Direct visual evidence for the chemical mechanism of surface-enhanced resonance Raman scattering via charge transfer: (II) Binding-site and quantum-size effects
(2009) In Journal of Raman Spectroscopy 40(9). p.1172-1177- Abstract
- We describe quantum-size and binding-site effects on the chemical and local field enhancement mechanisms of surface-enhanced resonance Raman scattering (SERRS), in which the pyridine molecule is adsorbed on one of the vertices of the Ag-20 tetrahedron. We first investigated the influence of the binding site on normal Raman scattering (NRS) and excited state properties of optical absorption spectroscopy. Second, we investigated the quantum-size effect on the electromagnetic (EM) and chemical mechanism from 300 to 1000 nm with charge difference density. It is found that the strong absorption at around 350 nm is mainly the charge transfer (CT) excitation (CT between the molecule and the silver cluster) for large clusters, which is the direct... (More)
- We describe quantum-size and binding-site effects on the chemical and local field enhancement mechanisms of surface-enhanced resonance Raman scattering (SERRS), in which the pyridine molecule is adsorbed on one of the vertices of the Ag-20 tetrahedron. We first investigated the influence of the binding site on normal Raman scattering (NRS) and excited state properties of optical absorption spectroscopy. Second, we investigated the quantum-size effect on the electromagnetic (EM) and chemical mechanism from 300 to 1000 nm with charge difference density. It is found that the strong absorption at around 350 nm is mainly the charge transfer (CT) excitation (CT between the molecule and the silver cluster) for large clusters, which is the direct evidence for the chemical enhancement mechanism for SERRS; for a small cluster the strong absorption around 350 nm is mainly intracluster excitation, which is the direct evidence for the EM enhancement mechanism. This conclusion is further confirmed with the general Mie theory. The plasmon peak in EM enhancement will be red-shifted with the increase of cluster size. The influence of the binding site and quantum-size effects on NRS, as well as chemical and EM enhancement mechanisms on SERRS, is significant. Copyright (C) 2009 John Wiley & Sons, Ltd. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1507281
- author
- Sun, Mengtao ; Liu, Shasha ; Li, Zhipeng ; Duan, Jianmin ; Chen, Maodu and Xu, Hongxing LU
- organization
- publishing date
- 2009
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- SERRS, chemical enhancement, charge transfer, binding site, quantum size
- in
- Journal of Raman Spectroscopy
- volume
- 40
- issue
- 9
- pages
- 1172 - 1177
- publisher
- John Wiley & Sons Inc.
- external identifiers
-
- wos:000270692700013
- scopus:70349820779
- ISSN
- 1097-4555
- DOI
- 10.1002/jrs.2255
- language
- English
- LU publication?
- yes
- id
- c703d4fd-1e6e-4dd0-84a9-c70748b8ecd4 (old id 1507281)
- date added to LUP
- 2016-04-01 14:17:10
- date last changed
- 2022-01-27 23:45:35
@article{c703d4fd-1e6e-4dd0-84a9-c70748b8ecd4,
abstract = {{We describe quantum-size and binding-site effects on the chemical and local field enhancement mechanisms of surface-enhanced resonance Raman scattering (SERRS), in which the pyridine molecule is adsorbed on one of the vertices of the Ag-20 tetrahedron. We first investigated the influence of the binding site on normal Raman scattering (NRS) and excited state properties of optical absorption spectroscopy. Second, we investigated the quantum-size effect on the electromagnetic (EM) and chemical mechanism from 300 to 1000 nm with charge difference density. It is found that the strong absorption at around 350 nm is mainly the charge transfer (CT) excitation (CT between the molecule and the silver cluster) for large clusters, which is the direct evidence for the chemical enhancement mechanism for SERRS; for a small cluster the strong absorption around 350 nm is mainly intracluster excitation, which is the direct evidence for the EM enhancement mechanism. This conclusion is further confirmed with the general Mie theory. The plasmon peak in EM enhancement will be red-shifted with the increase of cluster size. The influence of the binding site and quantum-size effects on NRS, as well as chemical and EM enhancement mechanisms on SERRS, is significant. Copyright (C) 2009 John Wiley & Sons, Ltd.}},
author = {{Sun, Mengtao and Liu, Shasha and Li, Zhipeng and Duan, Jianmin and Chen, Maodu and Xu, Hongxing}},
issn = {{1097-4555}},
keywords = {{SERRS; chemical enhancement; charge transfer; binding site; quantum size}},
language = {{eng}},
number = {{9}},
pages = {{1172--1177}},
publisher = {{John Wiley & Sons Inc.}},
series = {{Journal of Raman Spectroscopy}},
title = {{Direct visual evidence for the chemical mechanism of surface-enhanced resonance Raman scattering via charge transfer: (II) Binding-site and quantum-size effects}},
url = {{http://dx.doi.org/10.1002/jrs.2255}},
doi = {{10.1002/jrs.2255}},
volume = {{40}},
year = {{2009}},
}