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Transport and optical properties of SiO2-polypyrrole nanocomposites

机译:SiO2-聚吡咯纳米复合材料的传输和光学性质

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Conducting polypyrrole-wide band gap semiconducting silica (SiO2) nanocomposites are prepared by polymerizing pyrrole in the presence of colloidal silicon oxide sol. The nanocomposites are characterized by Fourier transform infrared spectrometer and scanning electron microscope. Three dimensional variable range hopping conduction process is involved in electric conduction. The current density (J) satisfies the power law, J proportional to V-m, with 1 < m < 2 at voltage V > 0.5 V. Optical absorption spectra reveal that the pi-pi* transition of polypyrrole shifts from 3.9 eV to 4.58 eV with increase of silica concentration. (c) 2006 Elsevier Ltd. All rights reserved.
机译:通过在胶态氧化硅溶胶存在下聚合吡咯来制备导电聚吡咯宽带隙半导体二氧化硅(SiO2)纳米复合材料。通过傅立叶变换红外光谱仪和扫描电子显微镜对纳米复合材料进行表征。导电涉及三维可变范围跳变传导过程。电流密度(J)满足幂律J,与Vm成正比,在电压V> 0.5 V时为1

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