TITLE:
Optical and NH3 Gas Sensing Properties of Hole-Transport Layers Based on PEDOT: PSS Incorporated with Nano-TiO2
AUTHORS:
Lam Minh Long, Tran Quang Trung, Vo-Van Truong, Nguyen Nang Dinh
KEYWORDS:
PEDOT:PSS+nc-TiO2 Composite, UV-Vis Spectra, J-V Characteristic, Thermal Sensing Property, Hole Transport Layer, NH3 Gas Sensing
JOURNAL NAME:
Materials Sciences and Applications,
Vol.8 No.9,
August
21,
2017
ABSTRACT: 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.