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


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
  • Supported by:

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


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


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