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A planar optical waveguide (OWG) sensor is fabricated by coating a thionine dye–polyvinyl alcohol (PVA) film over a single-mode potassium ion (K+) exchanged glass OWG. In the presence of H2S gas, the color of the thionine–PVA film changed from violet to colorless; this resulted in a decrease in the evanescent absorbance of the film. This sensor exhibits a good linear response to hydrogen sulfide gas in the range of 100 ppb–40 ppm (R = 0.99667) with a rapid response (<2 s) and good reversibility. The present sensor is also characterized by low cost, simple structure, and easy fabrication.
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