Multi-material 3D Microprinting in Resin Droplets Using Two-photon Polymerization

Polyethylene glycol diacrylate (PEGDA) is a photosensitive polymer offering self-healing capabilities through chemical or structural modifications, making it suitable for enhancing the reliability of micro/nano robotics. This study introduces a 3D microdroplet printing approach using direct laser writing (DLW) via two-photon polymerization with a femtosecond laser. Adding DI water can reduce the viscosity of PEGDA, and the nL droplets with T-junction can be created. On the basis, some kinds of metal powder can be added into PEGDA to make composite resin droplets. And I can also do 3D printing by using the different composite resin to create a multilayer structure of hundreds of microns. This work demonstrates a novel method for precise microdroplet-based 3D fabrication, advancing micro/nano manufacturing technologies.