A Generic Synthetic Approach to Large‐Scale Pristine‐Graphene/Metal‐Nanoparticles Hybrids
A Generic Synthetic Approach to Large‐Scale Pristine‐Graphene/Metal‐Nanoparticles Hybrids
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DOI：
10.1002/adfm.201301409
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发表时间：
2013-12
影响因子：
19
通讯作者：
Xiujuan Wang;G. Meng;Chuhong Zhu;Zhulin Huang;Yiwu Qian;Kexi Sun;Xiaoguang Zhu
中科院分区：
文献类型：
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作者：
Xiujuan Wang;G. Meng;Chuhong Zhu;Zhulin Huang;Yiwu Qian;Kexi Sun;Xiaoguang Zhu
金属纳米颗粒（金属纳米颗粒）在原始石墨烯表面上的均匀附着以构建原始石墨烯/金属纳米颗粒杂化物被高度期望用于许多领域，例如透明电极和导电复合材料。然而，这仍然是一个巨大的挑战，因为原始石墨烯是高度疏水的。在这里，提出了一种大规模原始石墨烯/金属-NP杂化物的环境友好的通用合成方法，其通过以下组合过程：通过超声处理和离心在N-甲基吡咯烷酮中剥离膨胀石墨以获得原始石墨烯，并通过金属-NP和原始石墨烯之间的货车德瓦尔斯相互作用将预合成的金属-NP附着在乙醇中的原始石墨烯上。具有各种形态（例如球形、立方体、板状、多角度和球形颗粒组装）的不同金属（例如Ag、Au和Pd）的纳米颗粒可以以受控的堆积密度均匀地附着在无缺陷的原始石墨烯上。原始石墨烯和金属纳米颗粒都保留了它们原始的固有结构。由于原始石墨烯的大表面积吸附更多目标分子和Ag-NP的电磁增强的组合效应，合成的原始石墨烯/Ag-NP杂化物显示出非常高的表面增强拉曼散射活性。这种具有可调形状和金属纳米颗粒堆积密度的原始石墨烯/金属纳米颗粒混合物的大规模合成为基础研究和从设备到透明电极和导电复合材料的潜在应用开辟了机会。
The homogeneous attachment of metal‐nanoparticles (metal‐NPs) on pristine‐graphene surface to construct pristine‐graphene/metal‐NPs hybrids is highly expected for application in many fields such as transparent electrodes and conductive composites. However, it remains a great challenge since the pristine‐graphene is highly hydrophobic. Here, an environmentally friendly generic synthetic approach to large‐scale pristine‐graphene/metal‐NPs hybrids is presented, by a combinatorial process of exfoliating expanded graphite in N‐methyl pyrrolidone via sonication and centrifugation to achieve the pristine‐graphene, and attaching pre‐synthesized metal‐NPs on the pristine‐graphene in ethanol via van der Waals interactions between the metal‐NPs and the pristine‐graphene. Nanoparticles of different metals (such as Ag, Au, and Pd) with various morphologies (such as sphere, cube, plate, multi‐angle, and spherical‐particle assembling) can be homogeneously attached on the defect‐free pristine‐graphene with controlled packing densities. Both the pristine‐graphene and the metal‐NPs preserve their original intrinsic structures. The as‐synthesized pristine‐graphene/Ag‐NPs hybrids show very high surface‐enhanced Raman scattering activity due to the combined effects of large surface area of the pristine‐graphene to adsorb more target molecules and the electromagnetic enhancement of the Ag‐NPs. This large‐scale synthesis of the pristine‐graphene/metal‐NPs hybrids with tunable shape and packing density of metal‐NPs opens up opportunities for fundamental research and potential applications ranging from devices to transparent electrodes and conductive composites.