Self-assembled silver nanoparticle monolayer on glassy carbon: An approach to SERS substrate

Hongjun Chen, Yuling Wang, Jianying Qu, Shaojun Dong*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

Abstract

In this paper, the fabrication of an active surface-enhanced Raman scattering (SERS) substrate by self-assembled silver nanoparticles on a monolayer of 4-aminophenyl-group-modified glassy carbon (GC) is reported. Silver nanoparticles are attached to the substrate through the electrostatic force between the negatively charged silver nanoparticles and the positively charged 4-aminophenyl groups on GC. The active SERS substrate has been characterized by means of tapping-mode atomic force microscopy (AFM), indicating that large quantities of silver nanoparticles are uniformly coated on the substrate. Rhodamine 6G (R6G) and p-aminothiophenol (p-ATP) are used as the probe molecules for SERS, resulting in high sensitivity to the SERS response, with the detection limit reaching as low as 10-9 M. This approach is easily controlled and reproducible, and more importantly, can extend the range of usable substrates to carbon-based materials for SERS with high sensitivity.

Original languageEnglish
Pages (from-to)1444-1448
Number of pages5
JournalJournal of Raman Spectroscopy
Volume38
Issue number11
DOIs
Publication statusPublished - Nov 2007
Externally publishedYes

Keywords

  • Glassy carbon
  • P-aminothiophenol
  • R6G
  • SERS
  • Silver nanoparticle

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