Surface plasmon coupling of compositionally heterogeneous core-satellite nanoassemblies

Jun Hee Yoon, Yong Zhou, Martin G. Blaber, George C. Schatz*, Sangwoon Yoon

*Corresponding author for this work

Research output: Contribution to journalArticle

47 Scopus citations

Abstract

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-satellite structures. A recently developed assembly method allows us to prepare ultrapure core-satellite 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.

Original languageEnglish (US)
Pages (from-to)1371-1378
Number of pages8
JournalJournal of Physical Chemistry Letters
Volume4
Issue number9
DOIs
StatePublished - May 2 2013

Keywords

  • charge transfer plasmon
  • core-satellite nanoassembly
  • generalized multiparticle Mie theory
  • heterogeneous nanoassembly
  • hybridization of surface plasmon mode
  • surface plasmon coupling

ASJC Scopus subject areas

  • Materials Science(all)
  • Physical and Theoretical Chemistry

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