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Impedimetric sensing of humidity and temperature using CeO2–Co3O4 nanoparticles in polymer hosts

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Abstract

Humidity and temperature sensors were fabricated from a nanocomposite consisting of CeO2-Co3O4 hybrid nanoparticle-silicone adhesive and CeO2-Co3O4 hybrid nanoparticle-polymer adhesive, respectively, to fix the material on a glass supported copper electrode. The impedance of the sensor decreases by a factor of 960 at a working frequency of 100 Hz, and by a factor of 800 at 1 kHz, on increasing relative humidity (RH) from 30 to 90 %. In parallel, the capacitances increase by factors of 567 and 355, respectively, under the same experimental conditions. The effect of temperature in the range from 25 to 70 °C on impedance (again at 100 Hz and 1 kHz) was also studied and found to decrease with increasing temperature. On going from 25 to 70 °C, the impedance measured at 100 Hz and 1 kHz decreases 2.22 and 1.58 times, respectively, in surface type sensors, while in sandwich type sensors this decrease is 3.0 and 2.08 times. The calculated average sensitivity to temperature is −1.02 and −0.8 % °C−1 for the surface type and −1.5 and −1.2 % °C−1 for the sandwich type sensors at frequencies of 100 Hz and 1 kHz, respectively.

A highly sensitive sensor with dual functionality for humidity and temperature has been fabricated by using CeO2-codoped Co3O4 nanoparticles with silicone and polymer adhesive.

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Acknowledgments

This project was funded by the Center of Excellence for Advanced Materials Research (CEAMR), King Abdulaziz University, Jeddah, under grant no. (CEAMR-SG-2-436).

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Authors and Affiliations

  1. Chemistry Department, Faculty of Science, King Abdulaziz University, P. O. Box 80203, Jeddah, 21589, Saudi Arabia

    Sher Bahadar Khan, Muhammad Tariq Saeed Chani & Abdullah M. Asiri

  2. Center of Excellence for Advanced Materials Research, King Abdulaziz University, Jeddah, 21589, P.O. Box 80203, Saudi Arabia

    Sher Bahadar Khan, Muhammad Tariq Saeed Chani & Abdullah M. Asiri

  3. GIK Institute of Engineering Sciences and Technology, Topi, 23640, Swabi, Pakistan

    Khasan S. Karimov & Noshin Fatima

  4. Physical Technical Institute, Aini St. 299/1, Dushanbe, 734063, Tajikistan

    Khasan S. Karimov

  5. Division of Nano Sciences and Department of Chemistry, Ewha Womans University, Seoul, 120-750, South Korea

    Kalsoom Akhtar

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  1. Sher Bahadar Khan
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  2. Khasan S. Karimov
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  3. Muhammad Tariq Saeed Chani
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  4. Abdullah M. Asiri
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  6. Noshin Fatima
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Correspondence to Sher Bahadar Khan.

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Khan, S.B., Karimov, K.S., Chani, M.T.S. et al. Impedimetric sensing of humidity and temperature using CeO2–Co3O4 nanoparticles in polymer hosts. Microchim Acta 182, 2019–2026 (2015). https://doi.org/10.1007/s00604-015-1529-1

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  • DOI: https://doi.org/10.1007/s00604-015-1529-1

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