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Photoactivated {\rm TiO}_{2} Gas Chromatograph Detector for Diverse Chemical Compounds Sensing at Room Temperature

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3 Author(s)
Wei-Cheng Tian ; Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan ; Yu-Hsuan Ho ; Chao-Hung Chou

A photoactivated gas detector operated at room temperature is microfabricated using a simple TiO2 sol-gel process. Prior to ultraviolet (UV) illumination, water-soluble compounds (short-chain alcohols) are dissociated in the thin water film on the TiO2 surface and are detected. However, less water-soluble compounds were not detected because of these water layers. With the increase of the photoinduced oxygen ions by UV illumination, it is first reported that less water-soluble organic compounds (e.g., ethyl acetate and 1, 4-dioxane) are detected with the photoactivated gas detector. The proposed detector greatly extends the detection range of metal-oxide-based sensors for use in gas chromatographs.

Published in:

Sensors Journal, IEEE  (Volume:13 ,  Issue: 5 )

Date of Publication:

May 2013

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