TY - GEN
T1 - Effects of MeV ions on thermal stability of single walled carbon nanotubés
AU - Adhikari, A. R.
AU - Huang, M. B.
AU - Ryu, C. Y.
AU - Ajayan, P. M.
AU - Bakhru, H.
PY - 2006
Y1 - 2006
N2 - The properties of carbon nanotubes (CNTs) are closely dependent on their structures, and therefore may be tailored by controllably introducing defects in the nanotube systems. In this work, we have investigated the effects of energetic ions (H + and He +) on the thermal stability of single wall nanotubes (SWNTs) against oxidation in air. SWNTs were irradiated with MeV ions to various doses in the range 10 13-10 16 cm -2. Thermogravimetric analysis (TGA) was used to determine the loss of CNT masses as a result of oxidation processes. As opposed to the case of pristine SWNTs for which the temperature (T max) corresponding to maximum oxidation rate was found to be ∼ 495°C, ion beam processing significantly enhanced the thermal stability of nanotubes, e.g., Tmax increased by about 30°C after H + implantation (dosage: 10 15 cm -2) and 17 °C after He + implantation (dosage: 10 13 cm-2). The activation energies for thermal oxidation under various conditions were also extracted from TGA data, with values ranging from 1.13 eV (for pristine SWNTs) to 1.37 eV, depending on ion doses and species. Raman spectroscopy was used to determine the characteristics of the G band (C-C stretching mode) and D band (disorder induced mode) in CNTs. The work suggests that the SWNTs modifies to more stable structure (may be cross-linked SWNTs) at small doses. Once the number of defects exceeds some critical value (depending on the type and dosage of bombarding ion) the bonding energy in CNTs weakens, leading to the reduced thermal stability of CNTs against oxidation.
AB - The properties of carbon nanotubes (CNTs) are closely dependent on their structures, and therefore may be tailored by controllably introducing defects in the nanotube systems. In this work, we have investigated the effects of energetic ions (H + and He +) on the thermal stability of single wall nanotubes (SWNTs) against oxidation in air. SWNTs were irradiated with MeV ions to various doses in the range 10 13-10 16 cm -2. Thermogravimetric analysis (TGA) was used to determine the loss of CNT masses as a result of oxidation processes. As opposed to the case of pristine SWNTs for which the temperature (T max) corresponding to maximum oxidation rate was found to be ∼ 495°C, ion beam processing significantly enhanced the thermal stability of nanotubes, e.g., Tmax increased by about 30°C after H + implantation (dosage: 10 15 cm -2) and 17 °C after He + implantation (dosage: 10 13 cm-2). The activation energies for thermal oxidation under various conditions were also extracted from TGA data, with values ranging from 1.13 eV (for pristine SWNTs) to 1.37 eV, depending on ion doses and species. Raman spectroscopy was used to determine the characteristics of the G band (C-C stretching mode) and D band (disorder induced mode) in CNTs. The work suggests that the SWNTs modifies to more stable structure (may be cross-linked SWNTs) at small doses. Once the number of defects exceeds some critical value (depending on the type and dosage of bombarding ion) the bonding energy in CNTs weakens, leading to the reduced thermal stability of CNTs against oxidation.
UR - https://www.scopus.com/pages/publications/33646193918
M3 - Conference contribution
SN - 1558998411
SN - 9781558998414
T3 - Materials Research Society Symposium Proceedings
SP - 27
EP - 32
BT - Materials Research Society Symposium Proceedings
T2 - 2005 Materials Research Society Fall Meeting
Y2 - 28 November 2005 through 1 December 2005
ER -