Surface enhanced Raman scattering of trans-3-hydroxycinnamic acid adsorbed on silver nanoparticles

authors	Sardo, M; Ruano, C; Castro, JL; Lopez-Tocon, I; Ribeiro-Claro, PJA; Otero, JC
nationality	International
journal	CHEMICAL PHYSICS LETTERS
keywords	CHARGE-TRANSFER MECHANISM; RESONANCE RAMAN; SELECTION-RULES; SPECTROSCOPY; ELECTRODE; PYRIDINE; COMPLEX; STATES
abstract	SERS of trans-3-hydroxycinnamic acid adsorbed on silver colloids have been analyzed in order to detect resonant charge transfer processes similar to a resonance Raman mechanism, involving the photoinduced transfer of an electron from the metal to the adsorbate (SERS-CT). Theoretical SERS-CT intensities for the neutral, anionic and dianionic forms have been calculated and it was found that the active SERS species corresponds to cinnamate ion linked to the metal through its carboxylate group. Moreover, it has been shown that the SERS-CT mechanism is operating in the SERS, explaining the strong enhancement of the band at ca. 1600 cm (1), assigned to the 8a mode. (C) 2008 Elsevier B.V. All rights reserved.
publisher	ELSEVIER SCIENCE BV
issn	0009-2614
year published	2008
volume	467
issue	1-3
beginning page	101
ending page	104
digital object identifier (doi)	10.1016/j.cplett.2008.10.083
web of science category	Chemistry, Physical; Physics, Atomic, Molecular & Chemical
subject category	Chemistry; Physics
unique article identifier	WOS:000261407000022