A conducting composite microfiber containing graphene/silver nanowires in an agarose matrix with fast humidity sensing ability

Yangwoo Lee, Ye Jin Park, Changho Kim, Ju Hee So, Bongjun Yeom, Hyung Jun Koo

Research output: Contribution to journalArticleResearchpeer-review

3 Citations (Scopus)

Abstract

We report agarose-polymer-based composite microfibers with enhanced conductivity and fast humidity sensing owing to incorporation of conductive nanofillers. The microfibers are fabricated by extruding a hydrogel filament containing silver nanowires (AgNWs) and graphene oxide (GO, chemically reduced after extrusion) as 1D and 2D nanofillers, respectively. For the same concentration, GO enhances the mechanical properties of the microfibers more effectively than AgNWs. The microfiber with nanofillers has a higher Young's modulus than commercial nylon-6 and polyamide. 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. Humidity sensing ability of the composite microfiber, based on the humidity-dependent conductivity, is demonstrated. The microfiber with both nanofillers respond rapidly and reversibly to humidity changes because the AgNWs facilitate charge carrier transport and water adsorption/desorption. The humidity sensor based on the composite microfiber also reliably detects repeated short human breaths.

Original languageEnglish
Pages (from-to)1-7
Number of pages7
JournalPolymer
Volume164
DOIs
StatePublished - 2019 Feb 15

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Graphite
Silver
Sepharose
Graphene
Nanowires
Atmospheric humidity
Composite materials
Fillers
Humidity sensors
Carrier transport
Water
Hydrogel
Nylons
Charge carriers
Polyamides
Hydrogels
Oxides
Extrusion
Desorption
Polymers

Keywords

  • Conducting microfibers
  • Fast humidity sensing
  • Polymer composites

Cite this

Lee, Yangwoo ; Park, Ye Jin ; Kim, Changho ; So, Ju Hee ; Yeom, Bongjun ; Koo, Hyung Jun. / A conducting composite microfiber containing graphene/silver nanowires in an agarose matrix with fast humidity sensing ability. In: Polymer. 2019 ; Vol. 164. pp. 1-7.
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abstract = "We report agarose-polymer-based composite microfibers with enhanced conductivity and fast humidity sensing owing to incorporation of conductive nanofillers. The microfibers are fabricated by extruding a hydrogel filament containing silver nanowires (AgNWs) and graphene oxide (GO, chemically reduced after extrusion) as 1D and 2D nanofillers, respectively. For the same concentration, GO enhances the mechanical properties of the microfibers more effectively than AgNWs. The microfiber with nanofillers has a higher Young's modulus than commercial nylon-6 and polyamide. 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. Humidity sensing ability of the composite microfiber, based on the humidity-dependent conductivity, is demonstrated. The microfiber with both nanofillers respond rapidly and reversibly to humidity changes because the AgNWs facilitate charge carrier transport and water adsorption/desorption. The humidity sensor based on the composite microfiber also reliably detects repeated short human breaths.",
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A conducting composite microfiber containing graphene/silver nanowires in an agarose matrix with fast humidity sensing ability. / Lee, Yangwoo; Park, Ye Jin; Kim, Changho; So, Ju Hee; Yeom, Bongjun; Koo, Hyung Jun.

In: Polymer, Vol. 164, 15.02.2019, p. 1-7.

Research output: Contribution to journalArticleResearchpeer-review

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T1 - A conducting composite microfiber containing graphene/silver nanowires in an agarose matrix with fast humidity sensing ability

AU - Lee, Yangwoo

AU - Park, Ye Jin

AU - Kim, Changho

AU - So, Ju Hee

AU - Yeom, Bongjun

AU - Koo, Hyung Jun

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N2 - We report agarose-polymer-based composite microfibers with enhanced conductivity and fast humidity sensing owing to incorporation of conductive nanofillers. The microfibers are fabricated by extruding a hydrogel filament containing silver nanowires (AgNWs) and graphene oxide (GO, chemically reduced after extrusion) as 1D and 2D nanofillers, respectively. For the same concentration, GO enhances the mechanical properties of the microfibers more effectively than AgNWs. The microfiber with nanofillers has a higher Young's modulus than commercial nylon-6 and polyamide. 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. Humidity sensing ability of the composite microfiber, based on the humidity-dependent conductivity, is demonstrated. The microfiber with both nanofillers respond rapidly and reversibly to humidity changes because the AgNWs facilitate charge carrier transport and water adsorption/desorption. The humidity sensor based on the composite microfiber also reliably detects repeated short human breaths.

AB - We report agarose-polymer-based composite microfibers with enhanced conductivity and fast humidity sensing owing to incorporation of conductive nanofillers. The microfibers are fabricated by extruding a hydrogel filament containing silver nanowires (AgNWs) and graphene oxide (GO, chemically reduced after extrusion) as 1D and 2D nanofillers, respectively. For the same concentration, GO enhances the mechanical properties of the microfibers more effectively than AgNWs. The microfiber with nanofillers has a higher Young's modulus than commercial nylon-6 and polyamide. 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. Humidity sensing ability of the composite microfiber, based on the humidity-dependent conductivity, is demonstrated. The microfiber with both nanofillers respond rapidly and reversibly to humidity changes because the AgNWs facilitate charge carrier transport and water adsorption/desorption. The humidity sensor based on the composite microfiber also reliably detects repeated short human breaths.

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