Journal
CHEMCATCHEM
Volume 7, Issue 6, Pages 1004-1010Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.201403032
Keywords
photochemistry; Raman spectroscopy; reaction mechanisms; silver; surface plasmon resonance
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Funding
- Natural Science Foundation of China [21471039, 21203045, 21101041]
- China Postdoctoral Science Foundation [2014M560253]
- Fundamental Research Funds for the Central Universities [HIT.BRETIII.201223]
- Open Foundation of State Key Laboratory of Electronic Thin Films and Integrated Devices [KFJJ201401]
- Laboratory Directed Research Development (LDRD) program, Los Alamos National Laboratory
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We demonstrate the plasmon-driven catalytic reactions of 4-nitrothiophenol (4NTP) on a single Ag microsphere by an insitu surface-enhanced Raman spectroscopy (SERS) technique. The highly SERS-active hierarchical Ag structures served as an ideal platform to study plasmon-driven catalytic reactions. This single-particle surface-enhanced Raman spectroscopy (SP-SERS) technique coupled with inbuilt apparatus allow us to study the impact of reaction atmospheres and laser power on the rate of dimerization and reduction of 4NTP. Contrary to that found in previous studies, 4NTP could be transformed into 4-aminothiophenol under H2O or H-2 atmosphere. The broadening and splitting of the (CC) band during the reaction results from the frequency shift of the (CC) band that arises from different products. Our results suggest that the SP-SERS technique is ideally suited to study plasmon-driven catalytic reactions because of the possibility to monitor the reaction under controlled atmospheres in real time.
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