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      Nanocomposites of size-controlled gold nanoparticles and graphene oxide: formation and applications in SERS and catalysis.

      Nanoscale
      Catalysis, Gold, chemistry, Graphite, Kinetics, Metal Nanoparticles, ultrastructure, Pyrimidines, Spectrophotometry, Ultraviolet, Spectrum Analysis, Raman

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          Abstract

          In this paper, we describe the formation of Au nanoparticle-graphene oxide (Au-GO) and -reduced GO (Au-rGO) composites by noncovalent attachment of Au nanoparticles premodified with 2-mercaptopyridine to GO and rGO sheets, respectively, viaπ-π stacking and other molecular interactions. Compared with in situ reduction of HAuCl4 on the surface of graphene sheets that are widely used to prepare Au-GO composites, the approach developed by us offers well controlled size, size distribution, and morphology of the metal nanoparticles in the metal-GO nanohybrids. Moreover, we investigated surface enhanced Raman scattering (SERS) and catalysis properties of the Au-graphene composites. We have demonstrated that the Au-GO composites are superior SERS substrates to the Au NPs. Similarly, a comparative study on the catalytic activities of the Au, Au-GO, and Au-rGO composites in the reduction of o-nitroaniline to 1,2-benzenediamine by NaBH4 indicates that both Au-GO and Au-rGO composites exhibit significantly higher catalytic activities than the corresponding Au nanoparticles.

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          Author and article information

          Journal
          20936236
          10.1039/c0nr00473a

          Chemistry
          Catalysis,Gold,chemistry,Graphite,Kinetics,Metal Nanoparticles,ultrastructure,Pyrimidines,Spectrophotometry, Ultraviolet,Spectrum Analysis, Raman

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