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. 2022 Apr 26;16(6):8630–8640. doi: 10.1021/acsnano.1c10728

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© 2022 The Authors. Published by American Chemical Society

Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained (https://creativecommons.org/licenses/by/4.0/).

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Selective water-vapor sensing performance of pyrolyzed cellulose nanofiber paper (CNP). (a) Optical image of the sensor device consisting of the CNP pyrolyzed at 600 °C and comb-type Au electrodes. (b) Resistance as a function of time upon exposure to water vapor with different relative humidity (RH) values at 30 °C. (c) Change in resistance (|ΔR|) as a function of RH. (d) |ΔR| upon exposure to water vapor with different RH values, O₂, CO₂ (1000 ppm in air), and ethanol (EtOH, 20 ppm in air) at 30 °C, and H₂ (200 ppm in air) at 50 °C. (e) Water vapor sensing in exhaled human breath (introduction time, 1 s; interval time, 59 s).