Compositional engineering of VOPcPhO-TiO2 nano-composite to reduce the absolute threshold value of humidity sensors

Azmer, M.I. and Aziz, F. and Ahmad, Z. and Raza, E. and Najeeb, M.A. and Fatima, N. and Bawazeer, T.M. and Alsoufi, M.S. and Shakoor, R.A. and Sulaiman, K. (2017) Compositional engineering of VOPcPhO-TiO2 nano-composite to reduce the absolute threshold value of humidity sensors. Talanta, 174. pp. 279-284. ISSN 0039-9140

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Official URL: https://doi.org/10.1016/j.talanta.2017.06.016

Abstract

This research work demonstrates compositional engineering of an organic-inorganic hybrid nano-composites for modifying absolute threshold of humidity sensors. Vanadyl-2,9,16,23-tetraphenoxy-29H,31H-phthalocyanine (VOPcPhO), an organic semiconductor, doped with Titanium-dioxide nanoparticles (TiO2 NPs) has been employed to fabricate humidity sensors. The morphology of the VOPcPhO:TiO2 nano-composite films has been analyzed by atomic force microscopy (AFM) and field emission scanning electron microscopy (FESEM). The sensors have been examined over a wide range of relative humidity i.e. 20–99% RH. The sensor with TiO2 (90 nm) shows reduced sensitivity-threshold and improved linearity. The VOPcPhO:TiO2 (90 nm) nano-composite film is comprised of uniformly distributed voids which makes the surface more favorable for adsorption of moisture content from environment. The VOPcPhO:TiO2 nano-composite based sensor demonstrates remarkable improvement in the sensing parameter when equated with VOPcPhO sensors.

Item Type: Article
Uncontrolled Keywords: Absolute threshold; VOPcPhO:TiO2; Nano-composite; Compositional engineering; Relative humidity
Subjects: Q Science > Q Science (General)
T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Science > Dept of Physics
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 21 Jul 2017 02:30
Last Modified: 21 Jul 2017 02:30
URI: http://eprints.um.edu.my/id/eprint/17552

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