“…72 Various nanomaterials and nanostructures have been used in e-skin fabrication to make the sensory function more profound and add some features such as conductivity. For example, nanomaterials such as AgNWs, 55,60,62,76,195 carbon nanotubes for electrical conductivity, 63 halloysite nanotubes (HNT), 64 MWCNT, 66,228 AuNPs, 67 Au nanolayer, 78,194 and nanolayers of metals like aluminium and gold to enhance the sensitivity, which was tunable by the thickness of the membrane, 58 Ag nanocrystals (NCs), 70 cellulose nanofibrils (CNFs), 71 and most recently MXenes (Ti 3 C 2 T x ) 66,69,72,74 have been used by researchers in the past few years.…”