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Phase transition and in situ construction of lateral heterostructure of 2D superconducting α/β Mo2C with sharp interface by electron beam irradiation

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Abstract

Lateral heterostructures of 2D materials have several interesting properties and potential applications, and they are usually fabricated by chemical vapor deposition. However, it still remains a great challenge to fabricate 2D lateral heterostructures with well-controlled patterns and sharp interfaces. Herein, we found that the 2D α-Mo2C crystal, a recently emerging 2D superconductor, experiences a phase transition from the α phase to β phase on electron beam irradiation in a transmission electron microscope because of the migration of carbon atoms among the molybdenum octahedrons. Combined with first-principles calculations, the carbon atom migration paths and the corresponding energy barriers were discussed. Utilizing this unique phase transition property of 2D α-Mo2C crystal, we demonstrated the precise in situ construction of the lateral heterostructure of 2D superconducting α/β Mo2C with a well-controlled pattern and sharp interface using advanced aberration-corrected scanning transmission electron microscopy.

Graphical abstract: Phase transition and in situ construction of lateral heterostructure of 2D superconducting α/β Mo2C with sharp interface by electron beam irradiation

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Publication details

The article was received on 06 Mar 2017, accepted on 30 Apr 2017 and first published on 03 May 2017


Article type: Paper
DOI: 10.1039/C7NR01609C
Citation: Nanoscale, 2017, Advance Article
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    Phase transition and in situ construction of lateral heterostructure of 2D superconducting α/β Mo2C with sharp interface by electron beam irradiation

    Z. Liu, Z. Fei, C. Xu, Y. Jiang, X. Ma, H. Cheng and W. Ren, Nanoscale, 2017, Advance Article , DOI: 10.1039/C7NR01609C

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