CAJ | 학술논문

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20～30 nm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5～11 nm,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.
침대목전채용용제열방법제비적ZnO납미구척촌비교대,이모판법제비기술우비교복잡적결점,용륙갑기차알(HDA)작위보조시제,채용용제열법제비출료소척촌적ZnO납미구.본방법불채임하모판,제비과정간단역조작,중복성호.재장발사전자현미경하가청초지간도소제득납미구척촌분포비교균균,매일개납미구도시유허다립경재20～30 nm적소구공동조성적.X사선연사결과표명소득산물균위륙각섬자광결구적ZnO.용사악공식산득적입자척촌재5～11 nm,이차수착제비시간적연장화제비온도적승고,ZnO격자흡수봉발생홍이,현시출명현적양자한제효응,저표명나사소구가능시유척촌경소적ZnO납미입자소조성.광치발광보중자외발사여가견발사적강도비수착제비시간적연장화제비온도적승고이대,표명ZnO납미입자적척촌증대,결정성변호.
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.