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

Biomedical Sciences Research Institute Computer Science Research Institute Environmental Sciences Research Institute Nanotechnology & Advanced Materials Research Institute

Roy, SS, Papakonstantinou, P, Okpalugo, TIT and Murphy, H (2006) Temperature dependent evolution of the local electronic structure of atmospheric plasma treated carbon nanotubes: Near edge x-ray absorption fine structure study. JOURNAL OF APPLIED PHYSICS, 100 (5). 053703. [Journal article]

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DOI: 10.1063/1.2260821

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.

Item Type:Journal article
Faculties and Schools:Faculty of Computing & Engineering
Faculty of Computing & Engineering > School of Engineering
Research Institutes and Groups:Engineering Research Institute
Engineering Research Institute > Nanotechnology & Integrated BioEngineering Centre (NIBEC)
ID Code:6401
Deposited By:Professor Pagona Papakonstantinou
Deposited On:13 Jan 2010 10:55
Last Modified:18 Aug 2011 11:57

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