Metal particle size effects in the dielectric response of metal-insulator composites |
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| Affiliation: | 1. High Voltage and Dielectric Materials Lab., Electrical Engineering Department, Faculty of Engineering, Menoufia University, Shebin El_Kom, 32511, Egypt;2. Faculty of Industrial Technology and Energy, Delta Technological University, Quwaysna, 32631, Egypt;3. Electrical Engineering Department, Faculty of Engineering, Kafr El-Sheikh University, Kafr El-Sheikh, Egypt;1. School of Electric Power, South China University of Technology, Guangzhou 510640, China;2. Maintenance Branch Company, State Grid Jiangsu Electric Power Co., Ltd, Nanjing 211102, China |
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| Abstract: | Metal-insulator composites consisting of nanometer-sized Au particles in a SiO2 matrix were prepared by a novel technique which, for the first time, allows for control of metal particle size independent of metal volume fraction. Electron energy loss and optical studies show that the effective dielectric function (EDF) of these composites depends not only on metal volume fraction, but also on metal particle size. These results can not be explained by current effective dielectric function theories with size-independent metal dielectric function. However, quantum size effects partly account for the size-dependent properties of these composites. |
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