“…91 The popular substrate materials used for printing wearable FE include Polyethylene terephthalate (PET), 53,60,63,92–96 PolyEthylene naphthalate (PEN), 16,17,41,54,92,97–99 Polyimide (PI), 14,18,19,30,38,41,42,46,55,57,64,100–102 Cellulose paper, 35,52,103 PDMS 39,42,93,104–111 and Polyurethane (PU). 112 The main conductive materials used for fabricating wearable FE include Silver (Ag), 14,21,31,39,46,52–54,60,63,93,94,97,103,107–119 Copper (Cu), 18,25,29,30,41,55,101,120 Gold (Au), 19,28,38,55,64,92,102,106,121,122 Al, 102 Pt, 37 Graphite, 97,105 Poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate) PEDOT/PSS, 14,16,17,53,93,95,98,121 Graphene 21,57,62,123 and CNT. 21,60,63,93,99,104 The conductive material can be deposited in the form of the inks, however, it is essential to know properties like electrical conductivity, surface tension, additives, solvent, and binder used in the ink compatible for each printing techniques.…”