Inducing High Coercivity in MoS2 Nanosheets by Transition Element Doping

Sohail Ahmed, Xiang Ding, Nina Bao, Pengju Bian, Rongkun Zheng, Yiren Wang, Peter Paul Murmu, John Vedamuthu Kennedy, Rong Liu, Haiming Fan, Kiyonori Suzuki, Jun Ding, Jiabao Yi

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MoS2 nanosheets were doped with vanadium (V) with a variety of concentrations using a hydrothermal method. Raman, X-ray photoelectron spectroscopy, and electron paramagnetic resonance results indicate the effective substitutional doping in MoS2. Without V doping, oxides such as MoO2 and MoO3 have been observed, whereas with 5 at% V doping, the oxide disappeared. Magnetic measurements show that room temperature ferromagnetism has been induced by V doping. Magnetization tends to increase with the increased V doping concentration. A very large coercivity up to 1.87 kOe has been observed in 5 at% vanadium doped MoS2, which may attribute to a combination effect of localized charge transfer between V and S ions, pinning effect due to the in-between defects, stress induced by doping, and shape anisotropy due to two-dimensional nature of MoS2 ribbons.

Original languageEnglish
Pages (from-to)9066-9074
Number of pages9
JournalChemistry of Materials
Issue number21
Publication statusPublished - 14 Nov 2017

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