Szustakiewicz Piotr, Kołsut Natalia, Leniart Aneta, Lewandowski Wiktor
Faculty of Chemistry, University of Warsaw, 1 Pasteura st., 02-093 Warsaw, Poland.
Faculty of Physics, University of Warsaw, 5 Pasteura st., 02-093 Warsaw, Poland.
Nanomaterials (Basel). 2019 Apr 11;9(4):602. doi: 10.3390/nano9040602.
In this study, we report a universal approach allowing the non-covalent deposition of gold nanoparticles on reduced graphene oxide surface in a controlled fashion. We used a modified Hummers method to obtain graphene oxide, which then underwent surficial functionalization with carboxyl moieties coupled with simultaneous reduction. Nanoparticles were synthesized ex-situ and capped with a thiolated poly-ethylene glycol (PEG) ligand. The interactions between the surface of modified graphene oxide and nanoparticle ligands enabled the formation of stable hybrid graphene-nanoparticles materials in the aqueous phase. Using this technique, we were able to cover the surface of graphene with gold nanoparticles of different shapes (spheres, rods, triangles, stars, and bipyramids), broad range of sizes (from 5 nm to 100 nm) and controlled grafting densities. Moreover, materials obtained with this strategy exhibited long-term stability, which coupled with the versatility and facility of preparation, makes our technique appealing in the light of increasing demand for new graphene-based hybrid nanostructures.
在本研究中，我们报告了一种通用方法，该方法能够以可控方式将金纳米颗粒非共价沉积在还原氧化石墨烯表面。我们使用改进的Hummers方法获得氧化石墨烯，然后对其进行羧基部分的表面功能化并同时进行还原。纳米颗粒在非原位合成并用硫醇化聚乙二醇（PEG）配体封端。改性氧化石墨烯表面与纳米颗粒配体之间的相互作用使得能够在水相中形成稳定的石墨烯-纳米颗粒杂化材料。使用该技术，我们能够用不同形状（球形、棒形、三角形、星形和双锥体）、广泛尺寸范围（从5纳米到100纳米）以及可控接枝密度的金纳米颗粒覆盖石墨烯表面。此外，通过该策略获得的材料表现出长期稳定性，再加上制备的多功能性和简便性，鉴于对新型基于石墨烯的杂化纳米结构的需求不断增加，使得我们的技术颇具吸引力。
