Surface-enhanced Raman scattering-active Au/SiO 2 nanocomposites prepared using sonoelectrochemical pulse deposition methods

Chun Chao Chang, Kuang Hsuan Yang, Yu Chuan Liu, Ting Chu Hsu, Fu Der Mai

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

For improving signals, reproducibility, and stabilities of surface-enhanced Raman scattering (SERS), numerous technologies have recently been reported in the literature. However, the fabrication processes are usually complicated. It is well-known that nanoparticles (NPs) of Au and SiO 2 are SERS active and inactive materials, respectively. In this work, a simple synthesis route based on sonoelectrochemical pulse deposition (SEPD) methods has been developed to synthesize effectively SERS-active Au/SiO 2 nanocomposites (NCs) with an enhancement factor of 5.4 × 10 8. Experimental results indicate that pH value of solution and addition of SiO 2 NPs before and after oxidation-reduction cycles (ORCs) can significantly influence the corresponding SERS activities. Encouragingly, the SERS of Rhodamine 6G (R6G) adsorbed on the developed Au/SiO 2 NCs exhibits a higher intensity by more than 1 order of magnitude, as compared with that of R6G adsorbed on Au NPs synthesized using the same method. Moreover, this improved SERS activity is successfully verified from the mechanisms of electromagnetic (EM) and chemical (CHEM) enhancements.

Original languageEnglish
Pages (from-to)4700-4707
Number of pages8
JournalACS Applied Materials and Interfaces
Volume4
Issue number9
DOIs
Publication statusPublished - Sep 26 2012

Keywords

  • Au/SiO nanocomposites
  • electrochemical method
  • mechanisms
  • sonoelectrochemical methods
  • surface-enhanced Raman scattering

ASJC Scopus subject areas

  • Materials Science(all)

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