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Indexed by:期刊论文

Date of Publication:2017-04-01

Journal:JOURNAL OF RAMAN SPECTROSCOPY

Included Journals:SCIE

Volume:48

Issue:4

Page Number:560-569

ISSN No.:0377-0486

Key Words:coupling effect; charge transfer; SERRS; DFT; Ac@Au-7 cluster

Abstract:In this work, charge-transfer mechanism of surface-enhanced resonance Raman scattering (SERRS) spectroscopy of pyrazine absorbed on Ac@Au-7 clusters is theoretically investigated, and the coupling effect between the nanoparticles is especially concerned. First, the contributions of coupling effect to surface-enhanced Raman scattering (SERS) are compared between the ground-state nanoparticles. Second, the visualization of charge transfer provides evidence for the coupling effect on the charge-transfer enhancement mechanism of SERRS spectroscopy. The theoretical results show that the coupling effect on charge-transfer mechanism of SERRS can significantly enhance the intensity of SERS spectra up to about 6 x 10(5) times. The different coupling ways not only result in different degree of charge transfer on electronic transitions, but also cause different intensity of charge-transfer absorption peaks. Both of them strongly influence the enhancement of charge-transfer mechanism of SERRS. This study promotes the understanding of charge-transfer enhancement mechanism of SERRS for ultrasensitive Raman spectral analysis at nanoscale. Copyright (c) 2017 John Wiley & Sons, Ltd.