Molecular‐Level Contact of Graphene/Silver Nanowires through Simultaneous Dispersion for a Highly Stable Wearable Electrothermal Heater. Issue 9 (4th July 2021)

• Record Type: Journal Article
• Authors: Kwon, Minho; Kim, Hanyoung; Mohanty, Aruna Kumar; Yang, Jiyeon; Piao, Longhai; Joo, Sang‐Woo; Han, Joong Tark; Han, Jong Hun; Paik, Hyun‐jong
• Is Part Of: Advanced materials technologies. Volume 6:Issue 9(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-07-04
• Subjects: graphene -- molecular‐level contact -- multifunctional polymer -- silver nanowire -- wearable heater; Materials science -- Periodicals; Technological innovations -- Periodicals; Materials science; Technological innovations; Periodicals; 620.1105
• DOI: 10.1002/admt.202100177
• Languages: English
• ISSNs: 2365-709X

Abstract

Abstract: Silver nanowires (AgNWs) with low sheet resistances are excellent potential candidates for high‐performance wearable electrothermal heaters operated through Joule heating. However, the thermal oxidation and electrical instability of AgNWs caused by high contact resistance and poor adhesion to different substrates considerably limit their use in devices. Graphene is used in a AgNW/graphene hybrid owing to its low oxygen permeability, lower contact resistance with AgNWs, and good van der Waals interactions. Molecular‐level contacts between AgNWs and graphene must be achieved to maximize the synergy of these properties. In this study, a multifunctional polymer possessing styrene sulfonate‐based copolymer and disulfide groups is designed; these groups allow the simultaneous dispersion of AgNWs and graphene in an aqueous solution through self‐assembly. Since this polymer promotes molecular‐level contact between AgNWs and graphene, the oxidation and Joule‐heating stabilities of the hybrid dramatically increase. In addition, a freestanding AgNW/graphene film is readily prepared, exhibiting good attachable properties on various substrates and superior stability under harsh conditions (85 °C and 85% relative humidity for 7 days). The AgNW/graphene hybrid film displays a low sheet resistance (0.36 ± 0.02 Ω sq −1 ) with good performance as a high‐performance electrothermal heater (200 °C at 1.5 V). Abstract : The design of a multifunctional polymer allows molecular‐level contact between silver nanowires (AgNWs) and graphene. A AgNW/graphene hybrid material is prepared by self‐assembly and simultaneous dispersion in an aqueous solution is possible. Molecular‐level contact creates a freestanding hybrid material film exhibiting oxidation stability and Joule‐heating stability. This hybrid film can be used as a wearable heater.