Effect of Growth Condition on Charactristic of ZnO nanorods

Well-aligned ZnO nanorods array have been synthesized through chemical bath deposition at law temperature (less than 120oC) using seed layer under different condition such as bath concentration and temperature, growth time, thickness of seed layer and it’s annealing. Structural, morphological, chemical and optical properties of ZnO nanorods array were studied by X-ray diffractometry, field emission-scanning electron microscopy/energy dispersive X-ray spectroscopy (FE-SEM/EDX) and UV-Vis-near IR optical absorption spectroscopy, respectively.The post-synthesized thermal treatment results in increased crystalline quality of nanorods as vertical c preffered orientation. The height, mean diameter and density of strongly well-oriented ZnO nanorods array are 190nm, 31-52 nm and 290-413 rods/μm2 on ZnO seed layer, respectively. The annealing of nanorods at 400oC causes to decrease in bandgap energy from 3.29eV for the as-grown nanorods to 3.19 eV. The increase in bath temperature to 110oC results in random direction of nanorods and decreasing in bandgap energy. The annealing of seed layer at temperature range of 200-600oC causes to increase in mean diameter and decrease in nanorods height and concentration and bandgap energy. The decrease in seed layer thickness causes to decrease in nanorods concentration.