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Effects of MeV Ions on Thermal Stability of Single Walled Carbon Nanotubes

Published online by Cambridge University Press:  26 February 2011

Ananta Raj Adhikari ,
Mengbing Huang ,
Chang Ryu ,
Pullickel Ajayan  and
Hassaram Bakhru
Ananta Raj Adhikari
Affiliation:
aa8381@albany.edu, State University of New York at Albany, College of Nanoscale Science and Engineering, 251 Fuller Road, Albany, NY, 12203, United States, 518-322-5372
Mengbing Huang
Affiliation:
mhuang@uamail.albany.edu, United States
Chang Ryu
Affiliation:
ryuc@rpi.edu, United States
Pullickel Ajayan
Affiliation:
ajayan@rpi.edu, United States
Hassaram Bakhru
Affiliation:
HBakhru@uamail.albany.edu, United States
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Abstract

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 1013-1016 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 (Tmax) 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: 1015 cm−2) and 17 °C after He+ implantation (dosage: 1013 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.

Keywords

ion-implantationthermogravimetric analysis (TGA)oxidation
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 887: Symposium Q – Degradation Processes in Nanostructured Materials , 2005 , 0887-Q02-03
Copyright
Copyright © Materials Research Society 2006

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