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Platinum diselenide (PtSe2) is a promising transition metal dichalcogenide (TMDC) material with unique properties. It is necessary to find a controllable fabrication method to bridge PtSe2 with other two-dimensional (2D) materials for practical applications, which has rarely been reported so far. Here, we report that the selenization of Pt(111) can be suppressed to form a Se intercalated layer, instead of a PtSe2 monolayer, by inducing confined conditions with a precoating of graphene. Experiments with graphene-island samples demonstrate that the monolayer PtSe2 can be controllably fabricated only on the bare Pt surface, while the Se intercalated layer is formed underneath graphene, as verified by atomic-resolution observations with scanning transmission electron microscopy (STEM) and scanning tunneling microscopy (STM). In addition, the orientation of the graphene island shows a negligible influence on the Se intercalated layer induced by the graphene coating. By extending the application of 2D confined reactions, this work provides a new method to control the fabrication and pattern 2D materials during the fabrication process.

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Publication history
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Acknowledgements

Publication history

Received: 16 June 2020
Revised: 10 July 2020
Accepted: 16 July 2020
Published: 31 July 2020
Issue date: December 2020

Copyright

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature

Acknowledgements

We acknowledge financial support from the National Key Research and Development Program of China (Nos. 2016YFA0202300 and 2018YFA0305800), the National Natural Science Foundation of China (Nos. 61725107 and 61971035), Beijing Natural Science Foundation (Nos. 4192054 and Z190006), and Strategic Priority Research Program of the Chinese Academy of Sciences (Nos. XDB30000000 and XDB28000000).

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