What is graphene? Types, production and uses

Graphene is a sheet one atom thick in which carbon atoms are arranged in a honeycomb lattice. Since its experimental isolation in 2004 it has become one of the most talked-about topics in materials science. For the chemical industry, the real question is no longer "what is graphene" but "in which application, at what quality and at what cost does it actually work."

What is graphene?

Graphene is a single layer of graphite. The sheet that results when the weak bonds between layers are broken exhibits extraordinary properties: very high electrical and thermal conductivity, tensile strength many times that of steel, and near-total impermeability — combined with negligible mass.

However, most products sold in industry under the name "graphene" are not single-layer. In practice, three categories are distinguished:

• Single/few-layer graphene: graphene in the true sense; used in electronics and sensor applications.
• Graphene nanoplatelets (GNP): 5–10 layers; the most common commercial form used as an additive.
• Graphene oxide (GO) and reduced graphene oxide (rGO): carry oxygen-containing groups, dispersible in water; used in membrane and composite applications.

How is it produced?

The commercial equation is clear: quality and scale are inversely proportional. Composite additives require cheap nanoplatelets at ton scale, while electronic applications demand defect-free but expensive CVD film.

Which sectors use it?

• Paints and coatings: improving corrosion resistance through barrier effect, antistatic and heat-spreading coatings. Today the most mature commercial application area.
• Plastics and composites: imparting mechanical strength and conductivity at low additive ratios.
• Energy storage: conductive additive in lithium-ion battery electrodes, supercapacitor electrodes.
• Electronics: flexible displays, transparent electrodes, sensors — most still at the development stage.
• Environmental technologies: water treatment membranes, desalination.
• Thermal management: heat-spreading film in electronic devices.

The Turkish market and production

In Turkey, graphene is a field developing mainly around university laboratories, technopark companies and R&D centers. There are domestic ventures producing nanoplatelets and graphene oxide; the real bottleneck is not production but conversion into application: an additive must be incorporated into an existing formulation, the dispersion problem must be solved, and the cost-benefit balance must be proven.

The sector's agenda includes: standardization (measurably defining what the product sold actually is), dispersion technologies, opportunities in the battery value chain, and nanomaterial regulation along with occupational health assessments. You can find the latest news on these topics below.

Technical properties

The difference between the two columns in this table is the most important fact about the graphene market: laboratory values do not translate directly into commercial products. When evaluating a supplier, one should request not theoretical properties but measured layer count, lateral size distribution, surface area and carbon/oxygen ratio. The D/G band ratio in Raman spectroscopy is also the standard indicator of defect density.

Points to consider when evaluating suppliers

• Request a characterization report. A product for which layer count, lateral size distribution, surface area and carbon/oxygen ratio are not provided cannot be properly evaluated.
• Have independent verification performed. The mismatch between the product label and actual content is a known problem in the sector.
• Request dispersion, not powder. If your application is suited to a ready-made dispersion, most of the agglomeration problem will have already been solved by the supplier.
• Measure the claimed benefit in your own formulation. The effect of the additive strongly depends on the matrix and processing method.
• Do not skip the occupational health assessment. Processing nanomaterials in powder form requires separate protective measures.

Frequently asked questions

Is every "graphene" sold on the market really graphene?

No — this is the sector's best-known problem. Independent reviews have shown that many products sold under the name graphene are in fact finely ground graphite. Buyers should request measured data such as layer count, lateral size and carbon/oxygen ratio, and where possible, have independent analysis carried out.

How much graphene is added to a composite?

Generally between 0.1 and 2 percent by weight. More often provides no benefit: the sheets agglomerate, create defects within the matrix, and mechanical properties decline. The value of graphene lies in its ability to make a significant difference at very low loading ratios.

What is the biggest technical obstacle?

Dispersion. Graphene sheets attract each other strongly and tend to re-stack into bulk form. Graphene that cannot be individually dispersed within a matrix amounts to little more than an expensive filler. This is why most commercial products are sold not as pure powder but as ready-made dispersions or masterbatches.

What is the difference between graphene and carbon nanotubes?

Both are nanostructured carbon. Carbon nanotubes are cylindrical, while graphene is planar. Nanotubes are generally more effective at building conductive networks; graphene stands out in barrier properties and heat dissipation. Depending on the application, the two are sometimes used together.

When will graphene become widespread?

It already is, field by field: anti-corrosion coatings, conductive inks and battery additives are sold commercially. Graphene replacing silicon in electronics, however, is not expected in the near term — mainly because graphene lacks a natural band gap. Expectations need to be calibrated according to the application.