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. 2022 Jul 14;9(26):2202470. doi: 10.1002/advs.202202470

Figure 3.

Figure 3

Decoupling target input by suppressing the influence of the other input signals. a) Pressure‐insensitive strain (PIS) sensor based on multiwalled carbon nanotubes (MWCNTs) and PDMS composite materials. Reproduced with permission.[ 14 ] Copyright 2018, American Chemical Society. i) Scanning electron microscopy (SEM) images of the PIS sensor without (top) and with (bottom) tensile strain. ii) SEM images of the composite materials with a porous structure (top), and the zoomed version shows that most of the MWCNTs are embedded in the PDMS (bottom). iii) Photograph (top) and corresponding impedance analysis (bottom) of the PIS sensor under initial, pressured, and locally strained conditions. b) Transparent pressure sensor that is insensitive to bending. Reproduced with permission.[ 37 ] Copyright 2016, Nature Publishing Group. i) Schematic diagram of the bending‐insensitive pressure sensor. ii) SEM image of the fiber layer. iii) SEM image of the fiber layer under tensile strain. iv) SEM image of the fiber layer under shear force. v) Sensor responds to pressure (0.4 and 1.6 g) at different bending radii (from 1.5 cm to 80 µm). c) E‐skin based on potentiometric mechanotransduction mechanism[ 39 ] and its schematic illustration shown in (i). Two electrodes with reversible oxidation–reduction reactions are used to create a potential difference, where the microstructured ionic composite between electrodes alters the potential under an applied force. ii) Circuit model of the strain‐insensitive potentiometric sensor. iii) Almost invariable force sensing performance with or without 50% strain. Reproduced under the terms of the Creative Commons CC BY NC License.[ 39 ] Copyright 2020, The Authors, published by The American Association for the Advancement of Science.