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We report here the first electrochemical oxidation−reduction cycle procedure to roughen gold substrates in 0.1 N HCl aqueous solution containing 1 mM rutile TiO 2 nanoparticles under the irradiation of UV light. It is encouraging to find that the oxidized peak in the anodic scan, which is responsible for the surface-enhanced Raman scattering, increases significantly due to the effect of adding TiO 2 under an electric field and UV irradiation. Moreover, the SERS spectrum of polypyrrole electrodeposited on the corresponding roughened gold substrate exhibits a 5-fold higher intensity compared to that without the contribution of TiO 2 nanoparticles.
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Liu et al. (2004) studied this question.
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