Improved surface-enhanced Raman scattering on electrochemically roughened silver substrates prepared in bielectrolyte solutions

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• 作者：Yu-Chuan Liu ; Cheng-Cai Wang ; Jeng-Feng Tsai
• 关键词：Surface-enhanced Raman scattering ; Silver Substrates ; Electrolytes
• 刊名：Analytica Chimica Acta
• 出版年：2007
• 期刊代码：2_00032670
• 类别：ch
• 出版时间：19 February 2007
• 卷：584
• 期：2
• 页码：433-438
• 文件大小：631 K

摘要

In this work, the effect of supplemental LiClO₄ 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, LiClO₄ 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 LiClO₄ 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.