ZnO microtowers were synthesized on silicon substrate by the vapor-phase transport method at a low temperature of around 550 °C under atmospheric pressure. The microstructure and morphology of the ZnO microtowers were evaluated by using X-ray diffraction and scanning and transmission electron microscopies. The two-dimensional growth mechanism of the microtowers was investigated. Room temperature photoluminescence spectra of the microtowers showed a UV emission band centering at about 388 nm and wide green emissions around 500 nm. Field emission measurements demonstrated that the microtowers with sharp tips of several nanometers in curvature radius possessed good performance with a turn-on field of ∼1.8 V/μm and a threshold field of ∼4.8 V/μm.
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Xu et al. (2007) studied this question.
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