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Browsing by Author "Lin, Hsing-Ying"

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    Surface-enhanced Raman scattering of graphene with photo-assisted-synthesized gold nanoparticles
    (2013-03-11)
    Cheng, Cheng-En
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    Lin, Chi-Yuan
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    Chang, Hao-Yu
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    Huang, Chen-Han
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    Lin, Hsing-Ying
    This paper presents a convenient and reliable method to prepare gold nanoparticles (AuNPs) on graphene. Photo-assisted synthesis (PAS) was employed to grow AuNPs in AuCl4- electrolyte on graphene. The size of AuNPs could be as large as 130 nm. This optical method had a steady growth rate of AuNPs. The distribution of AuNPs was well controlled by focusing the laser for PAS. The minimum diameter of the distribution was approximately 1 mu m. Surface-enhanced Raman scattering of graphene due to AuNPs was observed. Electrical fields near AuNPs calculated by the finite-difference time-domain algorithm ensured that the Raman enhancement was attributed to the localized surface plasmons of AuNPs. (c) 2013 Optical Society of America