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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 18    No. 1    January 2008

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Synthesis of tetrapod-shaped ZnO whiskers and microrods in one crucible by thermal evaporation of Zn/C mixtures
DU Guo-ping(杜国平)1, LI Wang(李 旺)1, FU Min-gong(付敏恭)2, CHEN Nan(陈 楠)1,FU Xue(付 雪)3, WAN Yi-qun(万益群)2, YAN Ming-ming(严明明)1

1. School of Materials Science and Engineering, Nanchang University, Nanchang 330031, China;2. Center for Analysis and Testing, Nanchang University, Nanchang 330047, China;3. Department of Systems Science, Jiangxi University of Finance and Economics, Nanchang 330013, China

Abstract:Tetrapod-shaped ZnO whiskers and microrods were synthesized in one crucible by thermal evaporation of Zn/C mixtures at 930 ℃ in air without any catalyst. The digital camera, optical microscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy, and X-ray diffraction techniques were used to study the morphologies and crystal structures of these tetrapod-shaped ZnO microcrystals. The results show that these two types of ZnO tetrapods are grown at different heights within the same crucible. The legs of these tetrapod-shaped ZnO crystals are hexagonally faceted. Some tetrapod-shaped ZnO whiskers show hierarchical structures. A short button-like hexagonal ZnO microcrystal is observed at the triple junctions of some tetrapod-shaped ZnO whiskers. The tetrapod-shaped ZnO microrods are capped by two sets of hexagonal pyramids with two different groups of crystal planes for the surfaces. These two types of tetrapod-shaped ZnO microcrystals have different side faces and aspect ratio, which are believed to be the result of their different growth behaviors. The octa-twin model was used to discuss the different growth behaviors of these two types of ZnO tetrapods. The crystal planes of the legs and the pyramids were determined.

 

Key words: ZnO; tetrapod-shaped whiskers; tetrapod-shaped microrods; growth from vapor; octa-twin model

ISSN 1672-7029
CN 43-1423/U

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