Abstract
The growth of hydrogenated sp3-phase of diamond on the sp2-phase of graphite by Microwave Plasma Enhanced Chemical Vapour Deposition (MPECVD) is a challenge, primarily because hydrogen etches graphite much faster than the growth rate of diamond. To enhance nucleation of diamond on graphite, we used a plethora of techniques such as plasma etching, ion bombardment, manual scratching, and scratching by ultrasonic agitation. Nanocrystalline and polycrystalline diamond thin-films were grown by MPECVD on the surface of pre-treated or pristine graphite using 1.5, 3.0, and 3.6 kW microwave power. Samples were characterised by Scanning Electron Microscopy, Raman Spectroscopy, and X-ray Photoelectron Spectroscopy. Species in the gas phase during film deposition were monitored by Optical Emission Spectroscopy. We have found that the surface area covered and the morphology of the diamond films are dependent on the surface pre-treatment. The crystallite size of the films depends on the microwave power used during MPECVD growth. The results of this study establish the protocols for diamond deposition by MPECVD on graphite substrates with a desired crystalline quality based on the pre-treatment of the substrate and the microwave power used during MPECVD. These results are important to modern applications, such as plasma facing materials, in which diamond has shown outstanding performance in contrast to that of graphite.
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Notes
National Institute of Standards and Technology Atomic Spectra Database, http://physics.nist.gov/PhysRefData/ASD/index.html, (2016).
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Acknowledgements
I.V. was supported by CONACYT and by the Programme Alβan, the European Union Programme of High Level Scholarships for Latin America, scholarship No. E05D056416MX. Funding from EPSRC (E/035868/1) is also gratefully acknowledged. Dr. Carlos Torres–Torres for his technical help in the writing of this article and M.C. Victor Valles-Gomez for proof reading the article.
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Villalpando, I., John, P., Porro, S. et al. Deposition of polycrystalline and nanocrystalline diamond on graphite: effects of surface pre-treatments. Appl. Phys. A 123, 183 (2017). https://doi.org/10.1007/s00339-017-0819-3
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DOI: https://doi.org/10.1007/s00339-017-0819-3