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ZnO nanorods (ZNRs) were grown onto silicon wafer substrates by hydrothermal method from different concentrations of precursors (zinc nitrate hexahydrate: hexamethylenetetramine) between 5-30 mM. It was found that the precursor concentrations affected the morphologies of ZNRs by increasing the length and diameter when the precursor concentrations were increased. These resulted morphologies depend on the crystal plane as understood in terms of the difference of critical concentrations between (0001) and (1010) planes, which related to the different surface energies between the crystal planes. The well-defined structures of ZNRs with high aspect ratio (AR) were successfully fabricated by hydrothermal method for precursor concentration of 10 mM. This best sample showed the superhydrophilic property after UV irradiation for 1 hour.
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