Fast synthesize ZnO quantum dots via ultrasonic method |
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| Institution: | 1. College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China;2. Institute 53 of China’s Ordnance Industry, Jinan 250031, China;1. Department of Physics, University of the Free State, Bloemfontein ZA9300, South Africa;2. Department of Chemistry, University of the Free State, Bloemfontein ZA9300, South Africa;1. Amity Institute of Biotechnology, Amity University Uttar Pradesh (Lucknow Campus), Lucknow 226028, India;2. National Physical Laboratory, New Delhi 110056, India;3. Department of Physics, Institute of Science, Banaras Hindu University, Varanasi 221005, India;4. Department of Materials Science and NanoEngineering, Rice University, Houston, TX 77005, USA;5. Shizuoka University, 3-5-1, Johoku, Naka-ku, Hamamatsu 432-8011, JAPAN;1. School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China;2. School of Physics and Optoelectronics, Xiangtan University, Xiangtan 411105, China;1. Dental Materials Laboratory, School of Dentistry, Federal University of Rio Grande do Sul, Rua Ramiro Barcelos, 2492, Rio Branco, 90035-003, Porto Alegre, RS, Brazil;2. Laboratory of Pathology, School of Dentistry, Federal University of Rio Grande do Sul, Rua Ramiro Barcelos, 2492, Rio Branco, 90035-003, Porto Alegre, RS, Brazil |
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| Abstract: | Green emission ZnO quantum dots were synthesized by an ultrasonic sol–gel method. The ZnO quantum dots were synthesized in various ultrasonic temperature and time. Photoluminescence properties of these ZnO quantum dots were measured. Time-resolved photoluminescence decay spectra were also taken to discover the change of defects amount during the reaction. Both ultrasonic temperature and time could affect the type and amount of defects in ZnO quantum dots. Total defects of ZnO quantum dots decreased with the increasing of ultrasonic temperature and time. The dangling bonds defects disappeared faster than the optical defects. Types of optical defects first changed from oxygen interstitial defects to oxygen vacancy and zinc interstitial defects. Then transformed back to oxygen interstitial defects again. The sizes of ZnO quantum dots would be controlled by both ultrasonic temperature and time as well. That is, with the increasing of ultrasonic temperature and time, the sizes of ZnO quantum dots first decreased then increased. Moreover, concentrated raw materials solution brought larger sizes and more optical defects of ZnO quantum dots. |
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| Keywords: | Zinc oxide Colloidal quantum dots Ultrasonic method |
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