首页 | 本学科首页   官方微博 | 高级检索  
     检索      

铑电极在紫外区的表面增强拉曼散射机理
引用本文:杨志林,吴德印,任斌,周海光,田中群.铑电极在紫外区的表面增强拉曼散射机理[J].光谱学与光谱分析,2004,24(6):682-685.
作者姓名:杨志林  吴德印  任斌  周海光  田中群
作者单位:1. 厦门大学化学系,固体表面物理化学国家重点实验室,福建,厦门,361005;厦门大学物理系,福建,厦门,361005
2. 厦门大学化学系,固体表面物理化学国家重点实验室,福建,厦门,361005
3. 厦门大学物理系,福建,厦门,361005
基金项目:国家自然科学基金(20021002,20228020)资助
摘    要:采用波长为 32 5nm的He Cd激光为激发光源 ,首次在粗糙铑电极上获得了高质量的表面增强拉曼信号。基于在紫外区获得SERS信号这一进展 ,以电磁场理论为基础 ,分别从定性和定量的角度对此新的实验结果做了理论分析。分析表明 ,在紫外区获得的铑的SERS信号主要源自于有着特定形貌的铑纳米粒子所引起的避雷针效应及微弱的表面等离子体共振效应的共同作用。对铑纳米粒子的表面平均SERS增强因子的计算结果与实验值较为一致 ,约为两个数量级。我们同时比较分析了在可见光及近红外区有着极佳SERS增强效应的银基底在采用 32 5nm激发光时却得不到任何SERS信号这一实验结果 ,这是因为银在此紫外区间已完全不能满足表面等离子激元共振的条件所致

关 键 词:表面增强拉曼散射  紫外激发  避雷针效应  表面等离子体共振  过渡金属  
文章编号:1000-0593(2004)06-0682-04
修稿时间:2003年12月16

SERS Mechanism for Rhodium Electrode in the Ultraviolet Region
Zhi-lin Yang,De-yin Wu,Bin Ren,Hai-guang Zhou,Zhong-qun Tian.SERS Mechanism for Rhodium Electrode in the Ultraviolet Region[J].Spectroscopy and Spectral Analysis,2004,24(6):682-685.
Authors:Zhi-lin Yang  De-yin Wu  Bin Ren  Hai-guang Zhou  Zhong-qun Tian
Institution:State Key Laboratory for Physical Chemistry of Solid Surfaces, Department of Chemistry, Xiamen University, Xiamen 361005, China.
Abstract:Stable and good quality of Surface Enhanced Raman Scattering (SERS) signal from net rhodium electrode in the ultraviolet region was observed for the first time by our group recently. In this paper, both qualitative and quantitative analyses are given to interpret the new experimental results mainly based on the electromagnetic field theory. The mechanisms of SERS for rhodium electrode in the ultraviolet region are mainly attributed to the lightning rod effect together with the weak surface plasmon resonance . According to the calculation, the surface averaged enhancement factor (SEF) for rhodium electrode in the ultraviolet region is about two orders of magnitude when the surface of the substrate is roughened properly, which is in good agreement with the experimental results . The authors also give a comparative study to show why silver, which is the best SERS active substrate in the visible and near infrared region, can't give any SERS signal when the 325 nm excitation line is used.
Keywords:Surface enhanced Raman scattering  Ultra-violet laser excitation  Lightning rod effect  Surface plasmon resonance  Transition metal  Rhodium
本文献已被 CNKI 维普 万方数据 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号