Lateral Etching of Core-Shell Au@Metal Nanorods to Metal-Tipped Au Nanorods with Improved Catalytic Activity
Lateral Etching of Core-Shell Au@Metal Nanorods to Metal-Tipped Au Nanorods with Improved Catalytic Activity
复制标题
核壳金@金属纳米棒横向蚀刻为具有改进催化活性的金属尖端金纳米棒
DOI：
10.1021/nn203793k
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发表时间：
2012-02-01
期刊：
影响因子：
17.1
通讯作者：
Yang, Jian
中科院分区：
文献类型：
--
作者：
Guo, Xia;Zhang, Qiao;Yang, Jian
杂化材料的选择性生长/刻蚀对于合理合成分级结构和精确调节其物理性能是非常重要的。在这里，核-壳Au@Ag纳米棒的横向蚀刻通过FeCl 3在室温下实现，产生许多哑铃状Ag尖端Au纳米棒。这种在核-壳纳米棒侧面的选择性蚀刻归因于侧面的反应性增加，这是由于十六烷基三甲基溴化铵的表面钝化较少。类似的合成策略也已被证明是成功的Pd-tipped Au纳米棒，没有以前的报道，表明这种选择性蚀刻的巨大潜力。研究了Ag修饰的Au纳米棒在室温下对对硝基苯酚的催化还原反应。Ag修饰的Au纳米棒比Au纳米棒和核壳结构的Au@Ag纳米棒具有更高的催化活性，这可能是由于Ag修饰的Au纳米棒中的电子效应和独特的结构所致。
Selective growth/etching of hybrid materials is very important for the rational synthesis of hierarchical structures and precise modulation of their physical properties. Here, the lateral etching of the core-shell Au@Ag nanorods is achieved by FeCl3 at room temperature, producing a number of dumbbell-like Ag-tipped Au nanorods. This selective etching at the side of the core-shell nanorods is attributed to the increased reactivity of the side facets, due to less surface passivation of cetyltrimethylammonium bromide. The similar synthetic strategy has also been demonstrated to be successful for the Pd-tipped Au nanorods that have not been reported before, indicating the great potential of this selective etching. The Ag-tipped Au nanorods are examined as a catalyst for the reduction of p-nitrophenol at room temperature. The Ag-tipped Au nanorods exhibit a higher catalytic activity than Au nanorods and core-shell Au@Ag nanorods, which could be attributed to the electronic effect and the unique structure in the Ag-tipped Au nanorods.