KERI develops high-resolution 3D printing technology for MXene microstructures

A research team at the Korea Electrotechnology Research Institute (KERI) led by Dr. Seol Seung-kwon has developed a method for high-resolution additive manufacturing of microstructures using the nanomaterial MXene. The two-dimensional material, which was discovered in the USA in 2011, consists of alternating layers of metal and carbon and is characterized by high electrical conductivity and electromagnetic shielding properties. Due to these properties, MXene is being investigated for applications in high-performance batteries and electronic components. Until now, however, processing the material in 3D printing has posed a challenge, as conventional processes required binders that can impair the material’s properties.

To overcome these limitations, the team developed a printing method based on the so-called meniscus effect. This involves forming a drop of liquid under constant pressure control without it bursting due to capillary forces. By using highly hydrophilic MXene in a water-based nano ink, it was possible to print high-resolution structures without the use of additional binders. During the printing process, the water evaporates quickly on the surface of the meniscus, stabilizing the nanoparticles through van der Waals forces and bonding them into a conductive microstructure.

The print resolution is 1.3 micrometers, which is around 270 times finer than conventional processes. This enables significantly improved performance and miniaturization in electronic components. In applications such as energy storage devices, the increased surface structure can increase the ion transfer rate, which leads to a higher energy density. In the field of electromagnetic shielding, the structuring ensures better absorption and reflection properties. It also opens up new possibilities for sensor applications, as the higher resolution enables improved sensitivity.

Dr. Seol Seung-kwon stated, “We put a lot of effort into optimizing the concentration conditions of MXene ink and precisely analyzing the various parameters that could arise during the printing process.” He further remarked, “Our technology is the world’s first achievement that allows the creation of high-strength, high-precision 3D microstructures by leveraging the advantages of MXene without the need for any additives or post-processing.”