Novel surface-enhanced Raman scattering-active silver substrates containing visible light-responsible TiO2 nanoparticles

作者：Liu Yu Chuan^*; Yu Chung Chin; Wang Cheng Cai

来源：Journal of Materials Chemistry, 2007, 17(20): 2120-2124.

DOI：10.1039/b618868k

We report here the first electrochemically prepared surface-enhanced Raman scattering (SERS)active silver substrates containing visible light-responsible TiO2 nanoparticles. The SERS-active Ag substrates with TiO2 nanoparticles were prepared by roughening the substrates using electrochemical oxidation - reduction cycles (ORC) in 0.1 M HCl aqueous solutions containing 1 mM visible light-responsible TiO2 nanoparticles. Based on these prepared substrates, the SERS of Rhodamine 6G (R6G) exhibits a higher intensity by one order of magnitude, as compared with that of R6G adsorbed on a roughened Ag substrate without TiO2 nanoparticles. Moreover, the practical limit of detection (LOD) of R6G can be reduced by five orders of magnitude from 2 x 10(-10) to 2 x 10(-15) M owning to the additional contribution of TiO2 nanoparticles to the whole SERS effects.

• 出版日期2007