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    題名: Enhanced light–matter interaction of graphene–gold nanoparticle hybrid films for high-performance SERS detection
    作者: Yuanxin Du;Yuan Zhao;Yan Qu;Chia-Hao Chen;Chieh-Ming Chen;Cheng-Hao Chuang;Yanwu Zhu
    貢獻者: 淡江大學物理學系
    日期: 2014-04-15
    上傳時間: 2015-01-28 11:04:42 (UTC+8)
    出版者: United Kingdom: R S C Publications
    摘要: By simply coating graphene films on Au nanoparticles, the optical properties of the hybrid films are investigated. It is found that the coverage of a monolayer graphene film leads to a decreased transmittance of up to 15.8% in the visible range, much higher than the 2.3% transmittance loss for intrinsic graphene. At the same time, the plasmonic resonance of the hybrid films experiences a red-shift in resonance frequency and a broadening in the transmission dip. By means of finite element simulations, these observations are attributed to strong light–matter interaction at the interface between graphene and Au nanoparticles, as indicated by the increased absorption cross section and higher electric field intensity. The electron transfer between graphene and Au nanoparticles is confirmed by high resolution X-ray photoelectron spectroscopy studies. Furthermore, the enhanced electromagnetic hot spots at the interface between graphene and Au nanoparticles make such graphene–Au nanoparticle hybrid films cost-effective and high-performance surface-enhanced Raman scattering substrates for detecting organic molecules such as rhodamine-6G, for which an enhancement factor of [similar]107 is achieved.
    關聯: Journal of Materials Chemistry C 2, p.4683-4691
    DOI: 10.1039/C4TC00353E
    顯示於類別:[物理學系暨研究所] 期刊論文

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