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Self‐assembled silver nanoparticle monolayer on glassy carbon: an approach to SERS substrate
Author(s) -
Chen Hongjun,
Wang Yuling,
Qu Jianying,
Dong Shaojun
Publication year - 2007
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1792
Subject(s) - rhodamine 6g , monolayer , substrate (aquarium) , silver nanoparticle , raman scattering , nanoparticle , nanotechnology , raman spectroscopy , materials science , molecule , chemistry , organic chemistry , optics , oceanography , physics , geology
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. Copyright © 2007 John Wiley & Sons, Ltd.