Journal
CRYSTENGCOMM
Volume 19, Issue 17, Pages 2288-2293Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ce02456d
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Funding
- Natural Science Foundation of Jiangsu Province [BK20160787]
- China Postdoctoral Science Foundation
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Clarifying the origin of green photoluminescence and the room temperature ferromagnetism in ZnO is crucial for its potential application. In this work, we show that the characteristic 368 nm donor-bound exciton and the g = 1.96 electron spin resonance (ESR) signal in ZnO nanocrystals were eliminated after H2O2 oxidation, along with the appearance of 550 nm photoluminescence, unambiguously evidencing the creation of acceptor defects. Meanwhile, the d(0) ferromagnetism was significantly enhanced. In combination with the fact that ambient O-2 exposure also resulted in a significant boost of ferromagnetism in ZnO particles with different grain sizes, we surmise that adsorbed oxygen facilitates the d(0) ferromagnetism in ZnO while V-Zn causes the 550 nm green emission. This work illustrates that oxygen exposure is an efficient way to tune the physics in metal oxides through engineering defects.
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