Fig. 8

Nanomaterial composites fabricated by EHD printing technology for electrodes and sensors. a Graphene/methyl-red composite-based humidity sensor schematic representation, reprinted from reference [55]. b Cyclic voltammetry curves of the G/Pt microelectrodes, reprinted from reference [56]. c Strain sensor schematic illustration. d Depending on the tensile strain, the plot of the changes in resistance of the strain sensor Gel-TA12, reprinted from reference [57]