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Evaluation of humidity sensing properties of TMBHPET thin film embedded with spinel cobalt ferrite nanoparticles

In this study, we report the enhanced sensing parameters of previously reported TMBHPET-based humidity sensor. Significant improved sensing performance has been demonstrated by coupling of TMBHPET moisture sensing thin film with cobalt ferrite nanoparticles (synthesized by eco-benign ultrasonic meth...

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Main Authors: Zafar, Q., Azmer, M.I., Al-Sehemi, A.G., Al-Assiri, M.S., Kalam, A., Sulaiman, K.
Format: Article
Published: Kluwer (now part of Springer) 2016
Subjects:
Q Science (General)
QC Physics
Online Access:http://eprints.um.edu.my/18728/
http://dx.doi.org/10.1007/s11051-016-3488-9
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spelling my.um.eprints.187282018-05-28T01:17:13Z http://eprints.um.edu.my/18728/ Evaluation of humidity sensing properties of TMBHPET thin film embedded with spinel cobalt ferrite nanoparticles Zafar, Q. Azmer, M.I. Al-Sehemi, A.G. Al-Assiri, M.S. Kalam, A. Sulaiman, K. Q Science (General) QC Physics In this study, we report the enhanced sensing parameters of previously reported TMBHPET-based humidity sensor. Significant improved sensing performance has been demonstrated by coupling of TMBHPET moisture sensing thin film with cobalt ferrite nanoparticles (synthesized by eco-benign ultrasonic method). The mean size of CoFe2O4 nanoparticles has been estimated to be ~ 6.5 nm. It is assumed that the thin film of organic–ceramic hybrid matrix (TMBHPET:CoFe2O4) is a potential candidate for humidity sensing utility by virtue of its high specific surface area and porous surface morphology (as evident from TEM, FESEM, and AFM images). The hybrid suspension has been drop-cast onto the glass substrate with preliminary deposited coplanar aluminum electrodes separated by 40 µm distance. The influence of humidity on the capacitance of the hybrid humidity sensor (Al/TMBHPET:CoFe2O4/Al) has been investigated at three different frequencies of the AC applied voltage (Vrms ~ 1 V): 100 Hz, 1 kHz, and 10 kHz. It has been observed that at 100 Hz, under a humidity of 99 % RH, the capacitance of the sensor increased by 2.61 times, with respect to 30 % RH condition. The proposed sensor exhibits significantly improved sensitivity ~560 fF/ % RH at 100 Hz, which is nearly 7.5 times as high as that of pristine TMBHPET-based humidity sensor. Further, the capacitive sensor exhibits improved dynamic range (30–99 % RH), small hysteresis (~2.3 %), and relatively quicker response and recovery times (~12 s, 14 s, respectively). It is assumed that the humidity response of the sensor is associated with the diffusion kinetics of water vapors and doping of the semiconductor nanocomposite by water molecules. Kluwer (now part of Springer) 2016 Article PeerReviewed Zafar, Q. and Azmer, M.I. and Al-Sehemi, A.G. and Al-Assiri, M.S. and Kalam, A. and Sulaiman, K. (2016) Evaluation of humidity sensing properties of TMBHPET thin film embedded with spinel cobalt ferrite nanoparticles. Journal of Nanoparticle Research, 18 (7). p. 186. ISSN 1388-0764 http://dx.doi.org/10.1007/s11051-016-3488-9 doi:10.1007/s11051-016-3488-9
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Research Repository
url_provider http://eprints.um.edu.my/
topic Q Science (General)
QC Physics
spellingShingle Q Science (General)
QC Physics
Zafar, Q.
Azmer, M.I.
Al-Sehemi, A.G.
Al-Assiri, M.S.
Kalam, A.
Sulaiman, K.
Evaluation of humidity sensing properties of TMBHPET thin film embedded with spinel cobalt ferrite nanoparticles
description In this study, we report the enhanced sensing parameters of previously reported TMBHPET-based humidity sensor. Significant improved sensing performance has been demonstrated by coupling of TMBHPET moisture sensing thin film with cobalt ferrite nanoparticles (synthesized by eco-benign ultrasonic method). The mean size of CoFe2O4 nanoparticles has been estimated to be ~ 6.5 nm. It is assumed that the thin film of organic–ceramic hybrid matrix (TMBHPET:CoFe2O4) is a potential candidate for humidity sensing utility by virtue of its high specific surface area and porous surface morphology (as evident from TEM, FESEM, and AFM images). The hybrid suspension has been drop-cast onto the glass substrate with preliminary deposited coplanar aluminum electrodes separated by 40 µm distance. The influence of humidity on the capacitance of the hybrid humidity sensor (Al/TMBHPET:CoFe2O4/Al) has been investigated at three different frequencies of the AC applied voltage (Vrms ~ 1 V): 100 Hz, 1 kHz, and 10 kHz. It has been observed that at 100 Hz, under a humidity of 99 % RH, the capacitance of the sensor increased by 2.61 times, with respect to 30 % RH condition. The proposed sensor exhibits significantly improved sensitivity ~560 fF/ % RH at 100 Hz, which is nearly 7.5 times as high as that of pristine TMBHPET-based humidity sensor. Further, the capacitive sensor exhibits improved dynamic range (30–99 % RH), small hysteresis (~2.3 %), and relatively quicker response and recovery times (~12 s, 14 s, respectively). It is assumed that the humidity response of the sensor is associated with the diffusion kinetics of water vapors and doping of the semiconductor nanocomposite by water molecules.
format Article
author Zafar, Q.
Azmer, M.I.
Al-Sehemi, A.G.
Al-Assiri, M.S.
Kalam, A.
Sulaiman, K.
author_facet Zafar, Q.
Azmer, M.I.
Al-Sehemi, A.G.
Al-Assiri, M.S.
Kalam, A.
Sulaiman, K.
author_sort Zafar, Q.
title Evaluation of humidity sensing properties of TMBHPET thin film embedded with spinel cobalt ferrite nanoparticles
title_short Evaluation of humidity sensing properties of TMBHPET thin film embedded with spinel cobalt ferrite nanoparticles
title_full Evaluation of humidity sensing properties of TMBHPET thin film embedded with spinel cobalt ferrite nanoparticles
title_fullStr Evaluation of humidity sensing properties of TMBHPET thin film embedded with spinel cobalt ferrite nanoparticles
title_full_unstemmed Evaluation of humidity sensing properties of TMBHPET thin film embedded with spinel cobalt ferrite nanoparticles
title_sort evaluation of humidity sensing properties of tmbhpet thin film embedded with spinel cobalt ferrite nanoparticles
publisher Kluwer (now part of Springer)
publishDate 2016
url http://eprints.um.edu.my/18728/
http://dx.doi.org/10.1007/s11051-016-3488-9
_version_ 1643690778393837568
score 13.211869

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