title: Improved surface-enhanced Raman scattering on electrochemically roughened silver substrates prepared in bielectrolyte solutions.
abstract: 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.
authors: 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>
authors: Yu-Chuan
authors: YC
authors: Liu
authors: Cheng-Cai
authors: CC
authors: Wang
authors: Jeng-Feng
authors: JF
authors: Tsai
mesh_terms: 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
chemical_list: D005456:Fluorescent Dyes; D018020:Lithium Compounds; D010472:Perchlorates; D012235:Rhodamines; D012996:Solutions; C026188:rhodamine 6G; D012834:Silver; D011189:Potassium Chloride; C054684:lithium perchlorate