|Title:||A photoactivated gas detector for toluene sensing at room temperature based on new coral-like ZnO nanostructure arrays||Authors:||Yeh L.-K.
|Keywords:||PhotoactivationRoom temperature sensingZnO coral-like nanostructuresZnO gas detector||Issue Date:||2016||Journal Volume:||16||Journal Issue:||11||Source:||Sensors (Switzerland)||Abstract:||
A photoactivated gas detector operated at room temperature was microfabricated using a simple hydrothermal method. We report that the photoactivated gas detector can detect toluene using a UV illumination of 2 £gW/cm2. By ultraviolet (UV) illumination, gas detectors sense toluene at room temperature without heating. A significant enhancement of detector sensitivity is achieved because of the high surface-area-to-volume ratio of the morphology of the coral-like ZnO nanorods arrays (NRAs) and the increased number of photo-induced oxygen ions under UV illumination. The corresponding sensitivity (DR/R0) of the detector based on coral-like ZnO NRAs is enhanced by approximately 1022% compared to that of thin-film detectors. The proposed detector greatly extends the dynamic range of detection of metal-oxide-based detectors for gas sensing applications. We report the first-ever detection of toluene with a novel coral-like NRAs gas detector at room temperature. A sensing mechanism model is also proposed to explain the sensing responses of gas detectors based on coral-like ZnO NRAs. ? 2016 by the authors; licensee MDPI, Basel, Switzerland.
|Appears in Collections:||化學工程學系|
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