Highly Conductive and Mechanically Robust Cellulose Nanocomposite Hydrogels with Antifreezing and Antidehydration Performances for Flexible Humidity Sensors

• DOI: 10.1021/acsami.2c00513
• Publication Date: 2022-02-18T16:35:15Z
• Authors: Jie Yu; Yufan Feng; Dan Sun; Wenfeng Ren; Changyou Shao; Runcang Sun
• Keywords: 01 natural sciences; 0104 chemical sciences

Conductive hydrogels are emerging as an appealing material platform for flexible electronic devices owing to their attractive mechanical flexibility and conductive properties. However, the conventional water-based tend inevitably freeze at subzero temperature suffer from continuous water evaporation under ambient conditions, leading a decrease in electrical conductivities Thus, it is extremely necessary, but generally challenging, create antifreezing antidehydration gel maintaining high stable performances terms of conductivity Herein, we fabricated cellulose nanofibril (CNF)-reinforced highly ion-conductive organogel featuring excellent by immersing CaCl2/sorbitol solution solvent displacement. The incorporation rigid CNF serving dynamic connected bridge provided hierarchical honeycomb-like cellular structure obtained CS-nanocomposite (NC) networks, facilitating significant reinforcement. synergy effects sorbitol CaCl2 allowed high-performance integration with tolerance, ability, ionic conductivity. Strong hydrogen bonds were formed between molecules impede formation ice crystals evaporation, thereby imparting CS-NC organogels extreme-temperature tolerance low -50 °C pre-eminent performance over 90% weight retention. Furthermore, this exhibited humidity sensitivity wide detection range (23∼97% relative humidity) because ready numerous hydrophilic groups binary elaborated polymer chains, which can be assembled stretchable sensor monitor human respiration fast response. This work provides new prospect fabricating intrinsically sensors using cellulose-based humidity-responsive materials wearable applications.