Exploring the fundamental effects of deposition time on the microstructure of graphene nanoflakes by Raman scattering and X-ray diffraction

Soin, Navneet ORCID: 0000-0002-0196-2071, Roy, Susanta Sinha, O'Kane, Christopher, McLaughlin, James AD, Lim, Teck H and Hetherington, Crispin JD (2011) Exploring the fundamental effects of deposition time on the microstructure of graphene nanoflakes by Raman scattering and X-ray diffraction. CrystEngComm, 13 (1). pp. 312-318. ISSN 1466-8033

[img]
Preview
Text
Soin N Exploring the fundamental effects of deposition time on the microstructure of graphene nanoflakes.pdf - Accepted Version

Download (341kB) | Preview
Official URL: http://pubs.rsc.org/en/journals/journalissues/ce#!...

Abstract

A systematic study is reported of the growth of vertically aligned few layered graphene (FLG) nanoflakes on Si (100) substrates by microwave plasma enhanced chemical vapour deposition (MPECVD) method. Asymmetric grazing incident angle X-ray diffraction (GIAXRD) studies revealed a structural transformation, from nanocrystalline graphite layers to FLG, with the increase of growth time. As the growth time increased we observed a preferred vertical orientation of FLGs accompanied by a sharp decrease in the d(002) spacing. Transmission electron microscopy shows these structures have highly graphitized edge planes which terminate in a few layers (1-3) of graphene sheets. Detailed Raman studies not only support the structural transformation but also confirm that the process occurs via the sudden release of stress in nanocrystalline turbostratic graphite films. Graphical plot of all major Raman parameters (such as G peak position, I(D)/I(G) value, FWHM of D, G, and G' peaks) vs. growth time shows a well defined trend. Using the graphical plots a tentative trajectory of the Raman parameters is proposed, which can be very useful in understanding structural transformation during growth process. Finally, a possible growth mechanism of FLGs is presented.

Item Type: Article
Subjects: Q Science > Q Science (General)
Q Science > QC Physics
Divisions: University of Bolton Research Centres > Institute for Materials Research and Innovation
University of Bolton Research Centres > Institute for Materials Research and Innovation
Depositing User: Dr Navneet Soin
Date Deposited: 28 Mar 2018 14:28
Last Modified: 28 Mar 2018 14:28
Identification Number: 10.1039/c0ce00285b
URI: http://ubir.bolton.ac.uk/id/eprint/1484

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year

View more statistics

>