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Surface-Enhanced Raman Scattering from Individual Au Nanoparticles on Au Films |
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| Authors: | ChaoLing Du ChaoJun Du YuMeng You CongJun He Jian Luo DaNing Shi |
| Affiliation: | 1. College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing, 211100, People’s Republic of China 2. School of Chemical Engineering and Environment, Beijing Institute of Technology, Beijing, 100081, China 3. Department of Chemistry, Yale University, 225 Prospect Street, New Haven, CT, 06520, USA |
| Abstract: | We investigated the effect of optical thick metal films on the surface-enhanced Raman scattering (SERS) activity of individual Au nanoparticle (NP) monomers and dimers. The film presence is revealed to be positive for the SERS activity of individual NP monomers, while it is not always positive for the electromagnetic enhancement at hot spots for SERS of the dimer, which is explained well by our numerical simulations. The polarized SERS signals from the NP dimer are elucidated well in terms of the plasmon hybridization of the dimer. SERS contributions both from individual NP surfaces and the junction between the NP and its supporting substrate were discussed as well. |
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