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Pressure sensors toward directional-selective sensing. a Fabricated process and b working principle of two orthogonal CPSS-based bending sensor [70]. Copyright (2016) Wiley–VCH. c Schematic illustration of the bending-insensitive sensor based on coplanar electrodes. d Schematic diagram of dielectric material variation under pressure. e Bending test under certain pressure [227]. Copyright (2018) Wiley–VCH
