Title of Paper:Nature of the 550 nm emission and d(0) ferromagnetism in ZnO nanocrystals revealed by H2O2 etching

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Affiliation of Author(s):航天学院

Journal:CRYSTENGCOMM

Key Words:ROOM-TEMPERATURE FERROMAGNETISM DOPED ZNO ZINC-OXIDE THIN-FILMS NANOPARTICLES NANORODS VACANCY

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 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.

ISSN No.:1466-8033

Translation or Not:no

Date of Publication:2017-05-07

Co-author:Liu, Yuan

Correspondence Author:lvjinpeng