TY - JOUR
T1 - Stabilizing single-walled carbon nanotubes by removal of residual metal catalysts
AU - Brukh, Roman
AU - Sae-Khow, Ornthida
AU - Mitra, Somenath
N1 - Funding Information:
Authors are greatly thankful to Dr. Edward Bonder, who helped us obtain the TEM images for this research. US army and US EPA are acknowledged for partial funding of this research.
Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2008/6/27
Y1 - 2008/6/27
N2 - We demonstrate that the removal of residual metals can dramatically enhance the stability of single wall carbon nanotubes (SWCNTs). Metal catalysts are used in SWCNTs synthesis, and residual metals remain in the nanotube preparations. Here we studied the gas phase oxidation of SWCNTs and their metal-free counterpart at high temperatures. After metal removal, the activation energy for oxidation increased by 50% and the frequency factor by nearly four orders of magnitude. This increase in thermal stability was also supported by the fact that the temperature corresponding to the onset of oxidation for metal-free SWCNTs was 135 °C higher than the one containing residual metals.
AB - We demonstrate that the removal of residual metals can dramatically enhance the stability of single wall carbon nanotubes (SWCNTs). Metal catalysts are used in SWCNTs synthesis, and residual metals remain in the nanotube preparations. Here we studied the gas phase oxidation of SWCNTs and their metal-free counterpart at high temperatures. After metal removal, the activation energy for oxidation increased by 50% and the frequency factor by nearly four orders of magnitude. This increase in thermal stability was also supported by the fact that the temperature corresponding to the onset of oxidation for metal-free SWCNTs was 135 °C higher than the one containing residual metals.
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U2 - 10.1016/j.cplett.2008.05.026
DO - 10.1016/j.cplett.2008.05.026
M3 - Article
AN - SCOPUS:45449089086
SN - 0009-2614
VL - 459
SP - 149
EP - 152
JO - Chemical Physics Letters
JF - Chemical Physics Letters
IS - 1-6
ER -