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Issue 17, 2017
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Nature of the 550 nm emission and d0 ferromagnetism in ZnO nanocrystals revealed by H2O2 etching

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Abstract

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 d0 ferromagnetism was significantly enhanced. In combination with the fact that ambient O2 exposure also resulted in a significant boost of ferromagnetism in ZnO particles with different grain sizes, we surmise that adsorbed oxygen facilitates the d0 ferromagnetism in ZnO while VZn 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.

Graphical abstract: Nature of the 550 nm emission and d0 ferromagnetism in ZnO nanocrystals revealed by H2O2 etching

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Publication details

The article was received on 25 Nov 2016, accepted on 22 Mar 2017 and first published on 22 Mar 2017


Article type: Communication
DOI: 10.1039/C6CE02456D
Citation: CrystEngComm, 2017,19, 2288-2293
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    Nature of the 550 nm emission and d0 ferromagnetism in ZnO nanocrystals revealed by H2O2 etching

    J. Lv and Y. Liu, CrystEngComm, 2017, 19, 2288
    DOI: 10.1039/C6CE02456D

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