期刊
SMALL
卷 13, 期 39, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201701389
关键词
first-principles calculations; Mn-doped MoS2 nanosheets; room-temperature ferromagnetism; self-purification effect; supercritical hydrothermal reaction
类别
资金
- National Natural Science Foundation of China [11435012, U1632263, 21533007]
- Foundation for Innovative Research Groups of the National Natural Science Foundation of China [11621063]
Doping atomically thick nanosheets is a great challenge due to the self-purification effect that drives the precipitation of dopants. Here, a breakthrough is made to dope Mn atoms substitutionally into MoS2 nanosheets in a sulfur-rich supercritical hydrothermal reaction environment, where the formation energy of Mn substituting for Mo sites in MoS2 is significantly reduced to overcome the self-purification effect. The substitutional Mn doping is convincingly evidenced by high-angle annular dark-field scanning transmission electron microscopy and X-ray absorption fine spectroscopy characterizations. The Mn-doped MoS2 nanosheets show robust intrinsic ferromagnetic response with a saturation magnetic moment of 0.05 mu(B) Mn-1 at room temperature. The intrinsic ferromagnetism is further confirmed by the reversibility of the magnetic behavior during the cycle of incorporating/removing Li codopants, showing the critical role of Mn 3d electronic states in mediating the magnetic interactions in MoS2 nanosheets.
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