The Field-Emission Characteristics of Zinc Oxide Nanorods

• Main Authors: Chan Kun Chi, 詹崑祺
• Other Authors: 李世鴻
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/38180354049230635020

碩士 === 大葉大學 === 電機工程學系 === 102 === In this study, zinc oxide (ZnO) nanorods grown by a hydrothermal method were characterized to study the effect of varying growth parameters on the field emission characteristics. ZnO nanorods were grown by the solution method on the silicon substrate in a 1:1 mixed solution of zinc nitrate hexahydrate, (Zn(NO3)2•6H2O) and hexamethylenetetramine (C6H12N4). In this study, ZnO nanorods were grown with the mixed solution at the concentrations of 0.02M, 0.04M, 0.06M, 0.08M, and 0.10M, respectively, while the growth temperature was fixed at 90˚C and the growth time was fixed at 120 minutes. From the field emission scanning electron microscope (FE-SEM) images, zinc oxide nanorods, with hexagonal pillar structure, have the radius of 49.7 ~ 162.2 nm. From the field emission measurement results, a higher field-emission current can be obtained for the ZnO nanorods grown by using the mixed solution of 0.02M. Subsequently, ZnO nanorods were grown for 100, 120, 140, 160, and 180 minutes, respectively, while the growth temperature was fixed at 90˚C and the concentration of the mixed solution was fixed at 0.002M. As can be clearly seen in FE-SEM images, the diameter of the ZnO nanorods is around 68.4 ~ 141.6 nm. From the field emission measurement results, it is clear that a higher field-emission current can be obtained for the ZnO nanorods grown for 160 minutes.