Author(s)

Lam Minh Long¹, Tran Quang Trung², Vo-Van Truong³, Nguyen Nang Dinh¹

¹University of Engineering and Technology, VNU in Hanoi, Hanoi, Vietnam.
²University of Natural Science, VNU in HoChiMinh City, Ho Chi Minh City, Vietnam.
³Department of Physics, Concordia University, Montreal, Canada.

Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) incorporated with nanocrystalline TiO₂ powder (PEDOT:PSS+nc-TiO₂) films were prepared by spin-coating technique. SEM surface morphology, UV-Vis spectra and NH₃ gas sensing of were studied. Results showed that the PEDOT:PSS+nc-TiO₂ film with a content of 9.0 wt% of TiO₂ is most suitable for both the hole transport layer and the NH₃ sensing. The responding time of the sensor made from this composite film reached a value as fast as 20 s. The rapid responsiveness to NH₃ gas was attributed to the efficient movement of holes as the major charge carriers in PEDOT:PSS+nc-TiO₂ composite films. Useful applications in organic electronic devices like light emitting diodes and gas thin film sensors can be envisaged.

PEDOT:PSS+nc-TiO₂ Composite, UV-Vis Spectra, J-V Characteristic, Thermal Sensing Property, Hole Transport Layer, NH₃ Gas Sensing

Long, L. , Trung, T. , Truong, V. and Dinh, N. (2017) Optical and NH₃ Gas Sensing Properties of Hole-Transport Layers Based on PEDOT: PSS Incorporated with Nano-TiO₂. Materials Sciences and Applications, 8, 663-672. doi: 10.4236/msa.2017.89047.