Journal
ANALYTICA CHIMICA ACTA
Volume 709, Issue -, Pages 91-97Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2011.10.017
Keywords
Surface-enhanced Raman scattering; Ag nanostructures; Sonoelectrochemical methods; Limit of detection
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Funding
- National Science Council of the Republic of China
- Taipei Medical University
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Generally, a controllable and reproduced surface roughness for surface-enhanced Raman scattering (SERS) studies can be generated through control of the electrochemical oxidation-reduction cycles (ORC) procedure. In this work, we propose a new sonoelectrochemical approach to prepare SERS-active substrates with two domain-Ag nanostructures. The method is based on a strategy of deposition-dissolution cycles (DDCs) by using a cathodic overpotential and an anodic overpotential from open circuit potential (OCP) in turn under sonication. The prepared SERS-active substrate demonstrates large Raman scattering enhancement for adsorbed Rhodamine 6G (R6G) with an enhancement factor of 2.3 x 10(8) and a limit of detection of 2 x 10(-13) M. The improved SERS performances can be successfully explained from the viewpoints of electromagnetic (EM) and chemical (CHEM) enhancements. (C) 2011 Elsevier B.V. All rights reserved.
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