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. 2022 May 10;12(10):1628. doi: 10.3390/nano12101628

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© 2022 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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(a) Gas selectivity of the CeO₂-Pd-PDA/rGO sensor at 100 °C and 0% RH towards different gases at 50 ppm; (b) long-term sensor stability towards 6000 ppm H₂ at 100 °C and 0% RH over seven months.