Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 10, Issue 4, Pages 625-629Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2008.01.040
Keywords
electroless deposition; silver dendrites; thin porous silicon; photoluminescence; surface-enhanced Raman scattering (SERS)
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Via electroless metal deposition, well-defined silver dendrites and thin porous silicon (por-Si) layers are simultaneously prepared in ammonia fluoride solution containing AgNO3 at 50 degrees C. A self-assembled localized microscopic electrochemical cell model and a diffusion-limited aggregation mode are used to explain the growth of silver dendrites. The formation of silver dendritic nanostructures derives from the continuous aggregation growth of small particles on a layer of silver nanoparticles or nanoclusters (Volmer-Weber layer). Thin and homogeneous nanostructure por-Si layers display visible light-emission properties at room temperature. The investigation of the surface-enhanced Raman scattering (SERS) reveals that the film of silver dendrites on por-Si is an excellent substrate with significant enhancement effect. (C) 2008 Elsevier B.V. All rights reserved.
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