Characteristic Length and Temperature Dependence of Surface Enhanced Raman Scattering of Nanoporous Gold
Characteristic Length and Temperature Dependence of Surface Enhanced Raman Scattering of Nanoporous Gold
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DOI：
10.1021/jp903137n
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发表时间：
2009-06-25
影响因子：
3.7
通讯作者：
Chen, M. W.
中科院分区：
文献类型：
--
作者：
Lang, X. Y.;Guan, P. F.;Chen, M. W.
以罗丹明6G为探针分子，研究了不同孔径纳米孔金（NPG）在80 ~ 300 K温度下的表面增强拉曼散射（SERS）。结果表明，随着温度和纳米孔尺寸的减小，SERS强度显著增加。理论分析表明，SERS增强是电子-声子散射、有限韧带尺寸效应和相邻金韧带之间的电磁耦合共同作用的结果，证明了NPG SERS效应的电磁来源。
Surface enhanced Raman scattering (SERS) of nanoporous gold (NPG) with various nanopore sizes was investigated at temperatures ranging from 80 to 300 K using rhodamine 6G as probe molecules. It was found that the SERS intensity dramatically increases as temperature and nanopore size decrease. Theoretical analysis indicates that the improved SERS enhancements result from the confluence effects of the electron-phonon scattering, the finite ligament size effect, and the electromagnetic coupling between neighboring gold ligaments, which demonstrate the electromagnetic origin of the SERS effect of NPG.