Morphological change of multiwalled carbon nanotubes through high-energy (MeV) ion irradiation
- Department of Physics, Korea University, Seoul 136-713 (Korea, Republic of)
Multiwalled carbon nanotubes (MWCNTs) were expanded by 2.5 times in diameter through high-energy (MeV) ion irradiation. Pristine MWCNTs were synthesized onto SiO{sub 2} substrate by chemical vapor deposition. The 4 MeV Cl{sup 2+} ions with a dose of 3x10{sup 16} ions/cm{sup 2} were irradiated on MWCNTs. From high-resolution transmission electron microscopy (HR-TEM) images, the average diameter of the high-energy-ion-irradiated MWCNTs was {approx}180 nm, while that of the pristine MWCNTs was {approx}70 nm. The wall thickness of the pristine and the high-energy-ion-irradiated MWCNT samples was {approx}20 nm and 40-50 nm, respectively. We observed the clear formation of nanocompartments with bamboolike structure inside the tubes after ion irradiation. The amorphous carbon structure in the ion-irradiated MWCNT shells was observed from Raman spectra. Based on the results of HR-TEM and Raman spectra, the expansion of the systems represents morphological transition from crystalline graphite structure to amorphous carbon or finite sized graphite structure due to the ion impact. We suggest that high-energy ion irradiation can be useful for the modification of MWCNT structures.
- OSTI ID:
- 20665011
- Journal Information:
- Journal of Applied Physics, Vol. 97, Issue 2; Other Information: DOI: 10.1063/1.1834721; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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