pH and Acid type-responsive Self-assembled Colorimetric Film of Block Copolymer Photonic Crystals
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Stimuli-responsive photonic crystals have been explored as optical sensors for detection of chemical and biological analytes. The stop band of these photonic films was increased with decrease in pH value or increase in hydration energy of its conjugated bases. Thus, pH value and acid type of unknown acidic solution contacted with the photonic film can be identified by the naked eye. The stop band was also tunable by using different molecular weight of block copolymer and introducing the cross-linker. The mechanism of response to pH and acid type in photonic films was explained by Henderson-Hasselbalch equation and Hydration energy of conjugated bases. To confirm our hypothesis, the swelling behavior was modeled by using the transfer matrix method (TMM) based on the experimental reflectivity spectra. This work provide useful information for the development of various photonic applications with polymers.