Abstract
Many methods have been reported in the literature to improve signals and stabilities of surface-enhanced Raman scattering (SERS) for their reliable applications. In this work, we propose a new pathway to prepare SERS-active substrates with Au/TiO2 nanocomposites (NCs) by electrochemical methods to achieve these goals. First, Au substrate was treated by electrochemical oxidation-reduction cycles (ORCs) in a solution containing 0.1 M HCl and 1 mM TiO2 nanoparticles (NPs). Subsequently, the Au substrate was immediately replaced by Pt substrate, and a cathodic overpotential of 0.6 V was applied under sonication to prepare SERS-active Au/TiO2 NCs on the Pt substrate. Experimental results indicate that the SERS enhancement capability of the Au/TiO2 NCs-deposited Pt substrate is seriously destroyed only at temperature higher than 225 °C. Also, aging of the SERS effect in 50% RH and 20% (v/v) O2 at 30 °C is slight based on this substrate. Conclusively, the stabilities of the developed SERS-active substrates are satisfactory.
Original language | English |
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Pages (from-to) | 12863-12869 |
Number of pages | 7 |
Journal | Journal of Physical Chemistry C |
Volume | 114 |
Issue number | 30 |
DOIs | |
Publication status | Published - Aug 5 2010 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- General Energy
- Surfaces, Coatings and Films
- Physical and Theoretical Chemistry