fig2

Figure 2. (A) Schematic diagram of common pressure sensing mechanisms: (i) resistive, (ii) capacitive, (iii) piezoelectric, (iv) triboelectric; (B) the microstructure and sensing mechanism of porous MWCNT-PGS sensors^[45]; (C) the structure, performance, sensing mechanism of piezoresistive sensors with interlocking microsphere array interlocked microdome arrays structure^[46,47]; (D) the preparation process and microstructure of the multi-scale dome/spire + stepped structure pressure sensor^[51]. MWCNT-PGS: A biodegradable porous piezoresistive sensor; PDMS: polydimethylsiloxane; PEDOT: poly(3,4-ethylenedioxythiophene).