Study of Ni-Catalyzed Graphitization Process of Diamond by in Situ X-ray Photoelectron Spectroscopy

Author(s)
O. Romanyuk, M. Varga, S. Tulic, T. Izak, P. Jiricek, A. Kromka, V. Skakalova, B. Rezek
Abstract

Graphene on diamond has been attracting considerable attention due to the unique and highly beneficial features of this heterostructure for a range of electronic applications. Here, ultrahigh-vacuum X-ray photoelectron spectroscopy is used for in situ analysis of the temperature dependence of the Ni-assisted thermally induced graphitization process of intrinsic nanocrystalline diamond thin films (65 nm thickness, 50-80 nm grain size) on silicon wafer substrates. Three major stages of diamond film transformation are determined from XPS during the thermal annealing in the temperature range from 300 degrees C to 800 degrees C. Heating from 300 degrees C causes removal of oxygen; formation of the disordered carbon phase is observed at 400 degrees C; the disordered carbon progressively transforms to graphitic phase whereas the diamond phase disappears from the surface from 500 degrees C. In the well-controllable temperature regime between 600 degrees C and 700 degrees C, the nanocrystalline diamond thin film is mainly preserved, while graphitic layers form on the surface as the predominant carbon phase. Moreover, the graphitization is facilitated by a disordered carbon interlayer that inherently forms between diamond and graphitic layers by Ni catalyst. Thus, the process results in formation of a multilayer heterostructure on silicon substrate.

Organisation(s)
Physics of Nanostructured Materials
External organisation(s)
Czech Academy of Sciences, Czech Technical University in Prague (CTU)
Journal
The Journal of Physical Chemistry Part C (Nanomaterials and Interfaces)
Volume
122
Pages
6629-6636
No. of pages
8
ISSN
1932-7447
DOI
https://doi.org/10.1021/acs.jpcc.7b12334
Publication date
03-2018
Peer reviewed
Yes
Austrian Fields of Science 2012
Materials physics
Keywords
Portal url
https://ucris.univie.ac.at/portal/en/publications/study-of-nicatalyzed-graphitization-process-of-diamond-by-in-situ-xray-photoelectron-spectroscopy(452c7ea3-3b4f-4691-af9a-9ea76621b35b).html