Direct visual evidence for chemical mechanisms of SERRS via charge transfer in Au-20-pyrazine-Au-20 junction

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	Direct visual evidence for chemical mechanisms of SERRS via charge transfer in Au-20-pyrazine-Au-20 junction
	Sun, MT ; Li, ZP ; Liu, YJ ; Xu, HX
刊名	JOURNAL OF RAMAN SPECTROSCOPY
	2009
卷号	40 期号:12 页码:1942
关键词	ENHANCED RAMAN-SCATTERING SILVER ELECTRODE SPECTROSCOPY PYRIDINE SPECTRA COMPLEX SYSTEM
ISSN号	0377-0486
通讯作者	Sun, MT: Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, POB 603-146, Beijing 100190, Peoples R China.
中文摘要	The essence of the chemical mechanism for surface-enhanced resonance Raman scattering (SERRS) is the charge transfer (CT) between the metal and the molecule at the resonant electronic transition, which results in the mode-selective enhancement in the SERRS spectrum. The site-orientated CT can directly interpret the mode-selective chemical enhancement in SERRS. However, it is a great challenge to intutively visualize the orientation and site of the CT. In this paper, for the pyrazine-Au-2 complex, a three-dimensional (3D) cubic representation is built to provide direct visual evidence for chemical mechanisms of SERRS via CT from the Au-2 cluster to pyrazine at the resonant electronic transition. The relationship between the mode-selective enhancements in SERRS and the site-orientated CT was clearly revealed. The intracluster excitation (analog of plasmon excitation in large naonoparticles) was also visualized by the 3D cubic presentation, which provided the direct evidence of local electromagnetic field enhancement of SERRS. To study the quantum size effect and the coupling effect of the nanoparticles, the photoexcitation mechanisms of the Au-20 - pyrazine complex and the Au-20 - pyrazine - Au-20 junction were also investigated. The tunneling charge transfer from one Au-20 cluster to another Au-20 cluster outside the pyrazine in Au-20 - pyrazine - Au-20 junction was also revealed visually. The calculated normalized extinction spectra of Au nanoparticles using the generalized Mie theory reveal that the resonance peak is red-shifted due to the coupling between particles. Copyright (C) 2009 John Wiley & Sons, Ltd.
收录类别	SCI
资助信息	National Natural Science Foundation of China [20703064, 20673012, 108074234]; National Basic Research Program of China [2009CB930701, 2007CB936804]; Sino-Swedish collaborations on nanophotonics and nanoelectronics [2006DFB02020]; CAS
语种	英语
公开日期	2013-09-17
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/36081]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Sun, MT,Li, ZP,Liu, YJ,et al. Direct visual evidence for chemical mechanisms of SERRS via charge transfer in Au-20-pyrazine-Au-20 junction[J]. JOURNAL OF RAMAN SPECTROSCOPY,2009,40(12):1942.
APA	Sun, MT,Li, ZP,Liu, YJ,&Xu, HX.(2009).Direct visual evidence for chemical mechanisms of SERRS via charge transfer in Au-20-pyrazine-Au-20 junction.JOURNAL OF RAMAN SPECTROSCOPY,40(12),1942.
MLA	Sun, MT,et al."Direct visual evidence for chemical mechanisms of SERRS via charge transfer in Au-20-pyrazine-Au-20 junction".JOURNAL OF RAMAN SPECTROSCOPY 40.12(2009):1942.