Evidence of plasmonic coupling in gallium nanoparticles/graphene/SiC.

Published

Journal Article

Graphene is emerging as a promising material for plasmonics applications due to its strong light-matter interactions, most of which are theoretically predicted but not yet experimentally realized. Therefore, the integration of plasmonic nanoparticles to create metal nanoparticle/graphene composites enables numerous phenomena important for a range of applications from photonics to catalysis. For these applications it is important to articulate the coupling of photon-based excitations such as the interaction between plasmons in each of the material components, as well as their charge-based interactions dependent upon the energy alignment at the metal/graphene interface. These coupled phenomena underpin an active application area in graphene-based composites due to nanoparticle-dependent surface-enhanced Raman scattering (SERS) of graphene phonon modes. This study reveals the coupling of a graphene/SiC support with Ga-nanoparticle-localized surface plasmon resonance, which is of particular interest due to its ability to be tuned across the UV into the near-IR region. This work is the first demonstration of the evolving plasmon resonance on graphene during the synthesis of surface-supported metal nanoparticles, thus providing evidence for the theoretically predicted screening revealed by a damped resonance with little energy shift. Therefore, the role of the graphene/substrate heterojunction in tailoring the plasmon resonance for nanoplasmonic applications is shown. Additionally, the coupled phenomena between the graphene-Ga plasmon properties, charge transfer, and SERS of graphene vibrational modes are explored.

Full Text

Duke Authors

Cited Authors

  • Yi, C; Kim, T-H; Jiao, W; Yang, Y; Lazarides, A; Hingerl, K; Bruno, G; Brown, A; Losurdo, M

Published Date

  • September 2012

Published In

Volume / Issue

  • 8 / 17

Start / End Page

  • 2721 - 2730

PubMed ID

  • 22674808

Pubmed Central ID

  • 22674808

Electronic International Standard Serial Number (EISSN)

  • 1613-6829

International Standard Serial Number (ISSN)

  • 1613-6810

Digital Object Identifier (DOI)

  • 10.1002/smll.201200694

Language

  • eng