Warren Scott C, Messina Lauren C, Slaughter Liane S, Kamperman Marleen, Zhou Qin, Gruner Sol M, DiSalvo Francis J, Wiesner Ulrich
Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14853, USA.
Science. 2008 Jun 27;320(5884):1748-52. doi: 10.1126/science.1159950.
The synthesis of ordered mesoporous metal composites and ordered mesoporous metals is a challenge because metals have high surface energies that favor low surface areas. We present results from the self-assembly of block copolymers with ligand-stabilized platinum nanoparticles, leading to lamellar CCM-Pt-4 and inverse hexagonal (CCM-Pt-6) hybrid mesostructures with high nanoparticle loadings. Pyrolysis of the CCM-Pt-6 hybrid produces an ordered mesoporous platinum-carbon nanocomposite with open and large pores (>/=10 nanometers). Removal of the carbon leads to ordered porous platinum mesostructures. The platinum-carbon nanocomposite has very high electrical conductivity (400 siemens per centimeter) for an ordered mesoporous material fabricated from block copolymer self-assembly.
有序介孔金属复合材料和有序介孔金属的合成是一项挑战，因为金属具有较高的表面能，这有利于形成低表面积。我们展示了嵌段共聚物与配体稳定的铂纳米颗粒自组装的结果，得到了具有高纳米颗粒负载量的层状CCM-Pt-4和反相六角形（CCM-Pt-6）混合介观结构。CCM-Pt-6杂化物的热解产生了具有开放大孔（≥10纳米）的有序介孔铂-碳纳米复合材料。去除碳后得到有序多孔铂介观结构。对于由嵌段共聚物自组装制备的有序介孔材料，铂-碳纳米复合材料具有非常高的电导率（400西门子每厘米）。
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