Highly sensitive humidity sensors based on polyethylene oxide/cuo/multi walled carbon nanotubes composite nanofibers

Ahmad, Waqas and Jabbar, Bushra and Ahmad, Imtiaz and Mohamed Jan, Badrul and Stylianakis, Minas M. and Kenanakis, George and Ikram, Rabia (2021) Highly sensitive humidity sensors based on polyethylene oxide/cuo/multi walled carbon nanotubes composite nanofibers. Materials, 14 (4). ISSN 1996-1944, DOI https://doi.org/10.3390/ma14041037.

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Polymer composites are favorite materials for sensing applications due to their low cost and easy fabrication. In the current study, composite nanofibers consisting of polyethylene oxide (PEO), oxidized multi-walled carbon nanotubes (MWCNT) and copper oxide (CuO) nanoparticles with 1% and 3% of fillers (i.e., PEO-CuO-MWCNT: 1%, and PEO-CuO-MWCNT: 3%) were successfully developed through electrospinning for humidity sensing applications. The composite nanofibers were characterized by FTIR, XRD, SEM and EDX analysis. Firstly, they were loaded on an interdigitated electrode (IDE), and then the humidity sensing efficiency was investigated through a digital LCR meter (E4980) at different frequencies (100 Hz-1 MHz), as well as the percentage of relative humidity (RH). The results indicated that the composite nanofibers containing 1% and 3% MWCNT, combined with CuO in PEO polymer matrix, showed potent resistive and capacitive response along with high sensitivity to humidity at room temperature in an RH range of 30-90%. More specifically, the PEO-CuO-MWCNT: 1% nanocomposite displayed a resistive rapid response time within 3 s and a long recovery time of 22 s, while the PEO-CuO-MWCNT: 3% one exhibited 20 s and 11 s between the same RH range, respectively.

Item Type: Article
Funders: Malaysia-Thailand Joint Authority [IF0622019], Fundamental Research Grant Scheme [FP050-2019A], Universiti Malaya [GPF078A2018], National Priorities Research Program from the Qatar National Research Fund (member of The Qatar Foundation) [NPRP11S-1128-170042]
Uncontrolled Keywords: Polyethylene oxide; Oxidized multi-walled carbon nanotubes; Humidity sensors; Copper oxide; Composite nanofibers; electrospinning
Subjects: Q Science > QC Physics
T Technology > TP Chemical technology
Divisions: Faculty of Engineering > Department of Chemical Engineering
Depositing User: Ms Zaharah Ramly
Date Deposited: 20 Apr 2022 06:39
Last Modified: 20 Apr 2022 06:39
URI: http://eprints.um.edu.my/id/eprint/28746

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