Fig. 10.

a Graphene oxide-based humidity sensors from exhaled breath. Reprinted with permission from [290]. Copyright 2013 American Chemical Society. b Bio-inspired atomic precise tunable graphene for humidity detection from breath. Reprinted with permission [291]. Copyright 2018 American Chemical Society. c Schematic representation of PVDF/rGO nanofibers and polyaniline-based wearable sensor for humidity detection. Reprinted with permission from [292]. Copyright 2019 American Chemical Society. d Porous graphene coated with PEDOT: PSS, GO, and Ag colloids for respiration monitoring. Reprinted with permission from [275]. Copyright 2018 Elsevier. e GO and aniline-based humidity sensor. Reprinted with permission from [293]. Copyright 2020 Wiley–VCH. f Non-woven fabric and graphene oxide-based respiration monitoring with the application demonstrated in a mask. Reprinted with permission from [294]. Copyright 2020 American Chemical Society