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. 2021 Jun 14;12(6):695. doi: 10.3390/mi12060695

Figure 4.

Figure 4

Several typical pressure sensor structures. (a) Schematic illustration of biocomposite film-based flexible piezoresistive pressure sensor (Reprinted with permission from ref. [48]. Copyright 2020 Elsevier); (b) Piezoresistive pressure sensor composed of a conducting pyramid structure (Reprinted with permission from ref. [68]. Copyright 2018 The American Association for the Advancement of Science); (c) Piezoresistive pressure sensor with sandwich layers (Reprinted with permission from ref. [59]. Copyright 2019 American Chemical Society); (d) Conductive leather with CNT for piezoresistive pressure sensor (Reprinted with permission from ref. [33]. 2018 The Authors); (e) Strain-based ultra-sensitive piezoresistive pressure sensor using closely spaced nanoparticle films (Reprinted with permission from ref. [69]. Copyright 2019 The Authors); (f) Schematic illustration of the wrinkled capacitive pressure sensors (Reprinted with permission from ref. [70]. Copyright 2017 Royal Society of Chemistry); (g) Capacitive pressure detection integrating conductive microstructure air-gap gate with two-dimensional semiconductor transistor (Reprinted with permission from ref. [71]. Copyright 2020 Springer Nature); (h) Flexible piezoelectric pressure sensors composed of PVDF/PEDOT (Reprinted with permission from ref. [72]. Copyright 2018 The Authors); (i) Piezoelectric senor based on Van der Waals materials (Reprinted with permission from ref. [46]. Copyright 2021 The Authors); (j) Flexible iontronic sensor combining traditional paper with ion sensitive materials (Reprinted with permission from ref. [73]. Copyright 2019 John Wiley and Sons); (k) GIA-based iontronic pressure sensor with graded intrafillable architecture between the dielectric layers (Reprinted with permission from ref. [67] Copyright 2020 The Authors).