Produced from ultra-pure Sri Lankan vein graphite powder from the Ragedara mine. Graphite oxide is the essential intermediate for graphene oxide (GO) and reduced graphene oxide (rGO) production. Starting from 98–99.5% purity feedstock gives a cleaner, more consistent oxidation reaction with fewer metallic contaminants than lower-grade sources.
Graphite oxide (the GO precursor) is produced by oxidising graphite with strong oxidising agents — most commonly via the Hummers method or its variants (H₂SO₄, KMnO₄, H₂O₂). The process introduces oxygen-containing functional groups (hydroxyl, epoxide, carboxyl, carbonyl) between the graphene layers, significantly expanding the interlayer d-spacing from ~3.35 Å to 7–10 Å.
Once oxidised, graphite oxide can be exfoliated in water to produce individual graphene oxide (GO) sheets — single-atom-thick layers with abundant –OH, –COOH and epoxide functional groups that make GO dispersible in water and polar solvents. These GO sheets can then be chemically or thermally reduced to produce reduced graphene oxide (rGO) with partially restored electrical conductivity.
Why feedstock purity matters critically: The Hummers oxidation process introduces KMnO₄ and H₂SO₄ into the reaction. Lower-grade graphite feedstocks carry pre-existing metallic impurities — particularly iron (Fe), manganese (Mn) and aluminium (Al) — that persist through oxidation and contaminate the final GO/rGO product. These contaminants affect electrochemical performance, catalytic activity and reproducibility.
Starting from G-98 to G-99.5 Sri Lankan vein graphite — with natural carbon content of 98–99.5% Cg achieved without acid purification — minimises the metallic impurity burden before oxidation begins, yielding a cleaner, more reproducible graphene oxide product.
High-purity graphite powder is treated with strong oxidising acids (typically H₂SO₄, KMnO₄, H₂O₂ via the Hummers method or modified variants). Oxygen functional groups are intercalated between graphene layers, expanding the d-spacing from ~3.35 Å to 7–10 Å. The reaction yield and product consistency are directly dependent on feedstock purity — fewer pre-existing impurities means a cleaner reaction.
Graphite oxide dispersed in water undergoes ultrasonication or mechanical stirring to exfoliate individual graphene oxide (GO) sheets — single-atom-thick layers with abundant –OH, –COOH and epoxide groups on their surfaces and edges. These functional groups make GO strongly hydrophilic and dispersible in water and polar solvents, enabling applications in membranes, coatings and biomedical research.
Chemical reduction (hydrazine, ascorbic acid, sodium borohydride) or thermal annealing at 200–1000°C removes oxygen functional groups, restoring sp² carbon bonds and recovering electrical conductivity to produce reduced graphene oxide (rGO). The degree of reduction is tunable — partial reduction retains some functional groups for composite integration, while high-temperature reduction maximises conductivity restoration.
Graphene oxide derived from graphite oxide is used in supercapacitor electrodes, Li-ion battery anodes, and next-generation solid-state batteries for improved charge capacity and cycle life.
The primary industrial feedstock for graphene oxide and reduced graphene oxide production — demanded across electronics, coatings, membranes and biomedical research globally.
GO-based barrier coatings improve gas impermeability and corrosion resistance. Used in anti-corrosion primers, packaging films and protective surface treatments for metals and polymers.
Graphene oxide membranes enable precise molecular-level filtration for water purification, desalination and gas separation — among the most promising applications in advanced materials.
rGO from high-quality graphite oxide integrates into polymer matrices to impart electrical conductivity, thermal conductivity, and mechanical reinforcement at low filler loadings.
GO's functionalised surfaces are investigated for drug delivery vehicles, biosensor platforms, and tissue engineering scaffolds — applications that require the highest possible feedstock purity to avoid toxicity issues.