Raman study of the substrate influence on graphene synthesis using a solid carbon source via rapid thermal annealing

Abstract

We report the results of a comparative investigation of graphene films prepared on Si(100) and fused silica (SiO2) combining pulsed laser deposition and rapid thermal annealing using Ni catalyst. The effect of modifying the substrate and/or growth temperature (600–1,000°C) of graphene synthesis was investigated by Raman microspectroscopy mapping. Graphene grown on Si(100) was multilayered, and various nickel silicide phases had formed underneath, revealing dependence on the growth temperature. Films prepared on SiO2 mainly comprised bilayered and trilayered graphene, with no traces of nickel silicide. Analysis of Raman D, G, and 2D peak intensities and positions showed that modifying the growth temperature had different effects when a Si(100) or a SiO2 substrate is used. These findings advance our understanding of how different combinations of substrate and thermal processing parameters affect graphene synthesis from solid carbon source using nickel as a catalyst. This knowledge will enable better control of the properties of graphene film (defects, number of layers, etc.) and will have a high potential impact on the design of graphene‐based devices for scientific or industrial applications.

Electrically conductive silicon oxycarbide thin films prepared from preceramic polymers

“…This finding clearly indicates that the C-rich and O-depleted precipitates in the prepared SiOC-based thin films possess a significantly higher degree of graphitization than that of the matrix. Additionally, the I 2D /I G ratio of the C17-1400 sample was calculated to gain an idea of the number of graphene layers present in sample 54,72,73 . In the work of Bleu et al, a summary of I 2D /I G ratio values was presented, in order to correlate the number of graphene layers in carbon-based samples 72 .…”

“…Additionally, the I 2D /I G ratio of the C17-1400 sample was calculated to gain an idea of the number of graphene layers present in sample 54,72,73 . In the work of Bleu et al, a summary of I 2D /I G ratio values was presented, in order to correlate the number of graphene layers in carbon-based samples 72 . The value obtained in this study which is equal to 0.144 fell under the multilayered graphene with at least 5-10 layers.…”

Graphene-based hybrid electrical-electrochemical point-of-care device for serologic COVID-19 diagnosis

“…I D / I G ratio is usually interpreted as an indicative of sp 2 integrity along the monolayer graphene sheet, for which a value equal to 0 refers to an ideal non-defective graphene( Liu et al, 2013 ). For our monolayer graphene, a I D / I G ratio of 0.35 was obtained and found adequate for considering its features as of a low-defective graphene, taking into account the inevitable defects formation during wet transfer steps( Bleu et al, 2019 ). Moreover, I 2D / I G ratio is used to obtain insights on the number of layers for graphene-based materials with acceptable accuracy( Bleu et al, 2019 ).…”

“…For our monolayer graphene, a I D / I G ratio of 0.35 was obtained and found adequate for considering its features as of a low-defective graphene, taking into account the inevitable defects formation during wet transfer steps( Bleu et al, 2019 ). Moreover, I 2D / I G ratio is used to obtain insights on the number of layers for graphene-based materials with acceptable accuracy( Bleu et al, 2019 ). I 2D / I G ratios equal to 2 are obtained for ideal non-defective monolayer graphene.…”

Recent advances in linear and nonlinear Raman spectroscopy. Part XIV

“…Their observation of strain in as‐grown graphene opens the possibility of tailoring the electronic density of states via strain engineering directly during graphene growth. Bleu et al [ 83 ] carried out a Raman study of the influence of substrate on graphene synthesis using a solid carbon source via rapid thermal annealing. Their findings advance the understanding of how different combinations of substrate and thermal processing parameters affect graphene synthesis from solid carbon source using nickel as a catalyst.…”