Acta Phys. -Chim. Sin. ›› 2015, Vol. 31 ›› Issue (4): 800-806.doi: 10.3866/PKU.WHXB201501283

• PHYSICAL CHEMISTRY OF MATERIALS • Previous Articles    

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).

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