechanism of MWCNTs-doped PA- NI gas sensor was analyzed.