The role of hydrothermal pathways in the evolution of the morphology of ZnO crystals |
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| Affiliation: | 1. Jožef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia;2. Department of Materials Science and Engineering, Anadolu University, 26000 Eskisehir, Turkey;3. Tofas R&D, Department, 16369 Bursa, Turkey;4. National Institute of Chemistry Slovenia, Hajdrihova 19, 1000 Ljubljana, Slovenia;1. Shenzhen Key Laboratory of Advanced Materials, Department of Materials Science and Engineering, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, China;2. College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, China;3. Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Madras, Chennai 600036, India;1. School of Electronic and Information Engineering, Hefei Normal University, Hefei 230601, China;2. School of Physics and Material Science, Anhui University, Hefei 230039, China;1. Department of Civil Engineering, Anadolu University, 26555 Eskisehir, Turkey;2. Department of Materials Science and Engineering, Anadolu University, 26555 Eskisehir, Turkey;3. Research Institute of Earth and Space Sciences, Anadolu University, 26555 Eskisehir, Turkey;1. Shenzhen Key Laboratory of Advanced Materials, Department of Materials Science and Engineering, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, China;2. College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, China;3. Nanotechnology Laboratory, Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Madras, Chennai 600036, India;1. Shenzhen Key Laboratory of Advanced Materials, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518 055, People’s Republic of China;2. Nanotechnology Laboratory, Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Madras, Chennai 600 036, India;1. School of Material Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China;2. Department of Materials Science and Engineering, University of Washington, Seattle, WA 98195, USA |
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| Abstract: | Understanding growth mechanisms usually leads to the successful preparation of a targeted microstructure. However, the large number of parameters that influence the shape and the size of nanostructures often make it difficult to predict the outcome. We investigated the growth of wurtzite-type ZnO by closely following such a multistage process. We associated the diverse morphology of the precipitated crystals, prepared under the same hydrothermal conditions, to the differences in the transient crystallization processes during the precipitation. By altering the pH of the suspension after the precipitation, we gain control over the resulting morphology of the ZnO and show how to grow identical crystallites with different shapes and crystal sizes. Here we report, for the first time, on how ZnO platelets grow in a certain Zn2+/OH− ratio along the basal and one of the prismatic directions to form sphalerites with very high surface area. We also offer an explanation as to how sphere-like hierarchical structures composed of plate- or rod-like ZnO crystals form through self-assembly driven processes. |
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| Keywords: | Precipitation Hydrothermal D: zinc oxide Crystal growth mechanism |
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