標題: Manipulate the Electronic and Magnetic States in NiCo2O4 Films through Electric-Field-Induced Protonation at Elevated Temperature
作者: Wang, Meng
Sui, Xuelei
Wang, Yujia
Juan, Yung-Hsiang
Lyu, Yingjie
Peng, Huining
Huang, Tongtong
Shen, Shengchun
Guo, Chenguang
Zhang, Jianbing
Li, Zhuolu
Li, Hao-Bo
Lu, Nianpeng
N'Diaye, Alpha T.
Arenholz, Elke
Zhou, Shuyun
He, Qing
Chu, Ying-Hao
Duan, Wenhui
Yu, Pu
材料科學與工程學系
Department of Materials Science and Engineering
關鍵字: ionic liquid gating;phase transformation;protonation;spinel
公開日期: 19-Apr-2019
摘要: Ionic-liquid-gating- (ILG-) induced proton evolution has emerged as a novel strategy to realize electron doping and manipulate the electronic and magnetic ground states in complex oxides. While the study of a wide range of systems (e.g., SrCoO2.5, VO2, WO3, etc.) has demonstrated important opportunities to incorporate protons through ILG, protonation remains a big challenge for many others. Furthermore, the mechanism of proton intercalation from the ionic liquid/solid interface to whole film has not yet been revealed. Here, with a model system of inverse spinel NiCo2O4, an increase in system temperature during ILG forms a single but effective method to efficiently achieve protonation. Moreover, the ILG induces a novel phase transformation in NiCo2O4 from ferrimagnetic metallic into antiferromagnetic insulating with protonation at elevated temperatures. This study shows that environmental temperature is an efficient tuning knob to manipulate ILG-induced ionic evolution.
URI: http://dx.doi.org/10.1002/adma.201900458
http://hdl.handle.net/11536/151892
ISSN: 0935-9648
DOI: 10.1002/adma.201900458
期刊: ADVANCED MATERIALS
Volume: 31
Issue: 16
起始頁: 0
結束頁: 0
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