Abstract
Hexagonal ZnO microrods and sub-microrods have been prepared throughthermal decomposition of an equimolar (0.1 M) aqueous solution ofZn(NO3)2.4H2O and (CH2)6N4 at90 degrees C for different times (10–46 h). The microrods were transformedinto hollow hexagonal ZnO microtubes when the growth time reached 46 h.The Raman spectra and the photoluminescent (PL) spectra were measured.The PL spectra of microrods consist of two strong narrow near-UV bandsat 380 nm and 400 nm assigned to free exciton emission and exciton–excitoncollision, respectively. The PL spectrum of ZnO microtubes show onlyone peak in the near-UV region with peak located at 380 nm with FWHM ofabout 20 nm assigned to free exciton emission. When the growth timeincreased, the peak intensity of near-UV band decreased.
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