Abstract
ZnO microtubes were successfully synthesized by employing zinc acetate dihydrate as the starting material under hydrothermal condition. The ZnO microtubes were characterized by X-ray diffraction, scanning electron microscopy and high-resolution transmission electron microscopy. The results showed that the as-prepared ZnO microtubes were hexagonal and single crystal in nature and grew on Si (1 1 1) substrates along the [0 0 0 2] direction, which have diameters of about 3 μm, lengths of 10–20 μm, and wall thickness of 80 nm. Optical properties of the ZnO microtubes were investigated by temperature-dependent photoluminescence (PL) spectroscopy. The PL spectrum at 82.2 K shows a strong UV emission from the near band-edge with a negligible visible emission from deep level, and donor bound exciton (D 0X), free exciton (FX) and its phonon replica were observed in the UV-region. The PL spectra were dominated by the FX emission throughout the whole temperature range, and the energies of FX transitions and D 0X transitions are close to that of the bulk values of ZnO.
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