Raman spectroscopy of electron irradiated Multi-Walled Carbon Nanotube for dosimetry purposes

In this experimental work, dosimetry characteristics of Multi-Walled Carbon Nanotube (MWCNT), including linearity, repeatability, and long-term stability, were carried out using a 10 MeV electron-beam at various absorbed doses of 0, 10, 20, 30, 50, 80, 150, and 200 kGy at room temperature by Raman spectroscopy. HRTEM, FESEM, and FTIR tests were performed to investigate changes in the atomic and molecular structures in the material at various doses. Results of the HRTEM, and FESEM tests were in good accordance with the experimental data in justifying the dosimeter behavior. FTIR analysis confirmed the presence of C-C, C-O, C=C, C=O, CH, CH2, and OH functional groups in the samples. The samples were analyzed by Raman spectroscopy to identify defects created in the carbon atoms of the MWCNT. Results showed that the amount of I-D/I-G quantity, as the dosimeter response, versus absorbed dose was linear up to 50 kGy with a standard deviation of 9.8%. Finally, fading analysis was carried out after 4 months, where a significant change in the dosimeter response was observed. Our findings show the benefits of Raman spectroscopy to measure the response of the dosimeter as quickly as possible. Also, it is recommended to study on the fading effect at various time intervals.

Automated summary

This experimental work investigated the dosimetry characteristics of Multi-Walled Carbon Nanotube (MWCNT) using Raman spectroscopy. The study examined the linearity, repeatability, and long-term stability of the dosimeter, and analyzed changes in atomic and molecular structures at various absorbed doses. The results showed that Raman spectroscopy is a quick and effective method for measuring the dosimeter response, and it is recommended to further study the fading effect at different time intervals.