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Article

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Title

Graphene on SiC as a promising platform for magnetic field detection under neutron irradiation

Authors

[ 1 ] Instytut Fizyki, Wydział Inżynierii Materiałowej i Fizyki Technicznej, Politechnika Poznańska | [ P ] employee

Scientific discipline (Law 2.0)

[2.8] Materials engineering

Year of publication

2022

Published in

Applied Surface Science

Journal year: 2022 | Journal volume: vol. 590

Article type

scientific article

Publication language

english

Keywords
EN
  • graphene
  • hydrogen intercalation
  • quasi-free-standing
  • radiation-resistant materials
  • self-healing effects
  • density functional theory
Abstract

EN In this paper, we report on the first experimental study on the impact of neutron radiation on quasi-free-standing (QFS) graphene. For this purpose, we have fabricated hydrogen-intercalated QFS graphene on semiinsulating high-purity 4H-SiC(0001), passivated it with an Al2O3 layer, and exposed it to a fast-neutron fluence of ≈ 6.6 × 1017 cm−2. The results have shown that the graphene sheet is only moderately affected by the neutron radiation with the estimated defect density of ≈ 4 × 1010 cm−2. The low structural damage allowed the Al2O3/graphene/SiC system to maintain its electrical properties and an excellent sensitivity to magnetic fields characteristic of QFS graphene. Consequently, our findings suggest that the system may be a promising platform for magnetic diagnostics in magnetic-confinement fusion reactors. However, the scope of its use should be a subject of further study. In this context, we have explored possible modes of damage and have concluded that the main factor that affects the electrical parameters of the structure is the impact of neutrons on the layer of hydrogen atoms saturating the SiC(0001) surface. We have shown, employing density functional theory (DFT) computations, that damage to the intercalating layer could lower hole concentration in graphene via reduced charge polarization and local coupling on the interface.

Date of online publication

11.03.2022

Pages (from - to)

152992 - 1 - 152992 - 11

DOI

10.1016/j.apsusc.2022.152992

URL

https://www.sciencedirect.com/science/article/pii/S0169433222005608?via%3Dihub

Comments

Article Number: 152992

License type

Czasopismo hybrydowe

Ministry points / journal

140

Impact Factor

6,7

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