摘要
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.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2013年第20期3024-3029,共6页
Journal of Functional Materials
基金
国家自然科学基金资助项目(61176068
61131004)
大连民族学院自主科研基金资助项目(DC12010301)