期刊
APPLIED SURFACE SCIENCE
卷 324, 期 -, 页码 842-848出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2014.11.054
关键词
Fern-like ZnO nanoleaf; Ultrasonication; Photoluminescence; Photocatalytic activity
类别
资金
- 973 Program [2009CB939705]
- National Natural Science Foundation of China [10674091, 11304025, 51172166]
- National Science Fund for Talent Training in Basic Science [J1210061]
Two-dimensional fern-like ZnO nanoleaves were synthesized by ultrasonicating zinc microcrystals in water. The morphology, crystal structure, optical property and photocatalytic activity of the fern-like ZnO nanoleaves were characterized with scanning electron microscopy, X-ray diffraction, transmission electron microscopy, photoluminescence spectroscopy and ultraviolet-visible spectroscopy, respectively. It is found that one fern-like ZnO nanoleaf is composed of one ZnO nanorod as the central trunk and a number of ZnO nanoplates as the side branches in opposite pairs along the central ZnO nanorod. The central ZnO nanorod in the fern-like nanoleaves is about 1 mu m long while the side-branching ZnO nanoplates are about 100 nm long and 20 nm wide. Further analysis has revealed that ZnO nanocrystals are the building blocks of the central ZnO nanorod and the side-branching ZnO nanoplates. Under identical conditions, fern-like ZnO nanoleaves exhibit higher photocatalytic activity in photodegrading methyl orange in aqueous solution than spherical ZnO nanocrystals. The first-order photocatalytic rate constant of the fern-like ZnO nanoleaves is about four times as large as that of the ZnO nanoparticles. The branched architecture of the hierarchical nanoleaves is suggested be responsible for the enhanced photocatalytic activity of the fern-like ZnO nanoleaves. (C) 2014 Elsevier B.V. All rights reserved.
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