Shape-dependent localized surface plasmon enhanced photocatalytic effect of ZnO nanorods decorated with Ag

被引：45
作者：
Zhang, Xiaoli [1 ]
Zhao, Junliang [1 ]
Wang, Shuguo [1 ]
Dai, Haitao [1 ]
Sun, Xiaowei [2 ]
机构：
[1] Tianjin Univ, Sch Sci, Tianjin Key Lab Low Dimens Mat Phys & Preparing T, Tianjin 300072, Peoples R China
[2] Nanyang Technol Univ, Sch Elect & Elect Engn, Singapore 639798, Singapore
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2014年 / 39卷 / 16期
基金：
中国国家自然科学基金; 高等学校博士学科点专项科研基金;
关键词：
Localized surface plasmon resonance (LSPR); Photocatalytic effect; ZnO nanorods; Ag nanoprisms; Water splitting; NANOWIRE ARRAYS; MODIFIED TIO2; SOLAR; PHOTOELECTRODES; NANOSTRUCTURES; ARCHITECTURE;
D O I：
10.1016/j.ijhydene.2014.03.153
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
We report shape-dependent localized surface plasmon enhanced photocatalytic effect of ZnO nanorods decorated with Ag nanostructures. The plasmonic ZnO photoelectrode modified by Ag nanoprisms exhibits a significant enhancement in photoelectric conversion with a maximum photoconversion efficiency of 1.45%. The photocurrent intensity (at 0.5 V vs. Ag/AgCl) of ZnO-Ag nanoprisms is 3.1 and 10 times greater than that of ZnO-Ag nanoparticles and as-grown ZnO nanorods, respectively. Moreover, ZnO-Ag nanoprisms showed a fast photoresponse due to the fast transport of photogenerated charge carriers in ZnO nanorods with a low recombination rate. It is suggested that the mechanism of photocatalytic enhancement by Ag nanoprisms is mainly ascribed to the significantly enhanced plasmonic 'hotspots' in sharp tips of nanoprisms. Such shape-dependent localized surface plasmon effect is further confirmed by FDTD simulation, which revealed that Ag nanoprisms showed stronger electromagnetic field intensity than that of Ag nanoparticles. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：8238 / 8245
页数：8
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