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Thermal stability study of nitrogen functionalities in a graphene network

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

Kumar, A, Ganguly, A and Papakonstantinou, P (2012) Thermal stability study of nitrogen functionalities in a graphene network. Journal of Physics: Condensed Matter , 24 . 235503-6pages. [Journal article]

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URL: http://iopscience.iop.org/0953-8984/24/23/235503

DOI: doi:10.1088/0953-8984/24/23/235503

Abstract

Catalyst-free vertically aligned graphene nanoflakes possessing a large amount of high density edge planes were functionalized using nitrogen species in a low energy N+ ion bombardment process to achieve pyridinic, cyanide and nitrogen substitution in hexagonal graphitic coordinated units. The evolution of the electronic structure of the functionalized graphene nanoflakes over the temperature range 20–800 ◦C was investigated in situ, using high resolution x-ray photoemission spectroscopy. We demonstrate that low energy irradiation is a useful tool for achieving nitrogen doping levels up to 9.6 at.%. Pyridinic configurations are found to be predominant at room temperature, while at 800 ◦C graphitic nitrogen configurations become the dominant ones. The findings have helped to provide anunderstanding of the thermal stability of nitrogen functionalities in graphene, and offerprospects for controllable tuning of nitrogen doping in device applications

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:22272
Deposited By:Professor Pagona Papakonstantinou
Deposited On:15 May 2012 08:48
Last Modified:15 May 2012 08:48

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