Citation: DU Hai-Ying, WANG Jing, QIAO Qiao, SUN Yan-Hui, SHAO Qiang, LI Xiao-Gan. Synthesis and Characterization of ZnO/PPy Hetero-Nanocomposites and Their Gas Sensing Properties[J]. Acta Physico-Chimica Sinica, ;2015, 31(4): 800-806. doi: 10.3866/PKU.WHXB201501283
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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 od 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.
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