Carbon nanotubes have unique characteristics:
100 times Stronger than steel
1000°С Thermal stability
1 million times The highest length to diameter ratio
5 times lighter than copper One of the best conductors in the world
2 basketball courts Surface area of 1g

Due to their properties, carbon nanotubes are genuinely the first universal additive that can be used to improve the performance of materials in various industries: Electrochemical power sources: lithium-ion batteries , Elastomers: tires and other rubber material , Polymer nanocomposite materials , Transparent conductive films .

Transparent conductive films

Transparent conductive films (TCFs) are used as transparent electrodes in the manufacturing of touch screens, LCDs, cover electrodes for solar cells and organic light-emitting diodes.

TCFs consist of a transparent polymer-based substrate (50–150 μm thick) on which a thin layer of conductive material is applied (less than 100 nm thick). Conductive layers usually employ metal oxides (InO2:Sn, SnO2:F), silver nanofibers, metal meshes (copper, silver, gold), graphene, conductive polymers (PEDOT: PSS), or carbon nanotubes.

Key properties

Surface resistance (Rs) and transmittance (T) are the most important parameters for TCFs. The easiest way to reduce resistance is to increase the conductive layer thickness, which leads to transmittance losses. Therefore, the balance between the resistance and the transmittance of the transparent conductive film is sought for in most of the applications.

Important additional properties of TCFs are the presence or absence of optical interference (haze), the resistance to mechanical stresses, as well as the transparency in near-IR spectrum.

OCSiAl is developing a technology to create TCFs with a conductive layer based on graphene tubes. The usage of TUBALL as the material of the conductive layer has provided the ultimate improvement of the quality of the conductive films.

Transparent conductive films powered by TUBALL

We have produced TCFs samples of 110 ohm/sq surface resistance with about 90% transparency. The decisive advantage of our TCFs is the high-yield technology of conductive layer application, low cost, and excellent mechanical resistance. Taking into consideration the absence of optical defects of films and their stable transparency to both visible and near infrared spectrum typical for graphene tubes, OCSiAl TCF serves as an excellent all-purpose transparent electrode.


TCF with TUBALL. SEM image. OCSiAl, 2014.

Now we are developing a liquid conductive coating TUBALL INK, suitable for the production of transparent electrodes using various equipment.

TUBALL-based transparent conductive films have a number of key advantages:

  • Suitability for mass production. Production at room temperature, without using vacuum deposition, with a negligible loss during the application of the conductive layer;
  • Ability to structure the application of the conductive layer using the TUBALL INK solution;
  • Excellent adhesion of the conductive coating to most types of substrates;
  • Resistance of the film parameters to mechanical effects and bending.

Application of Transparent Conductive Films


Surface resistance, Ohm/Sq at 90% Т

Resistive touchscreen 300 - 600
Capacitive touchscreen 100 - 300

Flexible LCDs

50 - 100
Flexible solar cells 5 - 10

Large flexible displays

0,1 - 5


Cost TCF, $/m²
ITO 30
Ag NW 60
Graphene monolayer 120

The first commercially available films with graphene nanotubes appeared in 2014. OCSiAl is ready for commercial production of TCFs for touch screens.

Transparent heater: OCSiAl created a transparent heating film with a heating power of up to 2Kw/sq.m.

The transparent electrodes market forecast

Stable market growth is forecasted until 2019, reaching the $5 billion mark. By the year 2018, the CNT films’ share will account for a quarter of the entire market and will amount to $1.4 billion.

Transparent heater with TUBALL in OCSiAl domestic exposition.

To get more information regarding TUBALL INK, please contact OCSiAl managing director Aleksei Minakov minakov.as@ocsial.com

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