微波固相合成氧化锌纳米棒

Microwave-assisted Solid-state Synthesis of ZnO Nanorods

通过前驱体的微波固相热分解法快速合成了氧化锌纳米棒,其直径在60～385nm之间,长可达数微米.前驱体则通过一步室温固相反应制备.用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、能量色散X射线分析(EDX)和透射电子显微镜(TEM)对产物的结构和形貌进行了表征.同时,对氧化锌纳米棒的光致发光(PL)性能作了测试,结果表明在355nm处有一个明显的近带隙发射峰.另外,对比实验表明,微波辐射在氧化锌纳米棒的形成过程中起了关键性作用,并对其形成机理进行了初步探讨.

ZnO nanorods were successfully synthesized by microwave-assisted solid-state reaction, and the nanorods are about 60-385 nm in diameter and several microns in length. The precursor was obtained by one-step room temperature solid-state reaction between Zn（CH3COO）2·2H20 and Na2CO3 in the presence of PEG400. The products were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, energy dispersive X-ray spectroscopy （EDX） and transmission electron microscopy （TEM）. The photoluminescence （PL） spectrum of the ZnO nanorods exhibits a strong near-band-edge emission at 355 nm. Compared with conventional heating, microwave radiation played an important role in formation of ZnO nanorods. In addition, formation mechanism of such ZnO nanorods was also discussed in brief.