ฉันรักแปลAn optical pH sensor based on polyaniline is presented in this paper. Polyaniline ®lms were prepared by chemical oxidation at room
temperature. By increasing reaction time for up to 12 h, the stability of the polyaniline ®lm was signi®cantly improved. The ®lm showed
rapid reversible color change upon pH change. Solution pH could be determined by monitoring either absorption at a ®xed wavelength or
the maximum absorption wavelength of the ®lm. The optical pH sensors can be exposed in air for over 1 month without any deterioration in
sensor performance.