Correlated Electrical Conductivities to Chemical Configurations of Nitrogenated Nanocrystalline Diamond Films

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dc.contributor.authorZkria, Abdelrahman
dc.contributor.authorGima, Hiroki
dc.contributor.authorAbubakr, Eslam
dc.contributor.authorMahmoud, Ashraf
dc.contributor.authorHaque, Ariful
dc.contributor.authorYoshitake, Tsuyoshi
dc.date.accessioned2022-11-22T18:17:05Z
dc.date.available2022-11-22T18:17:05Z
dc.date.issued2022-03-03
dc.description.abstractDiamond is one of the fascinating films appropriate for optoelectronic applications due to its wide bandgap (5.45 eV), high thermal conductivity (3320 W m−1·K−1), and strong chemical stability. In this report, we synthesized a type of diamond film called nanocrystalline diamond (NCD) by employing a physical vapor deposition method. The synthesis process was performed in different ratios of nitrogen and hydrogen mixed gas atmospheres to form nitrogen-doped (n-type) NCD films. A high-resolution scanning electron microscope confirmed the nature of the deposited films to contain diamond nanograins embedded into the amorphous carbon matrix. Sensitive spectroscopic investigations, including X-ray photoemission (XPS) and near-edge X-ray absorption fine structure (NEXAFS), were performed using a synchrotron beam. XPS spectra indicated that the nitrogen content in the film increased with the inflow ratio of nitrogen and hydrogen gas (IN/H). NEXAFS spectra revealed that the σ*C–C peak weakened, accompanied by a π*C=N peak strengthened with nitrogen doping. This structural modification after nitrogen doping was found to generate unpaired electrons with the formation of C–N and C=N bonding in grain boundaries (GBs). The measured electrical conductivity increased with nitrogen content, which confirms the suggestion of structural investigations that nitrogen-doping generated free electrons at the GBs of the NCD films.
dc.description.departmentEngineering
dc.formatText
dc.format.extent12 pages
dc.format.medium1 file (.pdf)
dc.identifier.citationZkria, A., Gima, H., Abubakr, E., Mahmoud, A., Haque, A., & Yoshitake, T. (2022). Correlated electrical conductivities to chemical configurations of nitrogenated nanocrystalline diamond films. Nanomaterials, 12(5), 854.
dc.identifier.doihttps://doi.org/10.3390/nano12050854
dc.identifier.issn2079-4991
dc.identifier.urihttps://hdl.handle.net/10877/16334
dc.language.isoen
dc.publisherMultidisciplinary Digital Publishing Institute
dc.rights.licenseThis work is licensed under a Creative Commons Attribution 4.0 International License.
dc.sourceNanomaterials, 2022, Vol. 12, No. 05, Article 854, pp. 1-12.
dc.subjectdiamond films
dc.subjectnanodiamond composite
dc.subjectphysical vapor deposition
dc.subjectNEXAFS spectra
dc.subjectIngram School of Engineering
dc.titleCorrelated Electrical Conductivities to Chemical Configurations of Nitrogenated Nanocrystalline Diamond Films
dc.typeArticle

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