School of Photoelectric Information and Energy Engineering, Wuhan Institute of Technology, Wuhan, 430205, P. R. China.
School of Mathematics and Physics, China University of Geosciences (Wuhan), Wuhan 430074, Wuhan, P. R. China.
Dalton Trans. 2018 Dec 21;47(47):16969-16976. doi: 10.1039/c8dt03482f. Epub 2018 Nov 19.
Bimetallic nanoparticles are widely used in chemical catalysis and energy conversion. Their practical performance can be better exploited through morphological control by adjusting the synthetic strategy. Herein, an aqueous phase route is used to achieve the controlled preparation of bimetallic Au/Pt and hollow Au/Pt/Au nanotriangles with tunable plasmonic properties and superior photocatalytic activity. By continuously adjusting the concentration of surfactant solution, the gradual growth orientation of Pt nanoparticles on Au nanotriangles is observed, which occurs first on the tips, then on the edges, and then on the facets. Three types of Au/Pt nanotriangles (including Pt on the tips (Au/Pt (tips)), Pt on the edges (Au/Pt (edges)), and Pt covering Au (Au@Pt)) with tunable plasmon resonance are obtained. Then, Au/Pt/Au nanotriangles with a hollow structure are synthesized based on Au/Pt (edges). By evaluating the reduction rate of p-nitrophenol under visible light irradiation, hollow Au/Pt/Au nanotriangles exhibit the best photocatalytic activity compared with Au and Au/Pt (edges). The hollow structure, high visible light absorption and a strong tip- and center-focused local electric field of Au/Pt/Au are thought to be responsible for their superior photocatalytic activity.
双金属纳米粒子在化学催化和能量转换中得到了广泛的应用。通过调整合成策略来控制其形态，可以更好地发挥其实际性能。本文采用水相法实现了具有可调等离子体特性和优异光催化活性的双金属 Au/Pt 和中空 Au/Pt/Au 纳米三角的可控制备。通过不断调整表面活性剂溶液的浓度，观察到 Pt 纳米粒子在 Au 纳米三角上的逐渐生长取向，首先在尖端，然后在边缘，最后在晶面上。得到了三种具有可调等离子体共振的 Au/Pt 纳米三角（包括尖端的 Pt(Au/Pt(tips))、边缘的 Pt(Au/Pt(edges))和覆盖 Au 的 Pt(Au@Pt)）。然后，基于 Au/Pt(edges)合成了具有中空结构的 Au/Pt/Au 纳米三角。通过评估可见光照射下对 p-硝基苯酚的还原速率，中空 Au/Pt/Au 纳米三角表现出比 Au 和 Au/Pt(edges)更好的光催化活性。中空结构、高可见光吸收和 Au/Pt/Au 的尖端和中心聚焦局域电场被认为是其优异光催化活性的原因。
