Fabrication and characterization of SERS-active silver clusters on glassy carbon

Wang, Yuling, Chen, Hongjun, Dong, Shaojun and Wang, Erkang (2007) Fabrication and characterization of SERS-active silver clusters on glassy carbon. Journal of Raman Spectroscopy, 38 5: 515-521. doi:10.1002/jrs.1674

Author Wang, Yuling
Chen, Hongjun
Dong, Shaojun
Wang, Erkang
Title Fabrication and characterization of SERS-active silver clusters on glassy carbon
Journal name Journal of Raman Spectroscopy   Check publisher's open access policy
ISSN 0377-0486
Publication date 2007-05
Year available 2006
Sub-type Article (original research)
DOI 10.1002/jrs.1674
Open Access Status Not yet assessed
Volume 38
Issue 5
Start page 515
End page 521
Total pages 7
Place of publication Chichester, West Sussex, United Kingdom
Publisher John Wiley & Sons
Language eng
Formatted abstract
In this article, a novel technique for the fabrication of surface enhanced Raman scattering (SERS) active silver clusters on glassy carbon (GC) has been proposed. It was found that silver clusters could be formed on a layer of positively charged poly(diallyldimethylammonium) (PDDA) anchored to a carbon surface by 4-aminobenzoic acid when a drop containing silver nanoparticles was deposited on it. The characteristics of the obtained silver clusters have been investigated by atomic force microscopy (AFM), SERS and an SERS-based Raman mapping technique in the form of line scanning. The AFM image shows that the silver clusters consist of several silver nanoparticles and the size of the clusters is in the range 80-100 nm. The SERS spectra of different concentrations of rhodamine 6G (R6G) on the silver clusters were obtained and compared with those from a silver colloid. The apparent enhancement factor (AEF) was estimated to be as large as 3.1 × 104 relative to silver colloid, which might have resulted from the presence of 'hot-spots' at the silver clusters, providing a highly localized electromagnetic field for the large enhancement of the SERS spectra of R6G. The minimum electromagnetic enhancement factor (EEF) is estimated to be 5.4 × 107 by comparison with the SERS spectra of R6G on the silver clusters and on the bare GC surface. SERS-based Raman mapping technique in the form of line scanning further illustrates the good SERS activity and reproducibility on the silver clusters. Finally, 4-mercaptopyridine (4-Mpy) was chosen as an analyte and the lowest detected concentration was investigated by the SERS-active silver clusters. A concentration of 1.6 × 10-10 M 4-Mpy could be detected with the SERS-active silver clusters, showing the great potential of the technique in practical applications of microanalysis with high sensitivity. 
Keyword 4-mercaptopyridine
Glassy carbon
Silver clusters
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Australian Institute for Bioengineering and Nanotechnology Publications
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Citation counts: TR Web of Science Citation Count  Cited 30 times in Thomson Reuters Web of Science Article | Citations
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