Synthesis of highly symmetrical BiOI single-crystal nanosheets and their {001} facet-dependent photoactivity

被引：224
作者：
Ye, Liqun [1 ]
Tian, Lihong [1 ]
Peng, Tianyou [1 ]
Zan, Ling [1 ]
机构：
[1] Wuhan Univ, Coll Chem & Mol Sci, Wuhan 430072, Peoples R China
来源：
JOURNAL OF MATERIALS CHEMISTRY | 2011年 / 21卷 / 33期
基金：
中国国家自然科学基金;
关键词：
VISIBLE-LIGHT IRRADIATION; PHOTOCATALYTIC ACTIVITY; I PHOTOCATALYSTS; ELECTRONIC-STRUCTURES; BR; CL; SURFACE; TIO2(110);
D O I：
10.1039/c1jm11005e
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：
Highly symmetrical BiOI single-crystal nanosheets (BiOI SCNs) with dominant exposed {001} facets (up to 95%) have been synthesized by annealing BiI(3) and characterized by X-ray diffraction, X-ray photoelectron spectroscopy, field emission scanning electron microscopy, transmission electron microscopy, selected area electron diffraction, high-resolution transmission electron microscopy, fast-Fourier transform pattern, UV-vis diffuse reflectance and photoluminescence. The thickness and the {001} facets percentage of BiOI SCNs can be tuned by changing the annealing temperature. The thermal decomposition process of BiI(3) and the formation mechanism of BiOI SCNs were investigated. BiOI SCNs exhibit higher photoactivity (about 7 times) than irregular BiOI for degradation of Rhodamine B (RhB) dye under visible light irradiation. The {001} facets are the reactive facets of BiOI. The origin of {001} facets-dependent photoactivity is due to an improvement of the separation efficiency of photo-induced electrons and holes.
引用
收藏
页码：12479 / 12484
页数：6
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