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Ultrason Sonochem. 2016 May;30:103-12. doi: 10.1016/j.ultsonch.2015.11.015. Epub 2015 Nov 14.

Fast synthesize ZnO quantum dots via ultrasonic method.

Author information

1
College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China. Electronic address: ywm13@163.com.
2
College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China.
3
College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China; Institute 53 of China's Ordnance Industry, Jinan 250031, China.
4
College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China. Electronic address: wanglixi@njtech.edu.cn.
5
Institute 53 of China's Ordnance Industry, Jinan 250031, China.
6
College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China. Electronic address: ngdzqt@163.com.

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.

KEYWORDS:

Colloidal quantum dots; Ultrasonic method; Zinc oxide

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