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Change of Structural Behaviors of Organo-Silane Exposed Graphene Nanoflakes

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

Pao, CW, Ray, SC, Tsai, HM, Chen , HC, Lin , IN, Pong, WF, Chiou, JW, Tsai, MH, Shang, NG, Papakonstantinou , P and GuO, GH (2010) Change of Structural Behaviors of Organo-Silane Exposed Graphene Nanoflakes. The Journal of Physical Chemistry C, 114 . pp. 8161-8166. [Journal article]

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URL: http://pubs.acs.org/doi/full/10.1021/jp9121563

DOI: 10.1021/jp9121563

Abstract

The electronic structures of graphene nanoflakes (GNFs) exposed to an organo-silane precursor [tetramethylsilane, TMS, Si(CH3)4] were studied using electron field emission (EFE), Raman spectroscopy, X-ray absorption near-edge structure (XANES), X-ray photoelectron spectroscopy (XPS), X-ray emission spectroscopy (XES), and first-principles calculation. The results of XANES, XPS, and Raman spectroscopy indicate that the silyl radical strong covalent bonds were formed in GNFs, which induced local structural relaxations and enhanced sp3 hybridization. Comparison of calculated electronic structure, XANES, and XES spectra of Si-treated GNFs suggests that the Si atom substitutes one 3-fold coordinated C atom in a given graphene layer and relaxes outward to form sp3 bonding with another C atom in the adjacent graphene layer. The EFE measurements show an increase in the turn-on electric field with the increase of the Si content, which suggests an enhancement of the nonmetallic sp3 bonding.

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:13699
Deposited By:Professor Pagona Papakonstantinou
Deposited On:20 May 2010 10:59
Last Modified:18 Aug 2011 11:57

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