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. 2025 Jan 8;15(2):89. doi: 10.3390/nano15020089

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© 2025 by the author.

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/).

PMC Copyright notice

(a) Conductivity variation with the relative humidity (RH) for Kraft paper, wood nanofibrillated cellulose, and algae cellulose. Reprinted with permission from [103]. Copyright 2015: ACS. (b) Promising wearable applications of RH sensors as respiration sensors. The entire respiration monitoring system consisting of a facemask embedded with a paper respiration sensor, a signal processing circuit, and a mobile device for data display and analysis. Reprinted with permission from [98]. Copyright 2016: Wiley.