Researchers at the University of Waterloo (Canada) have developed an additive-free, water-based graphene ink that opens up new possibilities for applications in electronics, the automotive industry and environmental technology. The ink can be processed using 3D printers and offers sustainable solutions for numerous technical challenges.

Water-based graphene ink can be used to manufacture electronic sensors and lightweight components.Source: University of Waterloo

Graphene is considered a promising material due to its unique electrical and thermal properties. However, its industrial application has been limited by the difficulty of handling the powdery structure. Researchers at the University of Waterloo have solved this problem by developing a water-based, additive-free graphene ink. This novel formulation allows graphene to be formed into complex geometries using 3D printing without the need for chemical solvents. This makes production more environmentally friendly and versatile.

The graphene ink’s high conductivity and formability make it suitable for a range of applications. It can be used in portable sensors for smartwatches or glu cose meters for diabetics. In the automotive industry, it can be used to manufacture lighter vehicle components, which reduces fuel consumption and increases durability. In addition, the ink can be used in environmental technologies, for example for the filtration and desalination of water or for the cleaning of oil spills with super-absorbent structures. Another promising approach is its use in carbon dioxide capture to actively combat climate change.

Water-based graphene ink also opens up new possibilities for organic coatings. It can be used as a conductive layer in functional coatings that are used, for example, in flexible electronics or smart surfaces. In addition, the ink enables the development of sustainable, solvent-free protective coatings for metals and plastics, which means that more environmentally friendly coating processes can be realised.

Efficient mass production through new process

A key aspect of this innovation is the newly developed two-step electrochemical process that enables the production of graphene nanosheets in water. A special intercalation process, in which molecules are inserted into layered graphite, allows for the continuous production of nanoscale graphene particles.

According to Prof. Milad Kamkar, director of the Multiscale Materials Design Lab at the University of Waterloo, this technology could be a breakthrough for sustainable materials development. The new ink combines environmental friendliness with high performance and paves the way for innovative applications in a wide range of industries.

Source: University of Waterloo, 2025