Modification of surface functionality and interlayer spacing of multi-walled carbon nanotubes using γ-rays

The surface functionality and interlayer spacing changes induced by γ-ray irradiation were investigated in multi-walled carbon nanotubes (MWCNTs). The modification effect of MWCNTs irradiated in air and epoxy chloropropane (ECP) was characterized by x-ray photoelectron spectroscopy, Raman spectroscopy, and x-ray diffraction. The results indicated that γ-ray irradiation in two different media improved the amount of oxygen-containing functional groups on nanotube surface, and the irradiation in ECP was more efficient. Compared with the pristine MWCNTs, the MWCNTs irradiated in air exhibited a decrease in width of G band and intensity ratio of D to G band in the Raman spectra and an increase in intensity and diffraction angle of (002) characteristic x-ray peak. However, the MWCNTs tended to show the opposite behaviors in Raman spectra and x-ray diffraction patterns after they were irradiated in ECP. This preliminary study suggests that γ-ray irradiation in air can meaningfully decrease the interlayer distanc...

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