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Issue 41, 2017
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Observation of superconductivity in 1T′-MoS2 nanosheets

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Studies on the preparation and physical properties of phase-pure 1T′-MoS2 are still scarce although a 1T′ phase MX2 (M = Mo and W; X = Se and Te) has recently been reported to be a Weyl semimetal, a quantum spin Hall insulator, and a superconductor. Herein, we report a perfect single-layer 1T′-MoS2 structure based on edge-sharing octahedra. Pure 1T′-MoS2 nanosheets were successfully prepared using LiMoS2 single crystals. The arrangement of zig-zag Mo–Mo chains in the 1T′-MoS2 layer evolved from that of parent Mo–Mo diamond-like chains in LiMoS2 crystals after the removal of all lithium ions. A well-defined 1T′-type lattice structure was observed and characterized by scanning transmission electron microscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy. Surprisingly, superconductivity with an onset transition temperature (Tc) of 4.6 K has been observed in the lithium-free 1T′-MoS2 nanosheets, which is not observed in semiconducting bulk or single-layer 2H-MoS2.

Graphical abstract: Observation of superconductivity in 1T′-MoS2 nanosheets

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The article was received on 17 Aug 2017, accepted on 18 Sep 2017 and first published on 19 Sep 2017

Article type: Paper
DOI: 10.1039/C7TC03749J
Citation: J. Mater. Chem. C, 2017,5, 10855-10860
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    Observation of superconductivity in 1T′-MoS2 nanosheets

    C. Guo, J. Pan, H. Li, T. Lin, P. Liu, C. Song, D. Wang, G. Mu, X. Lai, H. Zhang, W. Zhou, M. Chen and F. Huang, J. Mater. Chem. C, 2017, 5, 10855
    DOI: 10.1039/C7TC03749J

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