Abstract
Fabricated multifunctional sensors have the following structure: the flexible transparent conductive sheet as the first electrode, the orange dye as sensitive material and the CNT film as second electrode deposited on the flexible rubber substrate by rubbing-in technology. The samples (ITO/OD/CNT/Rubber) were investigated under the effects of displacement, pressure, temperature, relative humidity and infrared irradiation (IR). It was observed that under the effect of 25-µm displacement, the resistance and the impedances at 100 Hz, 1 kHz and 10 kHz decreased by 1.62, 1.34, 1.26 and 1.23 times, accordingly. Under the effect of pressure up to 47 gf/cm2, the resistance and impedances at 100 Hz, 1 kHz and 10 kHz decreased, respectively, by 1.35, 1.34, 1.32 and 1.29 times. The illumination of the samples by infrared irradiations of intensity up to 4830 W/m2 brings to decrease the resistance and impedances up to 5 and 2 times, accordingly. By investigating temperature dependences of the impedances, it was found that the temperature coefficients of the impedances for frequencies of 100 Hz, 1 kHz and 10 kHz were equal to 0.037, 0.036 and 0.035 °C−1, respectively. The change in impedance/resistance with variation in the displacement, pressure, temperature and infrared irradiation may be explained by percolation theory. Investigation of humidity effect on the impedances of sensor showed that the decreased impedances (on increasing humidity) can be estimated by the humidity coefficients of impedance, which were equal to 0.020, 0.0190 and 0.014 RH−1 for the frequencies of 100 Hz, 1 kHz and 10 kHz. The investigation of frequency response showed that the samples are high-pass filter with cutoff frequency of 100 Hz. The fabricated devices may be implemented for various industrial and environmental applications.
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Acknowledgements
This Project was funded by the Deanship of Scientific Research (DSR) at King Abdulaziz University, Jeddah, under grant no. G: 280-130-1441. The authors, therefore, acknowledge with thanks DSR for technical and financial support.
Funding
This Project was funded by the Deanship of Scientific Research (DSR) at King Abdulaziz University, Jeddah, under grant no. G: 280-130-1441.
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Conceptualization was done by MTSC and KSK; methodology was done by MTSC; software was done by MTSC; validation was done by MTSC, KSK and IU; formal analysis was done by MTSC and AMA; investigation was done by MTSC and IU; resources were done by KSK; data curation was done by MTSC and IU; writing—original draft preparation were done by MTSC; writing—review and editing were done by KSK, IU and AMA; visualization was done by KSK; supervision was done by MTSC; project administration was done by MTSC and KSK; funding acquisition was done by MTSC. All authors have read and agreed to the published version of the manuscript.
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Chani, M.T.S., Karimov, K.S., Ullah, I. et al. Electric properties of the ITO-orange dye-CNT-rubber cell-based flexible multifunctional sensors. J Mater Sci: Mater Electron 33, 24933–24941 (2022). https://doi.org/10.1007/s10854-022-09202-9
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DOI: https://doi.org/10.1007/s10854-022-09202-9