【中文文摘】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
【英文文摘】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 plas...国家自然科学基金 (2 0 0 2 1 0 0 2 ;;2 0 2 2 80 2 0 )资
