Dynamic Polydiacetylene Organogel Microstructure Fabrication Using Photolithography Technique

Abstract

Polydiacetylenes (PDAs) are efficient sensing material due to their unique optical properties in that they exhibit visible color transition from blue to red and fluorescence emission at red upon external stimuli. Many researchers have developed PDAs-based sensors exhibiting dual signaling. Especially, PDAs-based sensors showing reversible color transition have been prepared in many different forms such as monolayers, films, and colloidal liposomes. However, development of PDAs-based sensor exhibiting reversible fluorescence transition still remains a challenge. Here, we developed novel PDA organogel microstructures using Flow lithography. Fabricated PDA microstructure displayed reversible volumetric/fluorescent transition via solvent exchange. Furthermore, we developed interference pattern on-off system based on patterned PDA microstructure using halftone mask. This dynamic PDA organogel microstructure have great potential for devlopment of multi-level security (MLS) system.