【摘要】 针对目前采用溶剂热方法制备的ZnO纳米球尺寸比较大,而模板法制备技术又比较复杂的缺点,用六甲基次胺(HDA)作为辅助试剂,采用溶剂热法制备出了小尺寸的ZnO纳米球。本方法不采任何模板,制备过程简单易操作,重复性好。在场发射电子显微镜下可清楚地看到所制得纳米球尺寸分布比较均匀,每一个纳米球都是由许多粒径在20~30nm的小球共同组成的。X射线衍射结果表明所得产物均为六角纤锌矿结构的ZnO。用谢乐公式算得的粒子尺寸在5~11nm,而且随着制备时间的延长和制备温度的升高,ZnO激子吸收峰发生红移,显示出明显的量子限制效应,这表明那些小球可能是由尺寸更小的ZnO纳米粒子所组成。光致发光谱中紫外发射与可见发射的强度比随着制备时间的延长和制备温度的升高而大,表明ZnO纳米粒子的尺寸增大,结晶性变好。更多还原

【Abstract】 We developed a simple and easy method to prepare nanometer-sized ZnO spheres via solvothermal route at low temperature and concentration without template. The morphology of the as-prepared ZnO spheres recorded by FESEM revealed that these spheres were uniform in size. From the higher resolution FESEM images we could clearly observe that the ZnO nanospheres were actually composed of many even smaller ZnO nanospheres. We conducted the experiments at different reaction time and temperature, systematically investigated the effects of these reaction conditions on the structural and optical characteristics of these ZnO nanospheres. The formation mechanism of such ZnO nanospheres was also discussed.更多还原