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Citation: HE Jian, HUANG Yun-hua, ZHANG Yue, GU You-song, JI Zhen, ZHOU Cheng. Synthesis, Growth Mechanism and Microstructure of ZnO Nanocables[J]. Acta Physico-Chimica Sinica, ;2005, 21(06): 637-640. doi: 10.3866/PKU.WHXB20050612 shu

Synthesis, Growth Mechanism and Microstructure of ZnO Nanocables

1.
Department of Materials Physics and Chemistry； State Specialistic Laboratory on Solid Electrolytes and Metallurgical Testing Techniques, Beijing University of Science and Technology, Beijing 100083

Received Date: 22 October 2004
Available Online: 15 June 2005

ZnO nanocables were synthesized on ld coated silicon(100) substrate by zinc powder evaporation at 550 ℃. The source materials were pure zinc and tin powders with mass ratio of 1∶1 and the experiment was carried out under a constant flow of Ar(98%)/O₂(2%) gas mixture(300 sccm(standard cubic centimeters per minute) in a quartz tube. SEM images showed that the nanocables were obtained in large-scale and the diameters and lengths of the nanocables were about 50 nm and several micrometers respectively. XRD, TEM and EDX investigations confirmed the core-shell structure, i.e. the core zone was single crystalline ZnO and the shell zone was SiOx amorphous layer. Interestingly, the ZnO core was grown along a unique direction of [2021], which was quite different from the conventional fast growth direction of〈0001〉,〈0110〉 and 〈2110〉of 1D ZnO nanoscale materials. A possible mechanism was also proposed. Firstly, ld film served as catalyst and the nanocables grew out from the surface of Au-Si-Zn liquid alloys；secondly, tin powders were used as inhibitor to keep a low partial pressure of zinc vapor.
- Nanocables;ZnO;SiO_x;Synthesis;Growth mechanism
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