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Nucleation and growth of graphene/Mo 2 C heterostructures on Cu through CVD
Journal article   Open access   Peer reviewed

Nucleation and growth of graphene/Mo 2 C heterostructures on Cu through CVD

Furkan Turker, Omer R. Caylan and Goknur Buke
Journal of the American Ceramic Society, v 105(2), pp 815-822
Feb 2022
DOI: https://doi.org/10.1111/jace.18187
url
https://doi.org/10.1111/jace.18187View
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Abstract

activation energy CVD graphene Mo2C
We investigated the chemical vapor deposition synthesis of Mo 2 C/graphene heterostructures on a partially wetted liquid copper surface, studied the morphology of resulting phases using electron and optical microscopy, and determined the rate‐limiting step for the growth of Mo 2 C on graphene. The morphology of the Mo 2 C crystals varied from the center to the edge of the copper substrate because of the change in the Mo diffusion pathways owing to the variation in the thickness of the Cu substrate. Thin, hexagonal‐shaped crystals of Mo 2 C were found in the central region, where Cu is the thickest. In addition, the growth pressure substantially affects the nucleation and growth kinetics of both Mo 2 C and graphene. At high pressures (750 Torr), the graphene layer fully covered the Cu surface and Mo 2 C crystals formed with a regular shape, while at low pressures (5 Torr), the nucleation of both domains was suppressed, leading to the evolution of Mo 2 C crystals with irregular shapes. The activation energy for the growth of Mo 2 C on graphene was calculated to be 3.76 ± 0.3 eV, and the diffusion of Mo to the Cu surface through uncovered Cu or graphene vacancies/defects was determined to be the rate‐limiting step.

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Materials Science, Ceramics
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