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Improved surface‐enhanced Raman scattering of polypyrrole electrodeposited on roughened substrates composed of Au–Ag bimetallic nanoparticles
Author(s) -
Chuang Thomas C.,
Liu YuChuan,
Wang CheeChan
Publication year - 2005
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.1363
Subject(s) - bimetallic strip , polypyrrole , raman scattering , materials science , substrate (aquarium) , scanning electron microscope , nanoparticle , colloidal gold , raman spectroscopy , chemical engineering , silver nanoparticle , aqueous solution , electrochemistry , nanotechnology , electrode , chemistry , composite material , metallurgy , metal , optics , organic chemistry , physics , oceanography , engineering , geology
We report here the first electrochemical method to prepare a roughened gold substrate with bimetallic silver and gold nanoparticles. First, a silver substrate was roughened by a triangular‐wave oxidation–reduction cycle in 0.1 N HCl aqueous solutions. Silver‐containing complexes were found in the solution after the ORC treatment. Then a gold substrate was subsequently roughened by a similar oxidation–reduction treatment in this solution. Scanning electron microscopy and atomic force microscopy reveal that the surface of the roughened gold was intrinsically modified with silver nanoparticles, which demonstrates two different kinds of deposition domains. Encouragingly, surface‐enhanced Raman scattering of polypyrrole electrodeposited on the roughened gold substrate, modified with finer silver nanoparticles, exhibits an eightfold higher intensity. Copyright © 2005 John Wiley & Sons, Ltd.