Surface-induced photoreaction of 4-nitrobenzenethiol on silver: influence of SERS-active sites

✍ Scribed by Seung Joon Lee; Kwan Kim

• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 269 KB
• Volume: 378
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/s0009-2614(03)01269-7

✦ Synopsis

We have examined how much the photolysis of 4-nitrobenzenethiol (4-NBT) to 4-aminobenzenethiol on Ag by visible light is affected by the nano-and atomic-scale roughness features of silver which are deeply associated with the electromagnetic (EM) and chemical (CHEM) enhancement mechanisms, respectively, in surface-enhanced Raman scattering. Both the CHEM and EM sites were indeed involved in the surface-induced photoreaction of 4-NBT on Ag, and the contribution of EM-sites to the overall photolysis appeared to be as much as $65%. These findings are in conformity with the fact that the photoelectron emission is strongly affected by the extent of the roughening specifically for Ag, which has a quite low oxidation potential.