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Impedimetric sensing of temperature and humidity by using organic-inorganic nanocomposites composed of chitosan and a CuO-Fe3O4 nanopowder

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Abstract

An organic-inorganic nanocomposites composed of chitosan and CuO-Fe3O4 nanopowder with a particle size of 30 ± 10 nm was synthesized and used to prepare sensors pellets of 10 mm i.d. and a thickness of 1 ± 0.1 mm under pressures between of 187 to 565 MPa. A silver paste was deposited on the pellets to introduce electrodes. It is found that the impedance of the material changes with relative humidity (RH) by up to −819.4 kΩ·%−1 RH, and with temperature by up to −378.0 kΩ·°C−1. Response and recovery times for humidity sensing are 20 s and 50 s, correspondingly. The sensor works best in the 20–80 °C temperature range and covers the complete RH range.

Schematic presentation of the chitosan-CuO-Fe3O4 nanopowder used to prepare sensors pellets (10 mm diameter, 1 ± 0.1 mm thickness) under pressure of 187–565 MPa. The change of impedance is up to −819.4 kΩ·%−1 RH and −378.0kΩ °C−1, respectively for humidity and temperature.

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Acknowledgements

This work was funded by the Deanship of Scientific Research (DSR), King Abdulaziz University, Jeddah, under grant No. (130-333-D1435). The author, therefore, acknowledge with thanks the DSR technical and financial support.

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  1. Chemistry Department, Faculty of Science, King Abdulaziz University, Room#576, Building#115, P.O. Box 80203, Jeddah, 21589, Saudi Arabia

    Muhammad Tariq Saeed Chani

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Correspondence to Muhammad Tariq Saeed Chani.

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Chani, M.T.S. Impedimetric sensing of temperature and humidity by using organic-inorganic nanocomposites composed of chitosan and a CuO-Fe3O4 nanopowder. Microchim Acta 184, 2349–2356 (2017). https://doi.org/10.1007/s00604-017-2259-3

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  • DOI: https://doi.org/10.1007/s00604-017-2259-3

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