Photonic Crystal Chemical Sensors: pH and Ionic Strength

摘要: Diffraction from a photonic crystal material composed of hydrolyzed polymerized crystalline colloidal array (PCCA) can be used to sense pH and ionic strength. The PCCA is polyacrylamide hydrogel which embeds polystyrene (CCA). diffracted wavelength the changes as volume due alterations in CCA lattice constant. We examine strength dependence by monitoring Bragg wavelength. also develop zero free parameter quantitative model describe volume.