Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 4, Issue 9, Pages 4700-4707Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am3017366
Keywords
surface-enhanced Raman scattering mechanisms; electrochemical method; Au/SiO2 nanocomposites; sonoelectrochemical methods
Funding
- National Science Council of the Republic of China
- Taipei Medical University
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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 SiO2 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/SiO2 nanocomposites (NCs) with an enhancement factor of 5.4 X 10(8). Experimental results indicate that pH value of solution and addition of SiO2 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/SiO2 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.
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