Ye Wei, Guo Xia, Xie Fang, Zhu Rui, Zhao Qing, Yang Jian
Key Laboratory of Colloid and Interface Chemistry, Ministry of Education and School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, P.R. China.
Nanoscale. 2014 Apr 21;6(8):4258-63. doi: 10.1039/c3nr05775e. Epub 2014 Mar 10.
Controlled growth of hybrid metallic nanocomposites for a desirable structure in a combination of selected components is highly important for their applications. Herein, the controllable growth of RhAg on the gold nanorods is achieved from the dumbbell-like RhAg-tipped nanorods to the brushy RhAg-coated nanorods, or the rod-like Au@Ag-Rh nanorattles. These different growth modes of RhAg on the gold nanorods are correlated with the reducing kinetics of RhCl₃ and AgNO₃. In view of the promising catalytic properties of Rh, the gold nanorods modified by RhAg in different structures are examined as catalysts for the oxidation of o-phenylenediamine. It is found that brushy RhAg-coated nanorods present a higher catalytic efficiency than dumbbell-like RhAg-tipped nanorods and rod-like Au@Ag-Rh nanorattles. These results would benefit the overgrowth control on the one-dimensional metallic nanorods and the rational design of new generation heterogeneous catalysts and optical devices.
对于混合金属纳米复合材料而言，在选定组分组合中实现具有理想结构的可控生长对其应用至关重要。在此，实现了RhAg在金纳米棒上的可控生长，从哑铃状RhAg尖端纳米棒到刷状RhAg包覆纳米棒，再到棒状Au@Ag-Rh纳米摇铃。RhAg在金纳米棒上的这些不同生长模式与RhCl₃和AgNO₃的还原动力学相关。鉴于Rh具有良好的催化性能，对不同结构的RhAg修饰的金纳米棒作为邻苯二胺氧化催化剂进行了研究。发现刷状RhAg包覆纳米棒比哑铃状RhAg尖端纳米棒和棒状Au@Ag-Rh纳米摇铃具有更高的催化效率。这些结果将有助于一维金属纳米棒的过度生长控制以及新一代多相催化剂和光学器件的合理设计。
