Two‐Photon Printing of Shape‐Memory Microstructures and Metasurfaces via Radical‐Mediated Thiol‐Vinyl Hydrothiolation

• DOI: 10.1002/admt.202101725
• Publication Date: 2022-03-31T03:10:31Z
• Authors: Madelyn P. Jeske; Wenshi Zhang; Mitchell Anthamatten
• Keywords: Microscale chemistry; Smart material

Abstract Shape‐memory resists capable of high‐resolution curing into arbitrarily designed structures are increasingly demanded for soft robotics, optical sensors, microscale manufacturing, and biomedicine. Amorphous, shape‐memory thiol‐vinyl networks printed using two‐photon polymerization (2PP) a simple resin formulated with commercially available reagents. The ability to print feature sizes down 200 nm is attributed the use radical‐mediated, step‐growth that quickly cross‐links resin, limiting diffusive transport. thermomechanical behavior 2PP‐cured material analyzed in compression, tension, three‐point bending similar UV‐polymerized samples. To demonstrate design, field, test 4D responsive microstructures, an array nine springs coil diameters 330 µm printed. Following compressive shape‐fixing, arrays can release 11 µJ stored elastic strain energy when reheated. Further, new concept dichroic‐memory metamaterial device demonstrated by printing twisted woodpile structure circular dichroism as characterized Mueller Matrix ellipsometry. results this study how combining 2PP stimuli‐responsive molecular architectures further engineering microstructures metamaterials.