Technology

Technology Overview

Infra+fiber’s core innovation is a proprietary method for the continuous production of ultra-long carbon nanotubes (CNTs). 
CNTs are synthesized as aligned bundles and collected in spools containing up to 15 km of material.  
These nanotubes stand out for their exceptional length, double-walled structure, and hydrophilic surface, enabling better compatibility with polymers, resins, and aqueous media. 
The unique combination of structure and format opens the way for next-generation composites, fibers, and conductive materials.

Structure & Morphology

Infra+fiber nanotubes are primarily double-walled and form flexible, fibrous structures that enable macro-scale processing.
Individual tubes often exceed 100 μm in length, and in specific visualizations, lengths of up to 8 cm have been observed. 
EPFL (2024) confirmed the double-walled structure and measured Fe content at ~0.27 at.% in CNT paper and ~2.5 at.% in spool material.
Recent internal protocols show potential for reducing metallic residues to near detection thresholds (~0.1 at.%).

Double-walled CNT structure confirmed by TEM (on the left ) and Fibrous CNT bundles visible in SEM (on the right).

Product Formats

Infra+fiber CNTs are available in several integration-ready formats:

• Paper sheets (~50 μm thick), made from CNT dispersions
• Spools with aligned CNT bundles, up to 15 km
• Inks and dispersions (0.1–2.0 wt%) in water, ethanol, acetone, or NMP

Application Areas

Infra+fiber CNTs have been explored in the following application areas:

• Freestanding CNT electrodes – binder-free, for energy storage
• CNT-doped cathodes – for LFP and other Li-ion battery chemistries
• Thermal interfaces – CNT-enhanced materials for efficient heat transfer
• CNT inks & coatings – for printed electronics and surfaces
• Low-viscosity CNT resins – for polymer composites
• Field emitters – compact X-ray, sensors, and nanoelectronics

Competitive Comparison

Infra+fiber stands out for producing double-walled CNTs with significantly greater length — enabling integration in applications not feasible with traditional CNTs.