Preparation and application of highly sensitive biomimetic photonic crystal thin films based on PEGPEA
Monodisperse polystyrene(PS)@SiO2 core-shell nanometer microspheres were prepared by emulsion polymerization with an improved Stӧber method,dispersed in poly(ethylene glycol)phenyl ether acrylate(PEGPEA)to form a non-dense particle array.A mechanical discolored photonic crystal film was then synthesized from rapid photopolymerization trapping regular array,and characterized by SEM and optical fiber-coupled spectrometer.The influence of volume fraction and particle size of PS@SiO2 core-shell nanometer microspheres on the structure color of photonic crystal thin film were investigated,while the mechanism was further speculated.The results showed that the heat treatment changed the microstructure order of PS@SiO2 core-shell nanometer microspheres,which accelerated the formation of opal photonic crystal structure.The structure color of photonic crystals gradually changed from red to blue with the increase of PS@SiO2 core-shell nanometer microspheres volume fraction or the decrease of particle diameter.The photonic crystal thin film exhibited structural color reflectivity>60%,tensile strain at least up to 70%,sensitivity 2.16 nm/%,response speed 1.9 nm/ms,reflection wavelength tuning range 151 nm.After 100 stretch/release cycles and 3 d recovery at 25℃,the structure color of the photonic crystal film remained unchanged.
万方数据
维普
