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

机译：石墨烯作为银脱氧的电子穿梭：消除可见光中SERS的等离子和超材料的主要障碍

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摘要

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 films, a periodic silver fishnet 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-fishnet/graphene hybrids are evaluated through their SERS response for detecting benzyl mercaptane.
机译：石墨烯在使银纳米结构脱氧，从而增强等离激元性质以及改善石墨烯/银杂化体在一般等离激元和超材料应用以及表面增强拉曼散射（SERS）衬底中的作用方面的作用是演示。发生在石墨烯-氧化银界面的化学机理是基于氧化石墨烯触发的氧化银的还原，所述石墨烯充当电子的穿梭和脱氧中的一种催化剂。结合电子转移元素，石墨烯中缺陷的作用以及石墨烯，银和氧的电化学势，制定了一种机理。因此，从目前为止在文献中提出的石墨烯作为阻碍氧扩散的简单观点来看，建立的模型代表了向前的一步。通过化学气相沉积法生长的单层石墨烯被转移到银薄膜上，通过纳米压印光刻技术制成周期性的银鱼网结构，并转移到支持在可见光范围内的局部表面等离子体共振的银纳米颗粒集合体上。通过对这些纳米结构的石墨烯/银杂化物的研究，证明了石墨烯在防止和减少银等离激元结构的氧化，在暴露于空气中数月内保持金属状态的有效性。通过银-渔网/石墨烯杂化体的SERS响应来评估苄基硫醇，可以评估其增强和稳定的等离子体性能。

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  • 来源
    《Advanced Functional Materials》 |2014年第13期|1864-1878|共15页
  • 作者

    Maria Losurdo; Iris Bergmair; Babak Dastmalchi; Tong-Ho Kim; Maria M. Giangregroio; Wenyuan jiao; Giuseppe V. Bianco; April S. Brown; Kurt Hingerl; Giovanni Bruno;

  • 作者单位

    Institute of Inorganic Methodologies and of Plasmas-CNR Via Orabona, 4, 70126, Bari, Italy;

    Functional Surfaces and Nanostructures PROFACTOR GmbH, lm 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;

    Institute of Inorganic Methodologies and of Plasmas-CNR Via Orabona, 4, 70126, Bari, Italy;

    Electrical and Computer Engineering Department Duke University Durham, 27709, NC, USA;

    Institute of Inorganic Methodologies and of Plasmas-CNR Via Orabona, 4, 70126, Bari, Italy;

    Electrical and Computer Engineering Department Duke University Durham, 27709, NC, USA;

    Center for Surface- and Nanoanalytics Johannes Kepler University Linz Altenbergerstr. 69, 4040, Linz, Austria;

    Institute of Inorganic Methodologies and of Plasmas-CNR Via Orabona, 4, 70126, Bari, Italy;

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