物理化学学报 >> 2005, Vol. 21 >> Issue (06): 637-640.doi: 10.3866/PKU.WHXB20050612

研究论文 上一篇    下一篇

ZnO纳米电缆的制备、结构和生长机理

贺建; 黄运华; 张跃; 顾有松; 纪箴; 周成   

  1. 北京科技大学材料物理与化学系, 北京 100083; 北京科技大学固体电解质冶金测试技术国家专业实验室, 北京 100083
  • 收稿日期:2004-10-22 修回日期:2005-01-11 发布日期:2005-06-15
  • 通讯作者: 张跃 E-mail:Yuezhang@pgschl.ustb.edu.cn

Synthesis, Growth Mechanism and Microstructure of ZnO Nanocables

HE Jian; HUANG Yun-hua; ZHANG Yue; GU You-song; JI Zhen; ZHOU Cheng   

  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:2004-10-22 Revised:2005-01-11 Published:2005-06-15
  • Contact: ZHANG Yue E-mail:Yuezhang@pgschl.ustb.edu.cn

摘要: 以混合的锌粉和锡粉作为原料, 通过热蒸发的方法在沉积有金膜的硅基片上制备出具有“芯线-壳层”同轴结构的ZnO/SiOx纳米电缆. 扫描和透射电镜的研究表明, 这种纳米电缆的产量很高, 长度达到数个微米, 并且确认了其“芯线-壳层”的独特结构. 不同于以往ZnO一维纳米材料的三个快速生长方向〈0001〉、〈0110〉及〈2110〉, 其ZnO芯线的生长方向为[2021]. 本实验中锡粉和金膜分别作为抑制剂和催化剂, 通过控制锌粉的蒸发速率以及金硅共熔反应使ZnO纳米电缆在硅基片上得到一维生长. 这种纳米电缆可望在纳米尺度的电路、电器以及力学和光学信号的耦合和转换方面得到应用.

关键词: 纳米电缆, 氧化锌, 氧化硅, 制备, 生长机理

Abstract: ZnO nanocables were synthesized on gold 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, gold 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.

Key words: Nanocables, ZnO, SiOx, Synthesis, Growth mechanism