Template-Directed Assembly of Metal-Chalcogenide Nanocrystals into Ordered Mesoporous Networks
Template-Directed Assembly of Metal-Chalcogenide Nanocrystals into Ordered Mesoporous Networks
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DOI：
10.1021/acsnano.5b01014
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发表时间：
2015-04-01
期刊：
影响因子：
17.1
通讯作者：
Armatas, Gerasimos S.
中科院分区：
文献类型：
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作者：
Vamvasakis, Ioannis;Subrahmanyam, Kota S.;Armatas, Gerasimos S.
尽管具有高度可及孔表面和有序介孔的金属和金属氧化物纳米多孔网络的合成已经取得了很大的进展，但金属硫化物纳米晶的组装三维介观结构的合成仍然是具有挑战性的。在这项工作中，我们证明了有序的介孔网络，其中包括定义良好的互联金属硫化物纳米晶，可以通过聚合物模板氧化聚合过程来制备。聚合物模板的溶剂抽提后得到的自组装介孔结构赋予了发光金属硫化物纳米晶、三维开孔结构、高比表面积和均匀孔的独特组合。我们发现，这些材料的孔表面是活性的，可以被引入的分子访问，表现出很高的光催化活性和稳定性，例如，在1-苯乙醇氧化制苯乙酮方面。通过选择合适的合成组分，我们证明了这种方法对于从不同尺寸和组成的金属硫化物纳米晶制备有序介孔材料是通用的。
Although great progress in the synthesis of porous networks of metal and metal oxide nanoparticles with highly accessible pore surface and ordered mesoscale pores has been achieved, synthesis of assembled 3D mesostructures of metal-chalcogenide nanocrystals is still challenging. In this work we demonstrate that ordered mesoporous networks, which comprise well-defined interconnected metal sulfide nanocrystals, can be prepared through a polymer-templated oxidative polymerization process. The resulting self-assembled mesostructures that were obtained after solvent extraction of the polymer template impart the unique combination of light-emitting metal chalcogenide nanocrystals, three-dimensional open-pore structure, high surface area, and uniform pores. We show that the pore surface of these materials is active and accessible to incoming molecules, exhibiting high photocatalytic activity and stability, for instance, in oxidation of 1-phenylethanol into acetophenone. We demonstrate through appropriate selection of the synthetic components that this method is general to prepare ordered mesoporous materials from metal chalcogenide nanocrystals with various sizes and compositions.