Covalent Diamond-Graphite Bonding: Mechanism of Catalytic Transformation

Author(s)
Semir Tulic, Thomas Waitz, Maria Caplovicova, Gerlinde Habler, Marian Varga, Mario Kotlar, Viliam Vretenar, Oleksandr Romanyuk, Alexander Kromka, Bohuslav Rezek, Viera Skakalova
Abstract

Aberration-corrected transmission electron microscopy of the atomic structure of diamond graphite interface after Ni-induced catalytic transformation reveals graphitic planes bound covalently to the diamond in the upright orientation. The covalent attachment, together with a significant volume expansion of graphite transformed from diamond, gives rise to uniaxial stress that is released through plastic deformation. We propose a comprehensive model explaining the Ni-mediated transformation of diamond to graphite and covalent bonding at the interface as well as the mechanism of relaxation of uniaxial stress. We also explain the mechanism of electrical transport through the graphitized surface of diamond. The result may thus provide a foundation for the catalytically driven formation of graphene-diamond nanodevices.

Organisation(s)
Physics of Nanostructured Materials, Department of Lithospheric Research
External organisation(s)
Slovak University of Technology in Bratislava, Czech Academy of Sciences, Czech Technical University in Prague (CTU)
Journal
ACS Nano
Volume
13
Pages
4621-4630
No. of pages
10
ISSN
1936-0851
DOI
https://doi.org/10.1021/acsnano.9b00692
Publication date
04-2019
Peer reviewed
Yes
Austrian Fields of Science 2012
Electron microscopy, Materials physics
Keywords
Portal url
https://ucris.univie.ac.at/portal/en/publications/covalent-diamondgraphite-bonding-mechanism-of-catalytic-transformation(a8ea7d38-e029-4fc4-ab14-32c4664e10df).html