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Effect of pH Values on the Morphology of Zinc Oxide Nanostructures and their Photoluminescence Spectra

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Morphology-controlled zinc oxide (ZnO) structures, including micrometer-sized rods, nanorods, urchin-like structure, flower-like structure, and fan-shaped structure, have been synthesized by a hydrothermal method without the use of a surfactant or an amine salt. The morphology control has been achieved by simply varying the solution pH value. The precursor used in the hydrothermal process was zinc carbonate hydroxide hydrate (Zn4CO3(OH)6┬ĚH2O). The solution pH value was varied through the addition of NaOH(aq) or HCl(aq). The mechanisms for the formation of different morphologies are discussed. Despite the difference in the morphology, the resulting ZnO nanostructures all exhibit violet emission from 379.7 nm (3.27 eV) to 404.9 nm (3.06 eV), which suggests the application of the ZnO nanostructures in violet light-emitting diodes.
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Document Type: Research Article

Affiliations: 1: Department of Materials Science, National University of Tainan, Tainan 70101, Taiwan 2: Department of Materials Science and Engineering, National Cheng Kung University, Tainan 70101, Taiwan

Publication date: March 1, 2011

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