Novel method for fabrication of room temperature polypyrrole-ZnO nanocomposite NO2 sensor

作者：Chougule M A; Dalavi D S; Mali Sawanta; Patil P S; Moholkar A V; Agawane G L; Kim J H; Sen Shashwati; Patil V B^*

来源：Measurement, 2012, 45(8): 1989-1996.

DOI：10.1016/j.measurement.2012.04.023

• Gas sensitivity
• Polypyrrole
• ZnONPs
• Nanocomposites
• p-n Junction

Nanocomposites of polypyrroie (PPy) and zinc oxide (ZnO) nanoparticles (NPs) were prepared by spin coating method. These nanocomposites were characterized by Fourier transform infrared (FTIR), Field emission scanning electron microscope (SEM), Atomic force microscopy (AFM), Transmission electron microscopy (TEM), X-ray diffraction (XRD) and UV-vis techniques, which proved the polymerization of pyrrole monomer and the strong interaction between polypyrrole and ZnO NPs. The nanocomposites were used for gas sensing to CH3OH, C2H5OH, NH3, H2S and NO2 at room temperature. It was revealed that PPy-ZnO nanocomposites with different ZnO weight ratios (10%, 20%, 30%, 40% and 50%) could detect NO2 at low concentration with very higher selectivity and sensitivity at room temperature than the reported PPy. The PPy-ZnO nanocomposites responded to NO2 at concentration as low as 10 ppm. PPy-ZnO nanocomposite containing ZnO (50%) showed the maximum sensitivity 38% with 92.10% stability to 100 ppm NO2 gas at room temperature. The sensing mechanism of PPy-ZnO nanocomposites to NO2 was presumed to be the effects of p-n junction between PPy and ZnO.

• 出版日期2012-10