Improved surface-enhanced Raman scattering on electrochemically roughened silver substrates prepared in bielectrolyte solutions.
In this work, the effect of supplemental LiClO(4) electrolytes in KCl solutions used in roughening silver substrates by electrochemical triangular-wave oxidation-reduction cycles (ORC) on surface-enhanced Raman scattering (SERS) was first investigated. To prepare SERS-active substrates by ORC procedures, electrolytes of KCl were generally employed. In contrast, LiClO(4) ones were unsuitable for producing SERS-active substrates. Encouragingly, SERS of Rhodamine 6G (R6G) adsorbed on the roughened Ag substrate prepared in an aqueous solution containing KCl and LiClO(4) electrolytes exhibits a higher intensity by one order of magnitude, as compared with that of R6G adsorbed on a roughened Ag substrate prepared in a solution only containing KCl. Further investigations indicate that the oxidation state of Cl on the roughened Ag substrate demonstrates decided effects on this improved SERS.
Liu
Yu-Chuan
YC
Department of Chemical and Materials Engineering, Vanung University, 1 Van Nung Road, Shuei-Wei Li, Chung-Li City, Taiwan. liuyc@msa.vnu.edu.tw <liuyc@msa.vnu.edu.tw>
Wang
Cheng-Cai
CC
Tsai
Jeng-Feng
JF
D000327:Adsorption; D004563:Electrochemistry; D005456:Fluorescent Dyes; D018020:Lithium Compounds / Q000737:chemistry*; D010472:Perchlorates / Q000737:chemistry*; D011189:Potassium Chloride / Q000737:chemistry*; D012235:Rhodamines; D012834:Silver / Q000737:chemistry*; D012996:Solutions; D013059:Spectrum Analysis, Raman; D013499:Surface Properties
D005456:Fluorescent Dyes; D018020:Lithium Compounds; D010472:Perchlorates; D012235:Rhodamines; D012996:Solutions; C026188:rhodamine 6G; D012834:Silver; D011189:Potassium Chloride; C054684:lithium perchlorate