Defect-related photoluminescence and photocatalytic properties of porous ZnO nanosheets

被引：290

作者：

Liu, Di ^{[1
]}

Lv, Yanhui ^{[1
]}

Zhang, Mo ^{[1
]}

Liu, Yanfang ^{[1
]}

Zhu, Yanyan ^{[1
]}

Zong, Ruilong ^{[1
]}

Zhu, Yongfa ^{[1
]}

机构：

[1] Tsinghua Univ, Dept Chem, Beijing 100084, Peoples R China

来源：

JOURNAL OF MATERIALS CHEMISTRY A | 2014年 / 2卷 / 37期

基金：

国家高技术研究发展计划(863计划); 中国国家自然科学基金;

关键词：

ELECTRON-SPIN-RESONANCE; LAYERED DOUBLE HYDROXIDE; ZINC-OXIDE; MAGNETIC-RESONANCE; OPTICAL-PROPERTIES; GREEN PHOTOLUMINESCENCE; PARAMAGNETIC-RESONANCE; FACILE SYNTHESIS; NANOPARTICLES; GROWTH;

D O I：

10.1039/c4ta02678k

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：

A porous ZnO nanosheet with a near-rectangular morphology has been successfully prepared through a simple solvothermal-annealing method using Zn-5(OH)(6)(CO3)(2) as a pore-directing agent. Moreover, the features of ZnO can be easily tuned by changing the annealing temperature. The evolution of defects along with the increase of annealing temperature has been revealed as follows: the content of surface oxygen vacancy of the as-prepared samples first increases and then decreases, however, the content of impurities decreases gradually. A clear relationship between the defects and photoluminescence/photocatalytic characteristics of ZnO is observed. The defect-related emission mechanism of the visible photoluminescence (PL) for the as-prepared ZnO samples has been proposed. In addition, the samples also show good activities for photo-degradation of phenol under UV light irradiation. ZnO-500 degrees C (annealed at 500 degrees C) exhibits the best photocatalytic activity, which is superior to that of commercial ZnO. The photocatalytic activity can be greatly influenced by the relative concentration ratio of surface defects to bulk defects, crystallization performance and specific surface area.

引用

页码：15377 / 15388

页数：12

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