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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

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Sub kGy photon irradiation alterations in graphite.

D A Bradley¹, Siti Nurasiah Mat Nawi¹, Mayeen Uddin Khandaker¹

¹Centre for Biomedical Physics, School of Healthcare and Medical Sciences, Sunway University, 47500, Bandar Sunway, Selangor, Malaysia.

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine

|April 24, 2020

Summary

Polymer pencil-lead graphite (PPLG) shows potential for radiation dosimetry. Its structural and luminescence changes after X-ray and gamma irradiation correlate with absorbed radiation dose.

Keywords:

Luminescence Photoluminescence spectroscopy Polymer pencil-lead graphite Trapping parameter X-ray diffraction

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Area of Science:

Materials Science
Radiation Physics
Solid State Physics

Background:

Polymer pencil-lead graphite (PPLG) is explored for its response to irradiation.
Understanding irradiation-induced structural and luminescence changes is crucial for material applications.

Purpose of the Study:

To analyze radiation-induced structural alterations and luminescence in PPLG.
To investigate the correlation between radiation dose and thermally stimulated emission.
To characterize the crystal structure and optical properties of irradiated PPLG.

Main Methods:

PPLG samples were exposed to X-ray (1-10 Gy) and gamma (30-200 Gy) irradiation.
Thermally stimulated emission was analyzed to estimate trapping parameters using Chen's peak-shape method.
X-ray diffractometry and photoluminescence spectroscopy were employed for structural and optical characterization.

Main Results:

Thermally stimulated emission intensity varied with PPLG diameter and radiation dose.
Mean atomic spacing was 0.3332 nm and degree of structural order was 26.6° for PPLG.
Photoluminescence spectra showed absorption at 602 nm and emission at 1074 nm, with a band gap of 1.113-1.133 eV.

Conclusions:

PPLG exhibits dose-dependent structural and luminescence responses to irradiation.
The material shows promise as a radiation dosimeter due to its sensitivity to absorbed energy.
Further research can optimize PPLG for specific radiation detection applications.