Organic humidity sensing film optimization by embedding inorganic nano-anatase TiO2 powder

Azmer, Mohamad Izzat and Zafar, Qayyum and Qadir, Karwan Wasman and Sulaiman, Khaulah and Bawazeer, Tahani M. and Alsoufi, Mohammad S. (2018) Organic humidity sensing film optimization by embedding inorganic nano-anatase TiO2 powder. Applied Physics A, 124 (7). p. 508. ISSN 0947-8396, DOI

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In this work, surface-type humidity sensors with P3HT (organic) and P3HT–TiO2 (organic–inorganic hybrid) active layers have been fabricated. The surface morphology of the humidity active films has been studied by atomic force microscopy, whereas their crystalline structure has been studied by X-ray diffraction. We have aimed at improving the sensing parameters of P3HT-based humidity sensor, by embedding nano-anatase TiO2 powder in pristine organic P3HT moiety. The capacitance versus relative humidity (%RH) response curves of the organic and hybrid humidity sensors have been examined in 30–98%RH range (dark ambient condition, room temperature). In general, an increase in capacitance has been observed in both sensors with the increment in RH level. The observed response of both humidity sensors is believed to be associated with polarization change due to the adsorption of water molecules and transfer of charge carriers due to the formation of charge transfer complexes. The hybrid-based humidity sensor has shown significantly improved humidity-sensing parameters, i.e., fivefold higher sensitivity, with hysteresis reduced to one-third as compared to that of pristine organic humidity sensor. A relatively faster response and recovery time has also been obtained by the hybrid sample.

Item Type: Article
Uncontrolled Keywords: Adsorption of water; Ambient conditions; Charge transfer complex; Crystalline structure; Faster response and recovery time; Humidity sensing; Inorganic hybrids; Transfer of charges
Subjects: Q Science > Q Science (General)
Q Science > QC Physics
Q Science > QD Chemistry
T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Science > Department of Physics
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 18 Sep 2019 02:05
Last Modified: 18 Sep 2019 02:05

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