MgO单晶一维纳米结构的制备与表征

Synthesis and Characterization of MgO Single-Crystalline One-Dimensional Nanostructures

研究气相法制备MgO一维纳米结构的简单工艺途径。采用直接热蒸发镁粉的化学气相沉积法在不同条件下分别制备了MgO的纳米棒、纳米线、直角网络结构纳米线、晶须等单晶一维纳米结构。温度、氧分压和过饱和MgO蒸气压等参数对形貌具有重要影响。X射线衍射和选区电子衍射确定MgO纳米结构为立方晶系。扫描电镜和透射电镜对不同产物的形貌进行表征,显示其生长受到气—固生长机制控制。光致发光表明MgO纳米线在381 nm处出现强烈的紫色光发射宽峰。

The nanorods, nanowires, rectangular nanowires and whiskers of MgO were synthesized by thermal evaporation and chemical vapor deposition. The synthesis temperature, oxygen partial pressure and supersaturation of MgO vapor affected the morphology of the products. The MgO nanostructures was cubic by X-ray diffraction （XRD） and selective area electron diffraction （SAED）. The morphology of MgO nanostructures was observed by scanning electron microscopy （SEM） and transmission electron microscopy （TEM）. The MgO nanostructures was grown along the vapor-solid （VS） mechanism. Intensive ultra-light emission centered at 381 nm was observed by photo-luminescence （PL） measurement.