Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences, Suzhou, 215125, PR China.
Nanoscale. 2010 Dec;2(12):2733-8. doi: 10.1039/c0nr00473a. Epub 2010 Oct 11.
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.
在本文中，我们描述了通过π-π 堆积和其他分子相互作用，分别将预先用 2-巯基吡啶修饰的 Au 纳米粒子非共价附着到 GO 和 rGO 片上，形成 Au 纳米粒子-氧化石墨烯（Au-GO）和 -还原氧化石墨烯（Au-rGO）复合材料。与广泛用于制备 Au-GO 复合材料的在石墨烯片表面原位还原 HAuCl4 的方法相比，我们开发的方法可在金属-GO 纳米杂化物中对金属纳米粒子的尺寸、尺寸分布和形态进行良好控制。此外，我们研究了 Au-石墨烯复合材料的表面增强拉曼散射（SERS）和催化性能。我们已经证明，与 Au NPs 相比，Au-GO 复合材料是更优的 SERS 基底。同样，通过 NaBH4 将邻硝基苯胺还原为 1,2-苯二胺，对 Au、Au-GO 和 Au-rGO 复合材料的催化活性进行比较研究表明，Au-GO 和 Au-rGO 复合材料的催化活性均明显高于相应的 Au 纳米粒子。
