The change of absorption spectrum of colloidal Au particles in water-ethanol solution
Journal Title: Science Paper Online - Year 2007, Vol 2, Issue 4
Abstract
Stable colloidal Au particles with mean diameter about 5nm in water solution are obtained by reduction of AuCl4- using NaBH4. The wavelength and strength of surface plasma resonance (SPR) absorption of colloidal Au particles vary with ratio of ethanol to water in the solution. This has been attributed to the change of surrounding medium around Au nanoparticles after addition of ethanol into the colloidal solution. It is found that the addition of ethanol could modify both solution dielectric function and the double-electrical layers structures of Au particles, which induces opposite effects on SPR wavelength of colloidal Au particles.
Authors and Affiliations
Chunxia Wang, Yong Wang, Shengyue Wang
Keywords
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