Mesoporous Colloidal Superparticles of Platinum‐Group Nanocrystals with Surfactant‐Free Surfaces and Enhanced Heterogeneous Catalysis
Mesoporous Colloidal Superparticles of Platinum‐Group Nanocrystals with Surfactant‐Free Surfaces and Enhanced Heterogeneous Catalysis
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DOI：
10.1002/adfm.201403664
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发表时间：
2015-03
影响因子：
19
通讯作者：
Yongxing Hu;Yuzi Liu;Yugang Sun
中科院分区：
文献类型：
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作者：
Yongxing Hu;Yuzi Liu;Yugang Sun
纳米晶体的胶体超微粒（Colloidal Superparticles，CSP）是一类以胶体颗粒形式组装的纳米晶体，由于其具有潜在的新颖性质，已成为纳米技术领域的一个新的前沿。在这里，报道了一种简便的方法用于控制合成由各种铂族纳米晶体制成的介孔CSP，这些纳米晶体表现出高胶体稳定性和无配体表面，以显着地有益于它们在溶液相多相催化中的应用。该合成依赖于复合颗粒的自限制性生长，该自限制性生长是通过Pt-基纳米晶体（或其前体化合物）和银卤化物在胶体银颗粒的牺牲基底上的共沉淀实现的。复合颗粒中的中间体卤化银在限制单个Pt-基团纳米晶体的连续生长（和/或聚结）中起关键作用，并且它们可以选择性地溶解以在所得CSP中产生纳米级孔。
Synthesis of colloidal superparticles (CSPs) of nanocrystals, a class of assembled nanocrystals in the form of colloidal particles, has been emerging as a new frontier in the field of nanotechnology because of their potential novel properties originated from coupling of individual nanocrystals in CSPs. Here, a facile approach is reported for the controlled synthesis of mesoporous CSPs made of various platinum‐group nanocrystals that exhibit high colloidal stability and ligand‐free surfaces to significantly benefit their applications in solution‐phase heterogeneous catalysis. The synthesis relies on self‐limiting growth of composite particles through coprecipitation of both Pt‐group nanocrystals (or their precursor compounds) and silver halides on sacrificial substrates of colloidal silver particles. The intermediate silver halides in the composite particles play the critical role in limiting the continuous growth (and/or coalescence) of individual Pt‐group nanocrystals and they can be selectively dissolved to create nanoscale pores in the resulting CSPs.