Controlled Growth of Sulfide on Gold Nanotriangles with Tunable Local Field Distribution and Enhanced Photocatalytic Activity

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• 作者：Liang Ma ; Da-Jie Yang ; Zhi-Jun Luo ; Kai Chen ; Ying Xie ; Li Zhou ; Qu-Quan Wang
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：December 1, 2016
• 年：2016
• 卷：120
• 期：47
• 页码：26996-27002
• 全文大小：414K
• ISSN：1932-7455

文摘

Metal–semiconductor heteronanostructures have attracted increasing attention due to the strong interactions between the two nanoscale-spaced components. Herein, a steerable hydrothermal method is used to control the growth of Ag₂S shells onto Au nanotriangles with tunable plasmon resonance and local field distribution. Through adjusting pH value and sulfur source, three types of Au/Ag₂S heteronanostructures are obtained, including shells on the tips (Au/Ag₂S (tips)), shells on the sides (Au/Ag₂S (sides)), and complete shells (Au@Ag₂S). The surface plasmon resonance and local field confinement are demonstrated to vary with the shell position. Furthermore, compact CdS nanoshells are coated onto the Au@Ag₂S without any shape change of Au cores. By testing the photodegradation rate of Rhodamine B (RhB) under visible-light irradiation, the Au@Ag₂S@CdS hybrids exhibit enhanced photocatalytic activity compared with Au@CdS and CdS. The strong local electric field, the enhanced visible-light absorption, and the optimum band arrangement between Ag₂S and CdS are thought to be the main factors.