Synthesis,characterization and photoluminescence of ZnO spindles by polyvinylpyrrolidone-assisted low-temperature wet-chemistry process |
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Authors: | Pengfei Gu Xudong Wang Tao Li Huimin Meng Hongying Yu Zishuan Fan |
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Institution: | 1. Institute for Advanced Materials and Technology, University of Science and Technology Beijing, 30 Xueyuan Road, Beijing 100083, People''s Republic of China;2. Science and Technology on Reliability and Environmental Engineering Laboratory, Beijing Institute of Spacecraft Environment Engineering, 104 Youyi Road, Beijing 100094, People''s Republic of China |
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Abstract: | ZnO spindles were prepared by wet-chemistry process with surfactant polyvinylpyrrolidone at a low temperature of 35 °C. The morphologies and structures of the products were characterized by X-ray powder diffraction, field emission scanning electron microscopy, and high-resolution transmission electron microscopy. The addition of polyvinylpyrrolidone promoted the formation of ZnO crystal nuclei, and accelerated the growth rate of (0001) plane rich in Zn2+ ions. The as-obtained ZnO spindles were twin crystal wurtzite structures, with the size of 30 nm at the tips, 350–450 nm at the center, and 1–1.5 μm in length. The room-temperature photoluminescence results showed that surface effects played a major role in the luminescence of the ZnO spindles, which exhibited a broad violet–blue–green emission band related to deep level defects. We proposed a new growth mechanism, which might be useful for applications in synthesis of size- and shape-controlled ZnO crystals. |
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