Synthesis and characterization of silica-silver core-shell composite particles with uniform thin silver layers |
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Authors: | Shaochun Tang |
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Affiliation: | Department of Materials Science and Engineering, National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, People's Republic of China |
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Abstract: | Silica-silver core-shell composite particles with uniform thin silver layers were successfully synthesized by a facile and one-step ultrasonic electrodeposition method. By electrolysis of the slurry consisting of preformed silica spheres and silver perchlorate without any additives, the homogenous composite particles can be prepared. The average size of single silver crystals in the composite is about 12 nm and the thickness of silver layer is 14±2 nm. Moreover, the continuity of Ag distribution, the surface roughness and the thickness of silver layer are controllable by adjusting the current density (I), the concentration of electrolyte (C) and the reaction time (t). Optical properties of the composite particles with different silver content were also investigated. |
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Keywords: | Thin silver layer Ultrasonic electrodeposition method Silica-silver composite particles Optical properties |
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