Graphene as an Electron Shuttle for Silver Deoxidation: Removing a Key Barrier to Plasmonics and Metamaterials for SERS in the Visible (Articolo in rivista)

Type
Label
  • Graphene as an Electron Shuttle for Silver Deoxidation: Removing a Key Barrier to Plasmonics and Metamaterials for SERS in the Visible (Articolo in rivista) (literal)
Anno
  • 2013-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1002/adfm.201303135 (literal)
Alternative label
  • Maria Losurdo , Iris Bergmair , Babak Dastmalchi , Tong-Ho Kim , Maria M. Giangregroio , Wenyuan Jiao , Giuseppe V. Bianco , April S. Brown , Kurt Hingerl , and Giovanni Bruno (2013)
    Graphene as an Electron Shuttle for Silver Deoxidation: Removing a Key Barrier to Plasmonics and Metamaterials for SERS in the Visible
    in Advanced functional materials (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Maria Losurdo , Iris Bergmair , Babak Dastmalchi , Tong-Ho Kim , Maria M. Giangregroio , Wenyuan Jiao , Giuseppe V. Bianco , April S. Brown , Kurt Hingerl , and Giovanni Bruno (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 15 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • -Institute of Inorganic Methodologies and of Plasmas-CNR, Via Orabona, 4 , 70126 , Bari , Italy -PROFACTOR GmbH , Im Stadtgut A2 , 4407 , Steyr-Gleink , Austria -Center for Surface- and Nanoanalytics Johannes Kepler University Linz, Altenbergerstr. 69 , 4040 , Linz , Austria -Electrical and Computer Engineering Department, Duke University, Durham , 27709 , NC, USA (literal)
Titolo
  • Graphene as an Electron Shuttle for Silver Deoxidation: Removing a Key Barrier to Plasmonics and Metamaterials for SERS in the Visible (literal)
Abstract
  • The role of graphene in enabling deoxidation of silver nanostructures, thereby contributing to enhance plasmonic properties and to improve the temporal stability of graphene/silver hybrids for both general plasmonic and metamaterials applications, as well as for surface enhanced Raman scattering (SERS) substrates, is demonstrated. The chemical mechanism occurring at the graphene-silver oxide interface is based on the reduction of silver oxide triggered by graphene that acts as a shuttle of electrons and as a kind of catalyst in the deoxidation. A mechanism is formulated, combining elements of electron transfer, role of defects in graphene, and electrochemical potentials of graphene, silver, and oxygen. Therefore, the formulated model represents a step forward from the simple view of graphene as barrier to oxygen diffusion proposed so far in literature. Single layer graphene grown by chemical vapor deposition is transferred onto silver thin fi lms, a periodic silver fi shnet structure fabricated by nanoimprint lithography, and onto silver nanoparticle ensembles supporting a localized surface plasmon resonance in the visible range. Through the study of these nanostructured graphene/Ag hybrids, the effectiveness of graphene in preventing and reducing oxidation of silver plasmonic structures, keeping silver in a metallic state over months at air exposure, is demonstrated. The enhanced and stable plasmonic properties of the silver-fi shnet/graphene hybrids are evaluated through their SERS response for detecting benzyl mercaptane. (literal)
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