Open AccessSurface-Enhanced Raman Spectroscopy Assisted by Radical Capturer for Tracking of Plasmon-Driven Redox Reaction
Author(s) -
Xuefeng Yan,
Lingzhi Wang,
Xianjun Tan,
Baozhu Tian,
Jinlong Zhang
Publication year - 2016
Publication title -
scientific reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.24
H-Index - 213
ISSN - 2045-2322
DOI - 10.1038/srep30193
Subject(s) - photochemistry , redox , raman spectroscopy , surface enhanced raman spectroscopy , surface plasmon resonance , photocatalysis , spectroscopy , catalysis , materials science , radical , plasmon , resonance raman spectroscopy , chemistry , nanoparticle , nanotechnology , optoelectronics , raman scattering , inorganic chemistry , optics , physics , organic chemistry , quantum mechanics
The deep understanding about the photocatalytic reaction induced by the surface plasmon resonance (SPR) effect is desirable but remains a considerable challenge due to the ultrafast relaxation of hole-electron exciton from SPR process and a lack of an efficient monitoring system. Here, using the p-aminothiophenol (PATP) oxidation SPR-catalyzed by Ag nanoparticle as a model reaction, a radical-capturer-assisted surface-enhanced Raman spectroscopy (SERS) has been used as an in-situ tracking technique to explore the primary active species determining the reaction path. Hole is revealed to be directly responsible for the oxidation of PATP to p, p′-dimercaptoazobenzene (4, 4′-DMAB) and O 2 functions as an electron capturer to form isolated hole. The oxidation degree of PATP can be further enhanced through a joint utilization of electron capturers of AgNO 3 and atmospheric O 2 , producing p-nitrothiophenol (PNTP) within 10 s due to the improved hole-electron separation efficiency.