Visible Light 3D Printing of High-Resolution Superelastic Microlattices of Poly(ethylene glycol) Diacrylate/Graphene Oxide Nanocomposites via Continuous Liquid Interface Production

Continuous liquid interface production (CLIP) has been regarded as a revolutionary three-dimensional (3D) printing technology capable of continuously creating complex structures with both high resolution and fast speed. However, it highly relies on the UV light source, which is costly and not applicable for some end uses. Herein, a novel photocurable ink containing biocompatible poly(ethylene glycol) diacrylate (PEGDA) and graphene oxide (GO) was demonstrated in successful CLIP 3D printing with a cheap visible light source. GO not only works as a photoabsorber for significant enhancement of visible light absorbance to realize high-resolution CLIP printing but also reinforces the polymer matrix to achieve high mechanical properties of the final products. Of note, the CLIP-printed microlattices with a microtexture as thin as 100 μm exhibited fantastic superelastic features coupled with outstanding mechanical performance. Remarkably, the microlattice prints with custom geometries could survive from 90% compressive strain, indicating their stunning superelasticity.