Abstract
For advanced conductive hydrogels,adaptable mechanical properties and high conductivity are essential requirements for practical application,e.g.,soft electronic devices.Here,a straightforward strategy to de-velop a mechanically robust hydrogel with high conductivity by constructing complicated 3D structures composed of covalently cross-linked polymer network and two nanofillers with distinguishing dimensions is reported.The combination of one-dimensional quaternized cellulose nanofibrils(QACNF)and two-dimensional MXene nanosheets not only provides prominent and tunable mechanical properties modu-lated by materials composition,but results in electronically conductive path with high conductivity(1281 mS m-1).Owing to the uniform interconnectivity of network structure attributed to the strong macro-molecular interaction and nano-reinforced effect,the resultant hydrogel exhibits a balanced mechanical feature,i.e.,high tensile strength(449 kPa),remarkable stretchability(＞1700％),and ultra-high tough-ness(5.46 MJ m-3),outperforming those of virgin one.Additionally,the enhanced conductive characteris-tic with the aid of QACNF enables hydrogels with impressive electromechanical behavior,containing high sensitivity(maximum gauge factor:2.24),wide working range(0-1465％),and fast response performance(response time:141 ms,recover time:140 ms).Benefiting from the excellent mechanical performance,a flexible strain sensor based on such conductive hydrogel can deliver an appealing sensing performance of monitoring multi-scale deformations,from large and monotonous mechanical deformation to tiny and complex physiological motions(e.g.,joint movement and signature/vocal recognition).Together,the hy-drogel material in this work opens up opportunities in the design and fabrication of advanced gel-based materials for emerging wearable electronics.
基金项目
National Natural Science Foundation of China(52203148)
National Natural Science Foundation of China(51973047)
National Natural Science Foundation of China(12002113)
Research Foundation of Talented Scholars of Zhejiang A & F University(2020FR070)
Research Foundation of Talented Scholars of Zhejiang A & F University(2021FR024)
Zhejiang A&F University Scientific Research Training Program for Undergraduates(S202210341186)
Key Research and Development Program of Shaanxi(2022-JBGS3-09)
NETL
NSTL
万方数据