Simple method to prepare size-controllable gold nanoparticles in solutions and their applications on surface-enhanced Raman scattering

Chung Chin Yu, Yu Chuan Liu, Kuang Hsuan Yang, Hui Yen Tsai

研究成果: 雜誌貢獻文章

6 引文 斯高帕斯(Scopus)

摘要

We report here, for the first time, a simple method to prepare size-controllable Au nanoparticles (NPs) in aqueous solutions from bulk Au substrates. First, chitosan (Ch)-capped Au-containing complexes were prepared by electrochemical oxidation-reduction cycles in 0.1 N NaCl and 1 g/l Ch solutions. Then the solutions were heated from room temperature to boiling at different heating rates to synthesize size-controllable Au NPs. The particle sizes of the prepared Au(111) NPs could be controlled from 5 to 30 nm with an increase of the heating rate during preparation. Experimental results indicate that the prepared Au(111) NPs with diameters ranging from 10 to 30 nm can serve as surface-enhanced Raman scattering active probes for molecules of rhodamine 6G. These SERS spectra exhibit two competitive effects. One is the fluorescence from R6G dissolved in the aqueous solution. The other is SERS from R6G adsorbed on Au NPs, where SERS becomes more dominant for R6G adsorbed on larger NPs.

原文英語
頁(從 - 到)621-625
頁數5
期刊Journal of Raman Spectroscopy
42
發行號4
DOIs
出版狀態已發佈 - 四月 2011

ASJC Scopus subject areas

  • Spectroscopy
  • Materials Science(all)

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