Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 139, Issue 14, Pages 5242-5248Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.7b01903
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Funding
- National Basic Research Program of China [2015CB932302]
- National Natural Science Foundation of China [21501164, U1432133, U1632154, 11321503, J1030412]
- National Young Top-Notch Talent Support Program
- Chinese Academy of Sciences [XDB01020300]
- Fok Ying-Tong Education Foundation, China [141042]
- Fundamental Research Funds for the Central Universities [WK2060190027, WK234-0000065, WK2310000055]
- Anhui Provincial Natural Science Foundation [1608085QA08]
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Electronic state transitions, especially metal insulator transitions (MIT), offer physical properties that are useful in intriguing energy applications and smart devices. But to-date, very few simple metal oxides have been shown to undergo electronic state transitions near room temperature. Herein, we demonstrate experimentally that chemical induction of double-exchange in two-dimensional (2D) nanomaterials brings about a MIT near room temperature. In this case, valence-state regulation of a 2D MnO2 nanosheet induces a Mn(III)-O-Mn(IV) structure with the double-exchange effect, successfully triggering a near-room-temperature electronic transition with an ultrahigh negative magneto-resistance (MR). Double-exchange in 2D MnO2 nanomaterials exhibits an ultrahigh MR value of up to -11.3% (0.1 T) at 287 K, representing the highest reported negative MR values in 2D nanomaterials approaching room temperature. Also, the MnO, nanosheet displays an infrared response of 7.1% transmittance change on going from 270 to 290 K. We anticipate that dimensional confinement of double-exchange structure promises novel magneto-transport properties and sensitive responses for smart devices.
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