Abstract
The introduction of ferromagnetism in MoS2 is important for its applications in semiconductor spintronics. MoS2 powders were synthesized by hydrothermal method, followed by the N plasma treatment at room temperature. Weak ferromagnetism with saturated ferromagnetic magnetization of 0.64 memu/g has been observed in the as-synthesized MoS2 at room temperature, which is significant enhanced to 3.67 memu/g after the N plasma treatment for the proper duration. X-ray photoelectron spectroscopy demonstrates the adsorption of N, and higher valence state of Mo than +4 due to the bonding with N after the N plasma treatment. First principle calculation has been performed to disclose the possible origin of ferromagnetism. One chemical adsorbed N ion on S ion may form conjugated π bonds with adjacent two Mo ions to have a total magnetic moment of 0.75 μB, contributing to the enhanced ferromagnetism.
Highlights
Two-dimensional transition metal dichalcogenides (TMDs) have attracted extensive interests due to their unusual electronic structure and physical properties, associated with their low dimensionality.1 As one of most studied TMDs, the molybdenum disulfide (MoS2), composed of triple layers: a Mo layer sandwiched between two S layers, have been widely studied and applied in various fields, such as photocatalytic hydrogen evolution,2 supercapacitor electrode,3 energy storage,4 field effect transistor (FET)5 etc
Weak ferromagnetism with saturated ferromagnetic magnetization of 0.64 memu/g has been observed in the as-synthesized MoS2 at room temperature, which is significant enhanced to 3.67 memu/g after the N plasma treatment for the proper duration
Based on the density functional theory (DFT) calculation, the conjugated π bonds scitation.org/journal/adv between the adsorbed N ions on S ions and adjacent Mo ions have been confirmed to be the origin of ferromagnetism
Summary
Two-dimensional transition metal dichalcogenides (TMDs) have attracted extensive interests due to their unusual electronic structure and physical properties, associated with their low dimensionality. As one of most studied TMDs, the molybdenum disulfide (MoS2), composed of triple layers: a Mo layer sandwiched between two S layers, have been widely studied and applied in various fields, such as photocatalytic hydrogen evolution, supercapacitor electrode, energy storage, field effect transistor (FET) etc. The exfoliation of bulk MoS2 to monolayer can enhance the photoluminescence quantum yield.. The trigonal pristine MoS2 exhibits macroscopically nonmagnetic behavior, for the 4d electrons of two Mo4+ ions are spin-antiparallel, leading to the zero net magnetic moment.. The creation of triple vacancies (VMo+2S) in monolayer MoS2 induces exceptional magnetic moment without strain manipulation, which has been demonstrated by Ataca et al.. When the tensile strain is applied, the monolayer MoS2 with two-sulfur vacancy (V2S) becomes ferromagnetic and metallic, exhibiting an unexpected magnetic moment of 7.45 μB and a spin reorientation transition.. Robust ferromagnetism in 2H-MoS2 nanoribbons with zigzag edges and MoS2 pyramids with higher density of zigzag edges have been investigated by theoretical calculations and demonstrated by experiments.. Scitation.org/journal/adv between the adsorbed N ions on S ions and adjacent Mo ions have been confirmed to be the origin of ferromagnetism
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