All-Metal Mesoporous Nanocolloids: Solution-Phase Synthesis of Core-Shell Pd@Pt Nanoparticles with a Designed Concave Surface
All-Metal Mesoporous Nanocolloids: Solution-Phase Synthesis of Core-Shell Pd@Pt Nanoparticles with a Designed Concave Surface
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DOI：
10.1002/anie.201307126
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发表时间：
2013-12-16
影响因子：
16.6
通讯作者：
Yamauchi, Yusuke
中科院分区：
文献类型：
--
作者：
Ataee-Esfahani, Hamed;Imura, Masataka;Yamauchi, Yusuke
近年来，人们一直致力于合成形状和尺寸可控的具有新颖物理和化学性质的金属胶体纳米粒子。[1]先前的合成方法已经采用了预成形的金属种子和/或各种化学添加剂。在几乎所有这些情况下，需要复杂的程序，包括几个步骤和/或高压和高温条件。[2]由于第二金属的协同作用，双金属纳米颗粒通常表现出比单金属纳米颗粒更优越的上级催化活性。[3]然而，非均相纳米颗粒，如核-壳结构，比单分散纳米颗粒更难制备。这是由于金属盐还原速率的差异和结构导向剂与金属表面相互作用的不同倾向所导致的复杂合成条件。迄今为止，很少有方法被开发用于在受控条件下在金属纳米颗粒上形成浅凹[4]，但是具有介孔的金属纳米颗粒的简易合成，其提供高的表面积与体积比，仍然是一个具有挑战性的问题。我们的目标是合成具有高折射率晶面的介孔金属纳米粒子，它可以为催化反应，特别是电氧化反应提供许多催化活性位点，由于其不同的工业和技术应用，近年来介孔二氧化硅纳米粒子的合成受到了广泛的关注。这些介孔纳米颗粒的性质可以很大程度上受颗粒尺寸的影响。将颗粒尺寸减小到纳米范围（小于100 nm）使得能够制备具有令人感兴趣的性质的持续胶体悬浮液。介孔纳米粒子在吸附、催化、药物输送和能量储存等重要应用中非常有用。[5]然而，以前报道的介孔纳米颗粒的组成仅限于金属氧化物（如二氧化硅或二氧化钛）[6]和碳[7]，这严重降低了介孔纳米颗粒的可能应用范围。
In recent years, much effort has been made towards the synthesis of shape-and size-controlled metal colloidal nanoparticles that possess novel physical and chemical properties.[1] Previous synthetic methods have employed preformed metal seeds and/or various chemical additives. In almost all of these cases, complicated procedures, including several steps and/or high pressure and temperature conditions, are required.[2] Bimetallic nanoparticles have often shown superior catalytic activity over their monometallic counterparts, owing to the synergetic effect of the second metal.[3] However, heterogeneous bimetallic nanoparticles, such as core–shell structures, are more difficult to prepare than monometallic nanoparticles. This is due to the complicated synthetic conditions caused by the difference in the reduction rate of metal salts and the different tendencies of structural directing agents for interaction with metal surfaces. To date, few methods have been developed for the formation of shallow concavities on metal nanoparticles under controlled conditions,[4] but the facile synthesis of metal nanoparticles with mesopores, which provide a high surface-to-volume ratio, is still a challenging issue. Our target in this study is the synthesis of mesoporous metal nanoparticles with high indexed facets, which can provide many catalytically active sites for catalytic reactions, especially in electrooxidation reactions.Much attention has recently been paid to the synthesis of mesoporous silica nanoparticles because of their different industrial and technological applications. The properties of these mesoporous nanoparticles can be greatly affected by particle sizes. Reducing the particle sizes to the nanometer range (less than 100 nm) enables sustained colloidal suspensions with interesting properties to be made. Mesoporous nanoparticles are highly useful in important applications, such as adsorption, catalysis, drug delivery and energy storage.[5] However, the compositions of mesoporous nanoparticles previously reported have been limited to metal oxides (such as silica or titania)[6] and carbon,[7] which seriously devalues the possible application range of mesoporous nanoparticles.