Abstract
In this study, the effects of gamma-ray and neutron radiation on multi-walled carbon nanotubes (MWCNTs) at different doses were investigated. The samples in powder form were exposed to thermal neutrons, fast neutrons, and 10 kGy and 20 kGy doses of gamma-ray radiation. Virgin and irradiated MWCNTs were investigated through structural, optical, morphological, and chemical analysis by Raman spectroscopy, x-ray diffraction (XRD), x-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and scanning electron microscopy (SEM) to investigate the damage produced by the radiation. The Raman spectroscopy measurements show that the ID/IG ratio increased with the irradiation except for the 10 kGy gamma rays. XPS measurements display a higher degree of oxygen incorporation with the neutron irradiation. Detailed analysis of the C1s spectra also shows lower percentages of CC sp2 and higher percentages of CC sp3 in the MWCNTs irradiated by neutrons. Dark black spots were observed in the MWCNTs by irradiation, which is attributed to the formation of an amorphous structure by TEM measurements. The results show that, overall, the 10 kGy gamma irradiation dose improves the structural quality while the 20 kGy dose gamma rays, fast, and thermal neutrons caused a decrease in the degree of the structural quality of the MWCNTs.
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