Abstract

The role of graphene in enabling deoxidation of silver nanostructures, therebycontributing to enhance plasmonic properties and to improve the temporalstability of graphene/silver hybrids for both general plasmonic and metamaterialsapplications, as well as for surface enhanced Raman scattering(SERS) substrates, is demonstrated. The chemical mechanism occurring atthe graphene-silver oxide interface is based on the reduction of silver oxidetriggered by graphene that acts as a shuttle of electrons and as a kind of catalystin the deoxidation. A mechanism is formulated, combining elements ofelectron transfer, role of defects in graphene, and electrochemical potentialsof graphene, silver, and oxygen. Therefore, the formulated model representsa step forward from the simple view of graphene as barrier to oxygen diffusionproposed so far in literature. Single layer graphene grown by chemicalvapor deposition is transferred onto silver thin fi lms, a periodic silver fi shnetstructure fabricated by nanoimprint lithography, and onto silver nanoparticleensembles supporting a localized surface plasmon resonance in the visiblerange. Through the study of these nanostructured graphene/Ag hybrids, theeffectiveness of graphene in preventing and reducing oxidation of silver plasmonicstructures, keeping silver in a metallic state over months at air exposure,is demonstrated. The enhanced and stable plasmonic properties of thesilver-fi shnet/graphene hybrids are evaluated through their SERS responsefor detecting benzyl mercaptane.

Autore Pugliese

• Bianco Giuseppe Valerio , Losurdo Maria , Giangregorio Maria Michela

Tutti gli autori

• M. Losurdo ; I. Bergmair ; B. Dastmalchi ; T.-H. Kim ;M.M. Giangregroio ; W. Jiao ; G.V. Bianco ; A.S. Brown ;K. Hingerl ; G. Bruno

Titolo volume/Rivista

Advanced functional materials

Anno di pubblicazione

2013

ISSN

1616-301X

ISBN

Non Disponibile

Numero di citazioni Wos

Nessuna citazione

Ultimo Aggiornamento Citazioni

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Numero di citazioni Scopus

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Ultimo Aggiornamento Citazioni

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Settori ERC

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Codici ASJC

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