Analytical Sciences

Optical-Electricity Gas-Sensing Property Detection of SDBS-WO₃ Film at Room Temperature

Yuan ZHANG, Jiaming WANG, Hannikezi ABUDUKEREMU, Patima NIZAMIDIN, Shawket ABLIZ, and Abliz YIMIT

College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi, Xinjiang, 830046, P. R. China

In this work, sodium dodecyl benzene sulfonate (SDBS) was used as a dispersing agent; a WO₃ nanoparticle suspension was used as a sensing material. The SDBS-WO₃ thin film/Sn-doped glass optical waveguide sensor element was prepared by spin coating. The sensing material was characterized by Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and field-emission scanning electron microscopy (FESEM). The gas-sensing characteristics of the fabricated sensors were studied at room temperature for various gases. The experimental results indicate that the sensor exhibited a high selective response toward SO₂ and H₂S and a low detection limit of 10 ppb to SO₂ and H₂S. The response/recovery times for SO₂ and H₂S were 2/23 and 2/18 s. However, during an electrochemical gas-sensing performance test of the SDBS-WO₃ film at room temperature, the results indicated that the trend of the variation in resistance was consistent with the variation in the output light.

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