Objective and Method: In this paper, dye is used as pH sensors. We here report
the study of the effect of pH solutions on Methyl red doped polystyrene and Bromocresol
Purple doped Styrene acrylonitrile waveguides. The effect of pH solutions was observed on
the absorption spectra and output intensity of the waveguides.
Conclusion: It was observed that for pH solutions to which the dye is sensitive, output intensity
decreased and it was clearly seen in absorption spectra too. Methyl red doped polystyrene
waveguides showed sensitivity for pH range 5-6 and Bromocresol purple doped Styrene
acrylonitrile waveguides showed sensitivity for pH range 5-9. These dye-doped polymer
waveguides can be used as pH sensors.
Keywords: Polymer, pH sensor, waveguides, UV vis Spectroscopy, LEDs, modulators.
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