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Citation: HUANG Yun-Hua, ZHANG Yue, HE Jian, DAI Ying, GU You-Song, JI Zhen, ZHAN Xiao-Yuan, ZHOU Cheng. Fabrication, Structures and Optical Property of ZnO Nanobelts Prepared by a Novel Zn-powder Evaporation Technique[J]. Acta Physico-Chimica Sinica, ;2005, 21(03): 239-243. doi: 10.3866/PKU.WHXB20050303 shu

Fabrication, Structures and Optical Property of ZnO Nanobelts Prepared by a Novel Zn-powder Evaporation Technique

1.
Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing　100083; State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing　100083

Received Date: 5 July 2004
Available Online: 15 March 2005

Uniform ZnO nanobelts and toothed-nanobelts were synthesized respectively through pure zinc powder evaporation without catalyst at temperature of 600 ℃. In each processing, the total gas flow rate of ar n and oxygen was 200～300 cm³•min^－1, and the fraction of oxygen was 1％～5％ according to changes of the conditions. The experiments indicated that the key of the preparation method is to control the flow rates and partial pressures of ar n, oxygen, and zinc vapor. The flow rates and partial pressures influenced the size of nanostructures, and more sensitively determined the belts with or without teeth. 　　Scanning electron microscopy (SEM) observations showed that the fabricated ZnO nanobelts had several types in morphology. The high-resolution transmission electron microscopy (HRTEM) images and selected area electron diffraction (SAED) patterns revealed that the ZnO nanobelts were single crystalline. HRTEM images and SAED patterns also suggested that the teeth of the toothed-nanobelts grew along the [0001] or [2110] direction, i. e., the teeth of such belts may grow in “c” or “a” direction, the backbones of the belts may grow in “a” or “c” direction accordingly. X-ray diffraction (XRD) investigations on the structures showed that all the deposited nanobelts on the silicon substrate were pure ZnO with hexa nal wurtzite structure. Investigations through HRTEM and XRD indicated that the growth of ZnO nanobelts was controlled by vapor-solid (VS) mechanism. 　　Photoluminescence(PL) spectrum of ZnO toothed-nanobelts at room temperature was measured and showed a UV emission at ～390 nm and a broad green emission with 4 subordinate peaks at 455～495 nm.
- ZnO nanobelts; Crystal growth; Vapor-solid mechanism; Nanostructures;Photoluminescence
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