Optical and NH<sub>3</sub> Gas Sensing Properties of Hole-Transport Layers Based on PEDOT: PSS Incorporated with Nano-TiO<sub>2</sub> — Oak Academic Publishing
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Optical and NH<sub>3</sub> Gas Sensing Properties of Hole-Transport Layers Based on PEDOT: PSS Incorporated with Nano-TiO<sub>2</sub>
University of Engineering and Technology, VNU in Hanoi, Hanoi, Vietnam
,
University of Natural Science, VNU in HoChiMinh City, Ho Chi Minh City, Vietnam
,
Department of Physics, Concordia University, Montreal, Canada
,
University of Engineering and Technology, VNU in Hanoi, Hanoi, Vietnam
1 University of Engineering and Technology, VNU in Hanoi, Hanoi, Vietnam
2 University of Natural Science, VNU in HoChiMinh City, Ho Chi Minh City, Vietnam
3 Department of Physics, Concordia University, Montreal, Canada
4 University of Engineering and Technology, VNU in Hanoi, Hanoi, Vietnam
Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) incorporated with nanocrystalline TiO 2 powder (PEDOT:PSS+nc-TiO 2 ) films were prepared by spin-coating technique. SEM surface morphology, UV-Vis spectra and NH 3 gas sensing of were studied. Results showed that the PEDOT:PSS+nc-TiO 2 film with a content of 9.0 wt% of TiO 2 is most suitable for both the hole transport layer and the NH 3 sensing. The responding time of the sensor made from this composite film reached a value as fast as 20 s. The rapid responsiveness to NH 3 gas was attributed to the efficient movement of holes as the major charge carriers in PEDOT:PSS+nc-TiO 2 composite films. Useful applications in organic electronic devices like light emitting diodes and gas thin film sensors can be envisaged.
KeywordsPEDOT:PSS+nc-TiO<sub>2</sub>CompositeUV-Vis SpectraJ-V CharacteristicThermal Sensing PropertyHole Transport LayerNH<sub>3</sub>Gas Sensing
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