In this study, we fabricated the zinc oxide (ZnO) nanorods arrays by hydrothermal technique on indium doped tin oxide (ITO) substrate with different concentration of the precursor with zinc nitrate and hexamethyleneteramine (HMTA) in distilled water. Structure, morphology and optical properties of ZnOnanorods on ITO substrate were characterized by x-ray diffractometer, field-emission scanning electron microscope and spectrophotometer, respectively. The ZnO nanorod arrays showing preferentially oriented in the (001) direction and with a wurtzite structure. The scanning electron microscopy results showed that the hexagonal shape ZnO nanorods. It was found that the diameter, length and density of the ZnO nanorods arrays were strongly influenced by the precursor concentration.
In this study, we controlled nanostructure and morphologies of the vertically aligned zinc oxide nanowires (ZnO NWs) on 200 nm-thick zinc oxide seed layer. The ZnO nanowires were synthesized by the hydrothermal method at 90°C for 6 hours in the precursor solutions. The solutions with four different precursor concentrations of zinc nitrate and hexamethylenetetramine (HTMA) in distilled water were prepared at 5 to 20 mM. The effect of the precursor concentrations were systematically investigated based on the structural and morphologies of ZnO NWs. Most physical investigations were performed with grazing-incidence X-ray diffraction (GIXRD) and field-emission scanning electron microscopy (FE-SEM). From GIXRD, the peak intensity and full width at half maximum (FWHM) of the ZnO (002) were both increased as the precursor concentration was increased. It was also found that the diameter and length of the ZnO nanowires were increased with the increased precursor solution concentration. The average diameter and length of the ZnO NWs could be controlled from 60 to 135 nm and 0.39 to 1.73 μm, respectively.
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