物理化学学报 >> 2015, Vol. 31 >> Issue (4): 800-806.doi: 10.3866/PKU.WHXB201501283

材料物理化学 上一篇    

ZnO/PPy异质纳米复合材料的制备、表征及其气敏特性

杜海英1,2, 王兢1, 乔俏1, 孙炎辉1,2, 邵强2, 李晓干1   

  1. 1 大连理工大学电子科学与技术学院, 辽宁大连116023;
    2 大连民族学院机电信息工程学院, 辽宁大连116600
  • 收稿日期:2014-12-12 修回日期:2015-01-27 发布日期:2015-04-03
  • 通讯作者: 王兢 E-mail:wangjing@dlut.edu.cn
  • 基金资助:

    国家自然科学基金(61176068, 61131004, 61474012)资助项目

Synthesis and Characterization of ZnO/PPy Hetero-Nanocomposites and Their Gas Sensing Properties

DU Hai-Ying1,2, WANG Jing1, QIAO Qiao1, SUN Yan-Hui1,2, SHAO Qiang2, LI Xiao-Gan1   

  1. 1 School of Electronic Science and Technology, Dalian University of Technology, Dalian 116023, Liaoning Province, P. R. China;
    2 College of Electromechanical & Information Engineering, Dalian Nationalities University, Dalian 116600, Liaoning Province, P. R. China
  • Received:2014-12-12 Revised:2015-01-27 Published:2015-04-03
  • Contact: WANG Jing E-mail:wangjing@dlut.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (61176068, 61131004, 61474012).

摘要:

室温下, 采用原位聚合法, 以吡咯(PY)为单体, 氯化铁(FeCl3·6H2O)为氧化剂, 在塑料基片上聚合生长了聚吡咯(PPy)纳米微球. 然后在聚吡咯基片上生长ZnO种子, 将表面种有ZnO种子的PPy元件置于六次甲基四胺与硝酸锌的混合溶液中, 90 ℃水浴中, 在PPy微球上生长了ZnO纳米棒, 合成了PPy/ZnO异质纳米复合材料. 分别通过X射线衍射仪(XRD)和场发射扫描电镜(FESEM)对PPy/ZnO异质纳米复合材料的结构和形貌进行了表征. 制备了塑料基的PPy/ZnO异质纳米复合材料气体传感器, 在室温下, 对10×10-6-150×10-6 (体积分数)浓度范围的氨气进行了气敏测试, PPy/ZnO气敏元件对氨气响应的灵敏度基本呈线性关系, 且对甲醇、丙酮、甲苯等有机气体表现出很好的选择性. 最后, 对PPy/ZnO异质纳米复合材料的形成机理进行了简要分析.

关键词: 原位聚合法, 异质纳米复合物, 气体传感器, 气敏特性, 形成机理

Abstract:

Pyrrole (Py) was oxidized by ferric(III) chloride solution in water for the synthesis of polypyrrole (PPy) nanoparticles on the substrate slide by in-situ polymerization at room temperature. Zinc oxide nanorods grew on the PPy nanoparticles when in a water bath at 90 ℃. ZnO/PPy hetero-nanocomposites were obtained by a hydrothermal method and characterized using X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). Gas sensors were fabricated based on the ZnO/PPy hetero-nanocomposites to detect ammonia at room temperature. The gas sensing properties of these hetero-nanocomposites were measured in the concentration range of 10×10-6-150×10-6 (volume fraction). The relationship of the sensitivity of the sensors to the ammonia concentration showed linearity. The gas sensor based on ZnO/PPy heteronanocomposites showed good selectivity to ammonia when in the presence of interfering gases such as methanol, acetone, and toluene. The formation mechanism of the ZnO/PPy hetero-nanocomposites was briefly analyzed.

Key words: In-situ polymerization, Hetero-nanocomposite, Gas sensor, Gas sensing property, Formation mechanism

MSC2000: 

  • O649