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Citation: Abdukader Abdukayum, Abliz Yimit. Detection of H₂S Gas by Optical Waveguide Sensor Based on Thionine Doped Polyvinyl Alcohol Film[J]. Chinese Journal of Applied Chemistry, ;2010, 27(8): 960-964. doi: 10.3724/SP.J.1095.2010.90622 shu

Detection of H₂S Gas by Optical Waveguide Sensor Based on Thionine Doped Polyvinyl Alcohol Film

Abdukader Abdukayum ^a,b, ,
Abliz Yimit ^b

a. Department of Life and Environmental Sciences, Kashgar Teachers College, Kashgar 844007;
b. College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046

Received Date: 15 September 2009
Revised Date: 29 December 2009

A highly sensitive hydrogen sulfide gas sensor was developed by immobilization of thionine dye doped polyvinyl alcohol film onto the surface of a K⁺-exchanged glass optical waveguide via a spin-coated method. The sensing film presents a color change from purple to colorless when exposed to H₂S gas,causing a decrease in the evanescent-wave absorption of the film,and an increase of the output light intensity of the sensor(signal). The sensor performance was tested for the detection of H₂ S gas by controlled flow injection. The experimental result shows that the sensor has a good linear response(r=0.99667) to H₂S gas in a range of 56 mg/m³ to 0.14 mg/m³. The detection limit for H₂S is 0.11 mg/m³(S/N=3). The RSD of output light intensity is 4.0% and response time (t₉₀) < 2 s. This sensor shows high sensitivity,fast response,good reversibility and repeatability.
- sensor,
- optical waveguide,
- film,
- hydrogen sulfide
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Detection of H₂S Gas by Optical Waveguide Sensor Based on Thionine Doped Polyvinyl Alcohol Film