Ultra-black automotive coating developed using carbon black pigment and carbon nanotubes

Ultra-Black Coating Absorbs 99.90% of Light, Designed for Automotive Use

Researchers have developed an ultra-black coating that absorbs an average of 99.90% of visible light wavelengths, combining carbon black pigment with carbon nanotubes in a formulation that meets automotive standards for long-term stability.

The development builds on industry interest sparked in 2019 by a BMW concept car featuring a vertically aligned carbon nanotube (VACNT) array coating.

Zhiwei Liu, a research chemist at Nipsea Group, noted that deep black finishes are a premium choice for luxury cars. The coating incorporates structural absorption to enhance light absorption efficiency beyond that of carbon black dispersions alone.

Liu explained that increasing the proportion of carbon nanotubes could further improve light absorption, but this may reduce industrial processability. Future development may involve multi-layer coatings with gradient refractive index to reduce interface reflection.

The researchers have completed technical proof-of-concept for the manufacturing process. Further efforts will focus on verifying coating application parameters and comprehensive film performance validations.