Layer-by-layer self-assembly for constructing a graphene/platinum nanoparticle three-dimensional hybrid nanostructure using ionic liquid as a linker.
Layer-by-layer self-assembly for constructing a graphene/platinum nanoparticle three-dimensional hybrid nanostructure using ionic liquid as a linker.
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DOI：
10.1021/la904201j
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发表时间：
2010-01
期刊：
影响因子：
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通讯作者：
Chengzhou Zhu;Shaojun Guo;Yueming Zhai;S. Dong
中科院分区：
文献类型：
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作者：
Chengzhou Zhu;Shaojun Guo;Yueming Zhai;S. Dong
在这份报告中，我们成功地构建了一个混合的三维（3D）纳米复合薄膜交替组装的石墨烯纳米片改性的离子液体（IL）和铂纳米粒子（Pt NPs）。在该策略中，通过将1-（3-氨丙基）-3-甲基咪唑溴化物共价键合到石墨烯纳米片上来合成咪唑盐基离子液体（IS-IL）官能化的石墨烯。在石墨烯纳米片表面引入IS-IL可以得到分散的带正电荷的石墨烯纳米片。此外，石墨烯的所需功能化可以形成用于构建混合3D纳米复合膜的构建块。然后，带正电荷的IS-IL官能化的石墨烯纳米片足够强以通过静电相互作用驱动具有带负电荷的柠檬酸盐稳定的Pt NP的3D纳米材料的形成。据我们所知，目前关于G-IS-IL和纳米颗粒多层膜的逐层（LBL）自组装的报道还很少。利用紫外-可见-近红外（UV-vis-NIR）吸收光谱、原子力显微镜（AFM）和循环伏安（CV）等测试手段对多层膜的均匀生长进行了表征。新制备的含有G-IS-IL和Pt NPs的3D纳米材料显示出对氧还原的高电催化活性。此外，可以通过简单地选择LBL过程中的不同循环来进一步定制膜的电催化活性。该演示提供了一种组装石墨烯/纳米颗粒多层膜的新途径，并开辟了构建更复杂的多组分纳米结构的可能性，这些纳米结构被认为可用于电化学纳米器件。
In this report, we succeed in constructing a hybrid three-dimensional (3D) nanocomposite film by alternatively assembling the graphene nanosheets modified by ionic liquid (IL) and Pt nanoparticles (Pt NPs). In this strategy, an imidazolium salt-based ionic liquid (IS-IL)-functionalized graphene was synthesized by covalently binding 1-(3-aminopropyl)-3-methylimidazolium bromide onto graphene nanosheets. The introduction of IS-IL on the surface of graphene nanosheets can obtain dispersed graphene nanosheets with positive charge. Also, the desired functionalization of graphene can form the building blocks for constructing hybrid 3D nanocomposite film. Then, the positively charged IS-IL-functionalized graphene nanosheets are strong enough to drive the formation of the 3D nanomaterials with negatively charged citrate-stabilized Pt NPs through electrostatic interaction. As far as we know, the reports on the layer-by-layer (LBL) self-assembly of G-IS-IL and nanoparticle multilayer films are few at the moment. UV-visible-near-infrared (UV-vis-NIR) absorption spectroscopy, atomic force microscopy (AFM) and cyclic voltammetry (CV) were used to characterize the uniform growth of the multilayer film. The newly prepared 3D nanomaterials containing G-IS-IL and Pt NPs show high electrocatalytic activity toward oxygen reduction. Furthermore, the electrocatalytic activity of the films could be further tailored by simply choosing different cycles in the LBL process. This demonstration offers a new route to assemble graphene/nanoparticle multilayer films and opens up the possibility of building more complex multicomponent nanostructures, which are believed to be useful for electrochemical nanodevices.