Substitutional nitrogen incorporation through rf glow discharge treatment and subsequent oxygen uptake on vertically aligned carbon nanotubes

GA Abbas, P Papakonstantinou, GRS Iyer, IW Kirkman, LC Chen

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Abstract

By employing polarization- and temperature- dependent near- edge x- ray- absorption fine structure (NEXAFS) studies, we show that vertically aligned carbon nanotubes when subjected to low- pressure radio- frequency (rf) glow discharge can easily be doped with nitrogen atoms at predominantly graphitelike substitutional sites and at the same time preserve their vertical alignment in contrast to commonly used wet chemical functionalization methods. The O K edge NEXAFS spectra and angle- dependent x- ray phoelectron spectroscopy measurements established the presence of a significant amount of oxygen containing functional groups localized at the outer part of the walls. The amount of oxygen adsorbed on the carbon nanotubes is dependent on the introduction of nitrogen sites and exposed edge plane defects generated by plasma N treatment. Thermal gravimetric analysis measurements revealed a lower decomposition temperature for the plasma treated carbon nanotubes, which has its origin in the presence of a large fraction of active sites induced by rf glow discharge plasma treatment that accelerates the oxidation rate of N- doped carbon nanotubes. Our results indicate that rf low- pressure glowdischargemediated doping of nanotubes is a promising route to control the electronic structure of nanotubes and their reactivity due to introduction of active site defects.
LanguageEnglish
Pages195429
JournalPhysical Review B: Condensed Matter and Materials Physics
Volume75
Issue number19
DOIs
Publication statusPublished - 21 May 2007

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Carbon Nanotubes
Glow discharges
glow discharges
Carbon nanotubes
radio frequencies
Nitrogen
carbon nanotubes
Oxygen
nitrogen
oxygen
x ray absorption
Plasmas
X rays
Nanotubes
nanotubes
low pressure
fine structure
Defects
Gravimetric analysis
defects

Cite this

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title = "Substitutional nitrogen incorporation through rf glow discharge treatment and subsequent oxygen uptake on vertically aligned carbon nanotubes",
abstract = "By employing polarization- and temperature- dependent near- edge x- ray- absorption fine structure (NEXAFS) studies, we show that vertically aligned carbon nanotubes when subjected to low- pressure radio- frequency (rf) glow discharge can easily be doped with nitrogen atoms at predominantly graphitelike substitutional sites and at the same time preserve their vertical alignment in contrast to commonly used wet chemical functionalization methods. The O K edge NEXAFS spectra and angle- dependent x- ray phoelectron spectroscopy measurements established the presence of a significant amount of oxygen containing functional groups localized at the outer part of the walls. The amount of oxygen adsorbed on the carbon nanotubes is dependent on the introduction of nitrogen sites and exposed edge plane defects generated by plasma N treatment. Thermal gravimetric analysis measurements revealed a lower decomposition temperature for the plasma treated carbon nanotubes, which has its origin in the presence of a large fraction of active sites induced by rf glow discharge plasma treatment that accelerates the oxidation rate of N- doped carbon nanotubes. Our results indicate that rf low- pressure glowdischargemediated doping of nanotubes is a promising route to control the electronic structure of nanotubes and their reactivity due to introduction of active site defects.",
author = "GA Abbas and P Papakonstantinou and GRS Iyer and IW Kirkman and LC Chen",
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TY - JOUR

T1 - Substitutional nitrogen incorporation through rf glow discharge treatment and subsequent oxygen uptake on vertically aligned carbon nanotubes

AU - Abbas, GA

AU - Papakonstantinou, P

AU - Iyer, GRS

AU - Kirkman, IW

AU - Chen, LC

PY - 2007/5/21

Y1 - 2007/5/21

N2 - By employing polarization- and temperature- dependent near- edge x- ray- absorption fine structure (NEXAFS) studies, we show that vertically aligned carbon nanotubes when subjected to low- pressure radio- frequency (rf) glow discharge can easily be doped with nitrogen atoms at predominantly graphitelike substitutional sites and at the same time preserve their vertical alignment in contrast to commonly used wet chemical functionalization methods. The O K edge NEXAFS spectra and angle- dependent x- ray phoelectron spectroscopy measurements established the presence of a significant amount of oxygen containing functional groups localized at the outer part of the walls. The amount of oxygen adsorbed on the carbon nanotubes is dependent on the introduction of nitrogen sites and exposed edge plane defects generated by plasma N treatment. Thermal gravimetric analysis measurements revealed a lower decomposition temperature for the plasma treated carbon nanotubes, which has its origin in the presence of a large fraction of active sites induced by rf glow discharge plasma treatment that accelerates the oxidation rate of N- doped carbon nanotubes. Our results indicate that rf low- pressure glowdischargemediated doping of nanotubes is a promising route to control the electronic structure of nanotubes and their reactivity due to introduction of active site defects.

AB - By employing polarization- and temperature- dependent near- edge x- ray- absorption fine structure (NEXAFS) studies, we show that vertically aligned carbon nanotubes when subjected to low- pressure radio- frequency (rf) glow discharge can easily be doped with nitrogen atoms at predominantly graphitelike substitutional sites and at the same time preserve their vertical alignment in contrast to commonly used wet chemical functionalization methods. The O K edge NEXAFS spectra and angle- dependent x- ray phoelectron spectroscopy measurements established the presence of a significant amount of oxygen containing functional groups localized at the outer part of the walls. The amount of oxygen adsorbed on the carbon nanotubes is dependent on the introduction of nitrogen sites and exposed edge plane defects generated by plasma N treatment. Thermal gravimetric analysis measurements revealed a lower decomposition temperature for the plasma treated carbon nanotubes, which has its origin in the presence of a large fraction of active sites induced by rf glow discharge plasma treatment that accelerates the oxidation rate of N- doped carbon nanotubes. Our results indicate that rf low- pressure glowdischargemediated doping of nanotubes is a promising route to control the electronic structure of nanotubes and their reactivity due to introduction of active site defects.

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M3 - Article

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JO - Physical Review B: Condensed Matter and Materials Physics

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SN - 1098-0121

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