Photogated Coordination Switching of Silver Nanoparticles for Reversible Coloration/Discoloration of Hydrogel

Hydrogels remain challenging for the reversible high‐resolution coloration/discoloration in response to external stimuli. Herein, a photogated coordination‐switching mechanism is proposed to alter the localized surface plasmon resonance of silver nanoparticles (AgNPs) inside a hydrogel network, which enables the reversible color change. The hydrogel is synthesized by free‐radical crosslinking of N,N' ‐bisacrylylcystamine (BACA), sodium p...