Gyroid-structured nanoporous chitosan from block copolymer template for UVC reflection

Abstract Bioinspired from structural coloration of butterfly wing structure, this work aims to fabricate nanoporous chitosan for UVC reflection. By taking advantage self-assembled polystyrene- b -polydimethylsiloxane (PS- -PDMS) with double gyroid texture followed by hydrofluoric acid etching PDMS block, PS well-defined nanochannels can be fabricated, and used as a template templated crosslinking reaction through multiple pore-filling process. Well-ordered shifting networks in nanoscale successfully fabricated after removal the template. With low absorption ultraviolet region opening bandgap, it is appealing exploit nanonetwork high reflective materials optical devices, evidenced finite-difference time-domain (FDTD) simulation measurements experimentally.