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Erschienen in:
01.05.2014
Facile fabrication of highly dispersed silver spheres with controllable sizes in the presence of gelatin
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 5/2014
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Abstract
The size-controlled synthesis of micro-size silver spheres is demonstrated in a green and environmentally friendly approach. In this paper, the commercial reagent ascorbic acid (Vc) serves as a reducing agent for Ag+ ions, while the gelatin is the stabilizer of the generated silver spheres. The pH value of the solution is adjusted by the addition of nitric acid. It is found that highly dispersed silver spheres with high tap density (4.9 g/cm3) can be obtained in 15 min. The as-prepared silver spheres are investigated by electron microscopy. Some other parameters, such as the Vc concentration, the gelatin concentration and temperature, also have been discussed. A possible mechanism is put forward to understand the evolution of silver spheres. This method provides a cost-effective and simple way to synthesize silver spheres in large-scale used for the solar cell electronic paste.