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Synthesis of rGO–Ag nanoparticles for high-performance SERS and the adsorption geometry of 2-mercaptobenzimidazole on Ag surface

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Abstract

The sliver nanoparticles (AgNPs) with diameters of 30∼50 nm were self-assembled onto the surfaces of reduced graphene oxide (rGO) sheets simply by mixing AgNO3 aqueous solution and GO dispersion via a synchronous reduction process. Structure and morphology of the rGO–AgNPs hybrids were well characterized. More significantly, the surface-enhanced Raman scattering (SERS) spectrum of 2-mercaptobenzimidazole (MBI) adsorbed on the solid rGO–AgNPs surface shown that the rGO–AgNPs system gives a very strong SERS intensity at in-plane vibrational modes in comparison to the out-of-plane vibrational modes. This large enhancement effect is most likely a result of charge-transfer (CT) mechanism. Based on the surface selection rules and the information provided by the highly enhanced in-plane vibrational modes, it can be found that MBI molecule was adsorbed on AgNPs surface as a thiol form via the sulphur and nitrogen atoms with a slightly tilted geometric conformation.

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Acknowledgements

We acknowledge the financial support from Graduate Innovation Fund of Shanghai University (No. SHUCX120051).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Shanghai University, Shanghai, 200072, China

    H. L. Zheng, S. S. Yang, J. Zhao & Z. C. Zhang

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  1. H. L. Zheng
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  2. S. S. Yang
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  3. J. Zhao
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  4. Z. C. Zhang
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Correspondence to Z. C. Zhang.

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Zheng, H.L., Yang, S.S., Zhao, J. et al. Synthesis of rGO–Ag nanoparticles for high-performance SERS and the adsorption geometry of 2-mercaptobenzimidazole on Ag surface. Appl. Phys. A 114, 801–808 (2014). https://doi.org/10.1007/s00339-013-7659-6

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  • DOI: https://doi.org/10.1007/s00339-013-7659-6

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