Resistance of Hall Sensors Based on Graphene to Neutron Radiation

Abstract

An in-situ study of Hall sensors based on singlelayered graphene in neutron fluxes of a nuclear reactor to the fluence of 1.5e20 n/sq,m was conducted. The sensitivity of the sensors to the magnetic field remained stable throughout the experiment, while the resistance changes correlated with the increase in sample temperature due to radiation heating. The experiment confirmed the theoretical expectations regarding the high stability of graphene sensors to neutron irradiation. Necessary further improvement of sensor technology to optimize their characteristics, as well as radiation testing to determine the maximum permissible neutron fluence.

The Comparison of InSb-Based Thin Films and Graphene on SiC for Magnetic Diagnostics under Extreme Conditions

“…However, it should be noted that over the past decade, almost all publications have focused on thin-film materials. Currently, there are only few scientific reports dealing with experimental results related to the influence of neutron radiation on graphene [ 16 , 17 , 50 ]. Therefore, such a comparison at the moment is quite limited and may only indicate certain trends.…”

“…Experimental data on the radiation resistance of graphene [ 16 , 17 , 50 ] show that both transferred graphene and epitaxial graphene can exhibit significant radiation resistance. However, QFS graphene on SiC has incomparable temperature properties in comparison to those of the transferred one.…”

“…The transferred graphene is not a thermally stable system. changes close to when the temperature changes by 20 °C [ 17 ]. Additionally, transferred graphene has a weaker adhesion to the dielectric layers than to the metal.…”

“…Additionally, transferred graphene has a weaker adhesion to the dielectric layers than to the metal. Thermal compression of the upper contacts, which occurs after metal deposition and/or welding of external leads, can further weaken the graphene adhesion [ 17 ]. The technology of transferred graphene is not sufficient for the needs of devices intended to operate in extreme conditions, taking into account their temperature factors.…”

“…Current research on materials capable of stably detecting magnetic fields under extreme conditions in tokamaks focuses mainly on thin films made of chromium [ 5 ], bismuth [ 8 , 9 , 10 ], gold, and antimony [ 11 , 12 ], but III-V compound semiconductors have also been investigated [ 13 , 14 , 15 ]. Furthermore, recent reports have also considered the viability of two-dimensional (2D) materials in the form of quasi-free-standing (QFS) epitaxial Chemical Vapor Deposition (CVD) graphene on semi-insulating silicon carbide (GR/SiC) [ 16 ] or CVD graphene transferred onto a sapphire substrate [ 17 ].…”