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以硝酸锌[Zn(NO3)2.6H2O]和尿素[CO(NH2)2]作前驱体,通过微波诱导燃烧技术可控合成具有不同形貌的ZnO纳米晶体,并用热重分析和差热分析进行了研究。对各种生长条件:微波功率,辐射时间和尿素/Zn2+物质的量的比对ZnO纳米晶体形貌的影响作了分析。结果表明:尿素/Zn2+物质的量的比对ZnO纳米材料的形貌具有显著影响。X衍射图表明合成的ZnO纳米结构呈六角形。傅里叶变换红外光谱图中400~500 cm-1处明显的峰为Zn-O的振动峰。ZnO纳米结构的发光光谱在366 nm的带边发射,因缺陷又由许多可见光发射峰组成。用扫描电子显微镜、透射电子显微镜、选区电子衍射研究了花状ZnO纳米结构的增长机理。本方法仅需几分钟就获得的了ZnO纳米结构。
ZnO nanocrystals with different morphologies were prepared by microwave induced combustion technique using zinc nitrate [Zn (NO3) 2.6H2O] and urea [CO (NH2) 2] as precursors, and were characterized by thermogravimetric analysis and differential thermal analysis Study. The effects of microwave power, irradiation time and the amount of urea / Zn2 + on the morphology of ZnO nanocrystals were analyzed. The results show that the ratio of the amount of urea / Zn2 + has a significant effect on the morphology of ZnO nanomaterials. The X-ray diffraction pattern shows that the synthesized ZnO nanostructures are hexagonal. The obvious peak at 400 ~ 500 cm-1 in Fourier transform infrared spectroscopy is the vibrational peak of Zn-O. The emission spectrum of the ZnO nanostructures is emitted at a band edge of 366 nm due to the defect consisting of many visible emission peaks. The growth mechanism of flower-like ZnO nanostructures was investigated by scanning electron microscopy, transmission electron microscopy and selected area electron diffraction. The ZnO nanostructures obtained in this method in just a few minutes.