热氧化法合成ZnO纳米带及其光电特性研究

Synthesize of ZnO Nanobelt Arrays by Solid Thermal Oxidation with Au Catalyst

应用低于锌熔点的低温金属固态热氧化的方法，并结合金催化作用，成功地在金属锌基底上自发生长出了氧化锌纳米带阵列。应用X射线衍射，扫描电子显微镜，高分辩电子透射显微镜等技术对产物进行了观察研究。研究结果表明，金对纳米带形成具有明显的促进作用。合成的氧化锌纳米带的长度范围为6—14μm，厚度约为40nm，宽度范围为100～150nm，其顶部没有发现明显的金颗粒。XRD结果表明纳米带晶体结构为六方结构的ZnO，合成的纳米带的相结构很接近于无催化剂合成的ZnO纳米线。高分辨透射电镜观察显示部分纳米带结晶良好。通过对生长的氧化锌纳米带进行的光致发光（PL）测试，表明在PL光谱中可以看到紫外区，绿光波段有两个主要的峰。

ZnO nanobeh arrays were successfully synthesized on zinc substrate by low temperature （400℃ ） solid thermal oxidation of Zn with Au catalyst. XRD, SEM and HRTEM were used to examine and identify the morphology and the crystal structure of the nanobehs. The Au promotes the growing of the ZnO nanobelts obviously. The ZnO nanobelts have a thickness of 40 nm with widths of 100 to 150 nm and lengths of 6 to 14 μm. Not any gold particle were found on the tips of the nanobehs in HRTEM observations. XRD patterns show the crystal structure of the ZnO nanobehs is hexagonal, and the phase structure of ZnO nanobelts is similar to the ZnO nanowires synthesized by Au catalyst-free method. The PL measurements also took on the sample; two peaks can be seen in the PL spectra.