Aerospace & Defense Technology - December 2023 - 33

Tech Briefs
The Only Full EcoSystem of 3U & 6U
100GbE Products Aligned with SOSA
Modeling and Experimenting
with 2D Materials for CMOS
Type Devices and Digital
Integrated Circuits
Two-dimensional transition metal dichalcogenides
(2D-TMDs) have been proposed as novel optoelectronic
materials for space applications due
to their relatively light weight. MoS2 has been
shown to have excellent semiconducting and
photonic properties. Here, we report the effect of
gamma irradiation on the structural and optical
properties of a monolayer of MoS2.
Louisiana State University, Baton Rouge, Louisiana
G
raphene is a two-dimensional carbon material made of carbon
by covalent bonds, where carbon atoms are arranged in a honeycomb
lattice. Graphene has promising electronic and mechanical
properties. There are many processes available for the formation
of the graphene. CVD (Chemical Vapor Deposition) process
for the formation of graphene over the metal surface is most compatible.
Graphene is being investigated for its application in space
electronics. In space, there are many irradiation particles and
waves like x-rays, gamma rays, alpha particles, and beta particles.
Single particle like neutron can create single event upset in electronic
devices. Graphene can work as a radiation shielding material.
Graphene-metal, graphene and epsilon near zero metamaterials
structure can be used for electromagnetic wave absorbent.
Graphene/polymer, graphene/composite, graphene/epoxy
composite material can work as an electromagnetic interface
shielding material. Monolayer graphene may be used for electromagnetic
interface shielding. Graphene and its derivatives can be
used in biomedical applications like cancer imaging, and cancer
targeting with appropriate surface engineering done on graphene.
Graphene-Schottky junctions can work as low-bias radiation sensor.
Since graphene is a potential material to be used in electronic
devices, and radiation shielding applications, it is important to
study graphene in the irradiation environment. Effects of e-beam
irradiation on CVD grown graphene have been also studied.
We fabricated monolayer graphene over nickel and copper substrates
in Moorfield nanotechnology's nanoCVD-8G reactor by
CVD process. We have investigated defects and electronic behavior
of irradiated graphene by the Raman spectroscopy and X-ray
photo electron spectroscopy. Most of the Raman spectroscopy
studies have been done after the graphene transferred on to the
SiO2/Si substrate. That process requires lift-off and other chemical
processes. It can create wrinkles and defects in graphene film as
well as it may increase the impurity in graphene. It creates defects
at the interface which has major impact on device performance. In
our studies, we deposited graphene over transition metals (Ni, Cu).
Co-60 source was used for the irradiation purpose, which has
nominal irradiation dose of 207 rad/Min (±5%). We have irradiated
two samples of graphene grown on nickel substrate and
Aerospace & Defense Technology, December 2023
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Aerospace & Defense Technology - December 2023

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