Open Access Nano Express

Ferromagnetism in exfoliated tungsten disulfide nanosheets

Xingze Mao1, Yan Xu2, Qixin Xue1, Weixiao Wang1 and Daqiang Gao1*

Author affiliations

1 Key Laboratory for Magnetism and Magnetic Materials of MOE, Lanzhou University, Lanzhou 730000, People’s Republic of China

2 Physics Department, Xinxiang University, Xinxiang 453003, People’s Republic China

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Citation and License

Nanoscale Research Letters 2013, 8:430  doi:10.1186/1556-276X-8-430

Published: 17 October 2013

Abstract

Two-dimensional-layered transition metal dichalcogenides nanosheets have attracted tremendous attention for their promising applications in spintronics because the atomic-thick nanosheets can not only enhance the intrinsic properties of their bulk counterparts, but also give birth to new promising properties. In this paper, ultrathin tungsten disulfide (WS2) nanosheets were gotten by liquid exfoliation route from its bulk form using dimethylformamide (DMF). Compared to the antiferromagnetism bulk WS2, ultrathin WS2 nanosheets show intrinsic room-temperature ferromagnetism (FM) with the maximized saturation magnetization of 0.004 emu/g at 10 K, where the appearance of FM in the nanosheets is partly due to the presence of zigzag edges in the magnetic ground state at the grain boundaries.

Keywords:
WS2; ferromagnetism; nanosheet