Temperature dependent evolution of the local electronic structure of atmospheric plasma treated carbon nanotubes: Near edge x-ray absorption fine structure study

SS Roy, P Papakonstantinou, TIT Okpalugo, H Murphy

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Abstract

Near edge x-ray absorption fine structure (NEXAFS) spectroscopy has been employed to obtain the temperature dependent evolution of the electronic structure of acid treated carbon nanotubes, which were further modified by dielectric barrier discharge plasma processing in an ammonia atmosphere. The NEXAFS studies were performed from room temperature up to 900 degrees C. The presence of oxygen and nitrogen containing functional groups was observed in C K edge, N K edge, and O K edge NEXAFS spectra of the multiwalled carbon nanotubes. The N K edge spectra revealed three types of pi(*) features, the source of which was decisively identified by their temperature dependent evolution. It was established that these features are attributed to pyridinelike, NO, and graphitelike structures, respectively. The O K edge indicated that both carbonyl (C = O), pi(*)(CO), and ether C-O-C, sigma(*)(CO), functionalities were present. Upon heating in a vacuum to 900 degrees C the pi(*)(CO) resonances disappeared while the sigma(*)(CO) resonances were still present confirming their higher thermal stability. Heating did not produce a significant change in the pi(*) feature of the C K edge spectrum indicating that the tabular structure of the nanotubes is essentially preserved following the thermal decomposition of the functional groups on the nanotube surface. (c) 2006 American Institute of Physics.
LanguageEnglish
Pages053703
JournalJournal of Applied Physics
Volume100
Issue number5
DOIs
Publication statusPublished - 6 Sep 2006

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x ray absorption
fine structure
carbon nanotubes
electronic structure
temperature
nanotubes
heating
plasma jets
thermal decomposition
ammonia
ethers
thermal stability
nitrogen
atmospheres
vacuum
acids
physics
room temperature
oxygen
spectroscopy

Cite this

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title = "Temperature dependent evolution of the local electronic structure of atmospheric plasma treated carbon nanotubes: Near edge x-ray absorption fine structure study",
abstract = "Near edge x-ray absorption fine structure (NEXAFS) spectroscopy has been employed to obtain the temperature dependent evolution of the electronic structure of acid treated carbon nanotubes, which were further modified by dielectric barrier discharge plasma processing in an ammonia atmosphere. The NEXAFS studies were performed from room temperature up to 900 degrees C. The presence of oxygen and nitrogen containing functional groups was observed in C K edge, N K edge, and O K edge NEXAFS spectra of the multiwalled carbon nanotubes. The N K edge spectra revealed three types of pi(*) features, the source of which was decisively identified by their temperature dependent evolution. It was established that these features are attributed to pyridinelike, NO, and graphitelike structures, respectively. The O K edge indicated that both carbonyl (C = O), pi(*)(CO), and ether C-O-C, sigma(*)(CO), functionalities were present. Upon heating in a vacuum to 900 degrees C the pi(*)(CO) resonances disappeared while the sigma(*)(CO) resonances were still present confirming their higher thermal stability. Heating did not produce a significant change in the pi(*) feature of the C K edge spectrum indicating that the tabular structure of the nanotubes is essentially preserved following the thermal decomposition of the functional groups on the nanotube surface. (c) 2006 American Institute of Physics.",
author = "SS Roy and P Papakonstantinou and TIT Okpalugo and H Murphy",
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TY - JOUR

T1 - Temperature dependent evolution of the local electronic structure of atmospheric plasma treated carbon nanotubes: Near edge x-ray absorption fine structure study

AU - Roy, SS

AU - Papakonstantinou, P

AU - Okpalugo, TIT

AU - Murphy, H

PY - 2006/9/6

Y1 - 2006/9/6

N2 - Near edge x-ray absorption fine structure (NEXAFS) spectroscopy has been employed to obtain the temperature dependent evolution of the electronic structure of acid treated carbon nanotubes, which were further modified by dielectric barrier discharge plasma processing in an ammonia atmosphere. The NEXAFS studies were performed from room temperature up to 900 degrees C. The presence of oxygen and nitrogen containing functional groups was observed in C K edge, N K edge, and O K edge NEXAFS spectra of the multiwalled carbon nanotubes. The N K edge spectra revealed three types of pi(*) features, the source of which was decisively identified by their temperature dependent evolution. It was established that these features are attributed to pyridinelike, NO, and graphitelike structures, respectively. The O K edge indicated that both carbonyl (C = O), pi(*)(CO), and ether C-O-C, sigma(*)(CO), functionalities were present. Upon heating in a vacuum to 900 degrees C the pi(*)(CO) resonances disappeared while the sigma(*)(CO) resonances were still present confirming their higher thermal stability. Heating did not produce a significant change in the pi(*) feature of the C K edge spectrum indicating that the tabular structure of the nanotubes is essentially preserved following the thermal decomposition of the functional groups on the nanotube surface. (c) 2006 American Institute of Physics.

AB - Near edge x-ray absorption fine structure (NEXAFS) spectroscopy has been employed to obtain the temperature dependent evolution of the electronic structure of acid treated carbon nanotubes, which were further modified by dielectric barrier discharge plasma processing in an ammonia atmosphere. The NEXAFS studies were performed from room temperature up to 900 degrees C. The presence of oxygen and nitrogen containing functional groups was observed in C K edge, N K edge, and O K edge NEXAFS spectra of the multiwalled carbon nanotubes. The N K edge spectra revealed three types of pi(*) features, the source of which was decisively identified by their temperature dependent evolution. It was established that these features are attributed to pyridinelike, NO, and graphitelike structures, respectively. The O K edge indicated that both carbonyl (C = O), pi(*)(CO), and ether C-O-C, sigma(*)(CO), functionalities were present. Upon heating in a vacuum to 900 degrees C the pi(*)(CO) resonances disappeared while the sigma(*)(CO) resonances were still present confirming their higher thermal stability. Heating did not produce a significant change in the pi(*) feature of the C K edge spectrum indicating that the tabular structure of the nanotubes is essentially preserved following the thermal decomposition of the functional groups on the nanotube surface. (c) 2006 American Institute of Physics.

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JO - Journal of Applied Physics

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