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Liquid metal and Mxene enable self-healing soft electronics based on double networks of bacterial cellulose hydrogels
Ming Wang1, Orlando J Rojas2, Like Ning3
1State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510641, China; Department of Chemical and Biological Engineering, University of British Columbia, 2360, East Mall, Vancouver, BC V6T 1Z3, Canada; Department of Chemistry, University of British Columbia, 2360, East Mall, Vancouver, BC V6T 1Z3, Canada; Department of Wood Science, University of British Columbia, 2360, East Mall, Vancouver, BC V6T 1Z3, Canada.
Abstract:
Liquid metal (LM) nanodroplets and MXene nanosheets are integrated with sulfonated bacterial nanocellulose (BNC) and acrylic acid (AA). Upon fast sonication, AA polymerization leads to a crosslinked composite hydrogel in which BNC exfoliates Mxene, forming organized conductive pathways. Soft conducting properties are achieved in the presence of colloidally stable core-shell LM nanodroplets. Due to the unique gelation mechanism and the effect of Mxene, the hydrogels spontaneously undergo surface wrinkling, which improves their electrical sensitivity (GF = 8.09). The hydrogels are further shown to display interfacial adhesion to a variety of surfaces, ultra-elasticity (tailorable elongation, from 1000 % to 3200 %), indentation resistance and self-healing capabilities. Such properties are demonstrated in wearable, force mapping, multi-sensing and patternable electroluminescence devices.
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