期刊
NANO LETTERS
卷 21, 期 8, 页码 3690-3697出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c04375
关键词
Hydrogel; graphene; electrical conductivity; bioelectronics
类别
资金
- Volkswagen Foundation
- German Research Foundation (Deutsche Forschungsgemeinschaft, DFG) [AD183/27-1]
- German Research Foundation [RTG 2154]
- Max Planck School Matter to Life by the German Federal Ministry of Education and Research (BMBF)
- DFG [CRC 1261]
- DFG under Germany's Excellence Strategy [2082/1-390761711]
- BMBF project NanoPatho [FKZ 13N14476]
- European Union's Horizon 2020 research and innovation program [785219, 881603]
The study presents a novel approach to fabricate hydrogel composites with outstanding electrical conductivity by microengineering graphene and polyacrylamide. The method allows for combining excellent conductivity of graphene with adaptable mechanical properties of polyacrylamide, while maintaining the original properties of the matrix. This approach shows promise for applications in bioelectronics and biohybrid robotics.
The fabrication of electrically conductive hydrogels is challenging as the introduction of an electrically conductive filler often changes mechanical hydrogel matrix properties. Here, we present an approach for the preparation of hydrogel composites with outstanding electrical conductivity at extremely low filler loadings (0.34 S m(-1), 0.16 vol %). Exfoliated graphene and polyacrylamide are microengineered to 3D composites such that conductive graphene pathways pervade the hydrogel matrix similar to an artificial nervous system. This makes it possible to combine both the exceptional conductivity of exfoliated graphene and the adaptable mechanical properties of polyacrylamide. The demonstrated approach is highly versatile regarding porosity, filler material, as well as hydrogel system. The important difference to other approaches is that we keep the original properties of the matrix, while ensuring conductivity through graphene-coated microchannels. This novel approach of generating conductive hydrogels is very promising, with particular applications in the fields of bioelectronics and biohybrid robotics.
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