Correlated Electrical Conductivities to Chemical Configurations of Nitrogenated Nanocrystalline Diamond Films
| dc.contributor.author | Zkria, Abdelrahman | |
| dc.contributor.author | Gima, Hiroki | |
| dc.contributor.author | Abubakr, Eslam | |
| dc.contributor.author | Mahmoud, Ashraf | |
| dc.contributor.author | Haque, Ariful | |
| dc.contributor.author | Yoshitake, Tsuyoshi | |
| dc.date.accessioned | 2022-11-22T18:17:05Z | |
| dc.date.available | 2022-11-22T18:17:05Z | |
| dc.date.issued | 2022-03 | |
| dc.description.abstract | Diamond 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.department | Engineering | |
| dc.format | Text | |
| dc.format.extent | 12 pages | |
| dc.format.medium | 1 file (.pdf) | |
| dc.identifier.citation | Zkria, 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.doi | https://doi.org/10.3390/nano12050854 | |
| dc.identifier.issn | 2079-4991 | |
| dc.identifier.uri | https://hdl.handle.net/10877/16334 | |
| dc.language.iso | en | |
| dc.publisher | Multidisciplinary Digital Publishing Institute | |
| dc.rights.license | This work is licensed under a Creative Commons Attribution 4.0 International License. | |
| dc.source | Nanomaterials, 2022, Vol. 12, No. 05, Article 854, pp. 1-12. | |
| dc.subject | diamond films | |
| dc.subject | nanodiamond composite | |
| dc.subject | physical vapor deposition | |
| dc.subject | NEXAFS spectra | |
| dc.title | Correlated Electrical Conductivities to Chemical Configurations of Nitrogenated Nanocrystalline Diamond Films | |
| dc.type | Article |