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. 2020 Jul 15;20(14):3927. doi: 10.3390/s20143927

Figure 3.

Figure 3

Graphene-based activity sensors. Strain sensors; (a) fragmentized graphene foam (FGF) and the relative resistance change of the sensor with different content of FGF with isopropyl alcohol (IPA) under strain (Reproduced with permission [53] copyright 2015, Wiley-VCH). (b) Schematic illustration of fabricating a fish-scale-like rGO strain sensor (FSG) and relative resistance responses of FSG strain sensor (reproduced with permission [66] copyright 2016, American Chemical Society). Pressure sensors; (c) a hybrid structure GO/Gr (graphene) pressure sensor using graphene oxide-assisted dispersion of graphene and resistive pressure sensor characteristics under pressure (reproduced with permission [73] copyright 2017, American Chemical Society). (d) Paper-based flexible pressure sensors for monitoring human activity and their applications for respiration detection, pulse detection, movement monitoring, and voice recognition (reproduced with permission [74] copyright 2017, American Chemical Society).