Effect of Growth Time to the Structural and Field Emission Properties of ZnO Nanorods Prepared by Sol-Gel Method

The structural and field emission properties of ZnO nanorod at different growth time by sol-gel method have been successfully prepared. FESEM results illustrated that dense ZnO nanorods with hexagonal wurtzite structure were vertically well-aligned and uniformly distributed on the substrate. X-ray diffraction pattern analysis shows that all the obtained ZnO nanorods can be indexed to the hexagonal ZnO wurtzite structure. Field emission measurement was conducted for ZnO nanorod growth at different time to study emission properties. The turn-on field value decreases while field enhancement value increases as longer growth time was applied which related to the increasing of aspect ratio of ZnO nanorod respectively.