A conducting microfiber comprising graphene/silver nanowires in an agarose matrix with fast humidity sensing ability
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We report agarose-based composite microfibers with enhanced conductivity and fast humidity sensing with conductive nanofillers. The microfibers are fabricated by extruding a hydrogel filament containing silver nanowires (AgNWs) and graphene oxide (GO, chemically reduced after extrusion). For the same concentration, GO enhances the mechanical properties of the microfibers more effectively than AgNWs. Due to synergy between AgNWs and reduced GO (rGO), the microfiber with both fillers shows higher conductivity than those with only one filler. The flexible microfiber retains its conductivity well under repeated bending/unbending cycles. Since rGO ionizes water molecules, the conductivity of the microfiber increases with increasing environmental humidity. The microfiber with both nanofillers respond rapidly and reversibly to humidity changes because the AgNWs facilitate charge carrier transport and water adsorption/desorption.