不同条件制备的ZnO纳米梳结构及其性能研究

采用热蒸发法通过改变衬底放置条件在Si(111)衬底上制备出了ZnO纳米梳结构.利用X射线衍射(XRD)、扫描电子显微镜(SEM)、分光光度计、场发射装置对样品的结构、形貌、光致发光光谱及场发射特性进行了分析.XRD结果表明衬底水平放置(A)和衬底竖直放置(B)制备出的样品均属于多晶六角纤锌矿结构.SEM结果表明两种衬底放置条件下的样品均为纳米梳状结构,改变衬底放置条件ZnO纳米梳的尺寸和形貌有明显改变,其中竖直放置衬底的样品B纳米尺寸较小且比较均匀.室温下的光致发光光谱表明样品B的紫外峰较样品A出现了蓝移,此外样品B的紫外峰强和可见光峰强比值较大,说明此样品的结晶质量较好.场发射特性测试结果表明两个样品的场发射都是通过电子隧道效应进行的,且样品B的场发射性能优于样品A.

Preparation and Properties of the ZnO Nanocombs

The ZnO nanocombs have been successfully synthesized on Si (111) substrates with different substrate placed conditions by thermal evaporation method. The XRD, SEM, specrophotometer and field emission testing device are used to investigate the morphology, structure, photoluminescence and field emission properties of the ZnO nanocombs. XRD results indicates that both of the two samples under different substrate placed conditions(A:horizontal and B:vertical)belong to polycrystalline hexagonal structure. SEM results show that both of the two samples have nanocomb structure, but the size and the surface morphology of the nanocombs change with the different substrates placed conditions. The nanocombs in sample B are smaller and uniform. The room temperature photoluminescence(PL) spectra results show that the UV emission peak of the sample B appears blue shift in comparison to that in sample A, and the ratio of the UV emission peak to the visible emission peak in sample B is larger, indicating the high crystallization quality. Besides, The field emission test results show that the field emission of the both two samples conduct through the electronic tunnel effect, and the field emission performance of sample B is better.