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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Optical and electrical properties of kaolinite/polystyrene composite
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Optical and electrical properties of kaolinite/polystyrene composite

机译：高岭石/聚苯乙烯复合材料的光电性能

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摘要

The optical and electrical characteristics of kaolinite/polystyrene composites containing 20 wt% kaolinite with grain sizes of 63, 106, 212 and 300 μm and neat polystyrene were studied. The optical absorption spectra were collected in the wavelength range 300-800 nm using a spectrophotometer. The optical band gap and energy tail widths of localized states were determined for the prepared composites. It was found that the optical energy gap and the energy tail width vary with the kaolinite grain size. The electrical properties were studied using ac impedance measurements performed at different temperatures and frequency range 100 kHz-1 MHz. Impedance, dielectric constant, dielectric loss and ac conductivity showed frequency and temperature dependence. The relaxation time and thermal activation energy of the electrical conduction vary with kaolinite grain sizes and temperature. The universal power law of the ac conductivity behaviour is satisfied for different grain sizes and at different temperatures.
机译：研究了粒径为63、106、212和300μm的20％（重量）高岭石与纯聚苯乙烯的高岭石/聚苯乙烯复合材料的光学和电学特性。使用分光光度计在300-800nm的波长范围内收集光吸收光谱。确定了制备的复合材料的光学带隙和局部态的能量尾部宽度。发现光能隙和能量尾部宽度随高岭石晶粒尺寸而变化。使用在不同温度和100 kHz-1 MHz频率范围内进行的交流阻抗测量研究了电性能。阻抗，介电常数，介电损耗和交流电导率显示出频率和温度依赖性。导电的弛豫时间和热活化能随高岭石晶粒尺寸和温度而变化。交流电导率行为的通用幂律可满足不同晶粒尺寸和不同温度的要求。

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