Stabilizing single-walled carbon nanotubes by removal of residual metal catalysts

Roman Brukh; Ornthida Sae-Khow; Somenath Mitra

doi:10.1016/j.cplett.2008.05.026

Stabilizing single-walled carbon nanotubes by removal of residual metal catalysts

Roman Brukh, Ornthida Sae-Khow, Somenath Mitra

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36 Scopus citations

Abstract

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.

Original language	English (US)
Pages (from-to)	149-152
Number of pages	4
Journal	Chemical Physics Letters
Volume	459
Issue number	1-6
DOIs	https://doi.org/10.1016/j.cplett.2008.05.026
State	Published - Jun 27 2008

All Science Journal Classification (ASJC) codes

General Physics and Astronomy
Physical and Theoretical Chemistry

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10.1016/j.cplett.2008.05.026

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title = "Stabilizing single-walled carbon nanotubes by removal of residual metal catalysts",

abstract = "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.",

author = "Roman Brukh and Ornthida Sae-Khow and Somenath Mitra",

note = "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.",

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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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Stabilizing single-walled carbon nanotubes by removal of residual metal catalysts

Abstract

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