Surface Plasmon Coupling of Compositionally Heterogeneous Core鈥揝atellite Nanoassemblies
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- 作者：Jun Hee Yoon ; Yong Zhou ; Martin G. Blaber ; George C. Schatz ; Sangwoon Yoon
- 刊名：The Journal of Physical Chemistry Letters
- 出版年：2013
- 出版时间：May 2, 2013
- 年：2013
- 卷：4
- 期：9
- 页码：1371-1378
- 全文大小：416K
- 年卷期：v.4,no.9(May 2, 2013)
- ISSN：1948-7185
文摘
Understanding plasmon coupling between compositionally heterogeneous nanoparticles in close proximity is intriguing and fundamentally important because of the energy mismatch between the localized surface plasmons of the associated nanoparticles and interactions beyond classical electrodynamics. In this Letter, we explore surface plasmon coupling between silver nanoparticles (AgNPs) and gold nanoparticles (AuNPs), assembled in the form of core鈥搒atellite structures. A recently developed assembly method allows us to prepare ultrapure core鈥搒atellite nanoassemblies in solution, where 50 nm AgNPs are surrounded by 13 nm AuNPs via alkanedithiol linkers. We observe changes in the plasmon coupling between the AgNP core and AuNP satellites as the core-to-satellite gap distance varies from 2.3 to 0.7 nm. Comparison with theoretical studies reveals that the traditional hybridized plasmon modes are abruptly replaced by charge-transfer plasmons at a 1 nm gap. Changes with the number of satellites are also discussed.