Thomas Swan is a world leader in the supply of Single Wall Carbon Nanotubes (SWNTs). We have a well-established manufacturing and supply capability in carbon nanomaterials which is underpinned by our position as an independent, international, performance and fine chemicals supplier.
Raman spectra (532nm excitation wavelength) of Elicarb® Graphene Powder shows a high quality sp2 carbon network with D/G ratio of 0.28 and D/D’ of 5.0. Analysis of D/G ratio against flake size (inset) confirms that D-band is associated with plate edge effects rather than in-plane defects. The low D/D’ ratio is also consistent with edge effects only. The 2D band shape indicates the presence of few-layer graphene flakes with an average of 5-7 atomic layers.
TEM image of Elicarb® Graphene Powder (displayed on carbon grid) shows good quality GNPs of varying layer thicknesses.
Number average platelet size of Elicarb® Graphene Powder by TEM image analysis shows an average X-Y platelet dimension of 1000nm. TEM analysis of multiple batches reveals excellent particle size repeatability from the exfoliation and extraction process.
Sheet Resistance (4 point probe):
A test film is prepared by vacuum filtration of water dispersion of graphene to produce a ca 25 micron thick film. The film is not washed with further solvent after filtration. The sheet resistance is measured with the 4-point probe using on average 10mA current, the thickness of the film is measured to give a sheet resistance normalised to 25 micron.
Typical Sheet Resistance is 10 (± 5) Ω/□ for a 25µm film.
Thermogravimetric Analysis (in air):
TGA to 1100°C in air of Elicarb® Graphene Powder shows a weight loss of ca.4 % at 350°C which is decomposition of surfactant residues followed by the primary decomposition of graphene at 803°C. The manufacturing process can be tuned to reduce or eliminate surfactant residues. A final residue of ca. 4%w/w remains at 1100°C which is due to inorganic residues within the graphite raw material.
Platelet Thickness by Atomic Force Microscopy:
AFM analysis of mean thickness in NMP exfoliated GNPs shows an average plate thickness between 5 and 7 carbon layers.
Elicarb® Graphene products are high quality graphene nanoplatelets with consistent particle size and high conductivity.
Elicarb® Graphene is provided in two product formats:
- Elicarb® Graphene powder:
- Elicarb® Graphene Dispersion (AQ):
A water/surfactant dispersed GNP at a concentration of 1g/litre.
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