【作者】 黄勇；

【导师】 朱自强；

【作者基本信息】 华东师范大学 ， 光学， 2008， 硕士

【摘要】 作为宽带隙半导体材料,ZnO具有良好的化学稳定性和热稳定性,其优异的发光特性、场发射特性近年来得到了广泛重视。最近纳米氧化锌材料成为国内外研究的热点。本文主要研究了纳米氧化锌的制备及其结构、光致发光和电子场发射特性。主要内容和创新点如下:1.利用热蒸发气相输运方法,通过改变不同的工艺参数,在多种衬底(硅、玻璃、铜等)上成功制备了不同形貌的ZnO纳米结构,比较了不同生长参数对产品形貌的影响,分析了它们的生长机理,研究了它们的场发射性能。电子场发射测试表明,四角状纳米线样品开启电压为2.9V/μm,由于其顶端直径较小,获得1mA/cm~2发射电流的电场仅为5.4V/μm。杆状纳米线样品生长的定向性较好,但因其头部直径较大,其场发射开启电压为3.3V/μm;得到1mA/cm~2发射电流密度所需的电场为6.2V/μm,比四角状纳米线样品高。两类ZnO纳米线样品均具有较好的电子场发射稳定性,有望成为优良的电子场发射阴极。2.对导电玻璃衬底上生长图形化ZnO纳米结构进行研究,成功制备了单元面积约为400×100μm2的图形化阵列,单元排列规则,分布均匀一致,场发射性能良好,为实现场发射平板显示器的全玻璃封装提供了实验基础。3.用热蒸发法,通过低温—升温—高温三个阶段,制备出两种新颖的ZnO/ZnMgO异质结构。沿c轴择优生长,为单晶六角纤锌矿结构。新颖的结构和生长机理被系统地分析和讨论。此方法制备的微米棒具有较好的可重复性。更多还原

【Abstract】 Zinc oxide (ZnO), as wide band gap semiconductor material, has good thermal and chemical stability, and its excellent luminescence, field emission properties have attracted much attention. Recently, there has been increasing interest in ZnO nanomaterials due to their unique properties.In this thesis, we briefly investigate the synthesis and crystal structure, photoluminescence and field emission properties of ZnO nanomaterials. It mainly contains the following works and innovations:1. The ZnO nanostructure with different aspects have been synthesized in many kinds of substrates (silicon, glass, copper,etc.) using thermal evaporation vapor phase transport and changing different technical parameters. The effects on sample aspect using different growth parameter have been compared, and the growth mechanisms have been analyzed, and the field emission properties have also been researched. The electron field emission properties show that the tetrapod-like nanowires has a low turn-on field at 2.9 V/μm, an emission current density of 1 mA/cm~2 is achieved at 5.4 V/μm owing to better high aspect ratio. For the nanorod sample, the field to obtain a current density of 1 mA/cm~2 is higher (at 6.2 V/μm) than that of the nanotetapod sample due to its bigger diameter, and its turn-on field is 3.3 V/μm. Both the ZnO nanotetrapods and nanorods have good field emission stability. Results indicate that both of the two nanomaterials are likely to be good field emission cathode.2. The patterned ZnO nanostructures grown on ITO-glass substrate have been researched. The patterned array with the unit area of～400×100μm~2 has been fabricated. The units are ordered and distributed uniformly, and the field emission performance is excellent, thus providing experimental foundation for realizing the all-glass encapsulation of field emission panel display.3. Two kinds of novel ZnO/ZnMgO heterostructures were fabricated, using a simple thermal evaporation method, through processes of low-rising-high temperature. They have single hexagonal wurtzite structure and they grow along c axis direction. The novel heterostructures and mechanism have been analyzed and discussed systematically. This preparation of microrods has good repeatability.更多还原