Abstract
A simple chemical solution process was used to prepare alumina nanoparticle-coated ZnOnanotubes (ANZTs). Transmission electron microscope (TEM) images proved that thealumina nanoparticles were uniformly dispersed on the ZnO nanotubes. After thermaltreatment at different temperatures under various atmospheres, photoluminescence (PL)measurements showed that the ANZTs emitted a variety of colors, including blue, greenand white light. Gaussian curve fitting of the PL spectra revealed that the competitionbetween the blue, blue-green, green and yellow band emissions and their relative emissionintensities were strongly associated with various defects. Blue emission was attributed tolarge numbers of oxygen defects in alumina, while green and yellow emissions wererelated to oxygen and zinc defects in ZnO, respectively. Under specific conditions,white light, consisting of blue, blue-green, green and yellow band emissions, wasobtained. Further TEM analysis indicated that the defect structure of ANZTscould be manipulated by the interface interaction between alumina and the ZnOnanotubes.
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