Citation: Zhijie Zhao, Xiao Fan, Shuoxuan Wang, Xiaoning Jin, Junjie Li, Yuping Wei, Yong Wang. Natural polymers-enhanced double-network hydrogel as wearable flexible sensor with high mechanical strength and strain sensitivity[J]. Chinese Chemical Letters, ;2023, 34(6): 107892. doi: 10.1016/j.cclet.2022.107892 shu

Natural polymers-enhanced double-network hydrogel as wearable flexible sensor with high mechanical strength and strain sensitivity

Zhijie Zhao ^{a, 1} ,
Xiao Fan ^{a, 1} ,
Shuoxuan Wang ^{a, 1} ,
Xiaoning Jin ^a ,
Junjie Li ^{b, c, *,} ,
Yuping Wei ^{a, c, *,} ,
Yong Wang ^{a, *,}

a.
Department of Chemistry, School of Science, Tianjin University, Tianjin 300350, China
b.
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China
c.
Frontiers Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (Ministry of Education), Tianjin University, Tianjin 300350, China

li41308@tju.edu.cn

ypwei@tju.edu.cn

wangyongtju@tju.edu.cn

Received Date: 22 June 2022
Revised Date: 22 September 2022
Accepted Date: 7 October 2022
Available Online: 12 October 2022

Figures(6)

Conductive hydrogels have shown great prospects as wearable flexible sensors. Nevertheless, it is still a challenge to construct hydrogel-based sensor with great mechanical strength and high strain sensitivity. Herein, an ion-conducting hydrogel was fabricated by introducing gelatin-dialdehyde β-cyclodextrin (Gel-DACD) into polyvinyl alcohol-borax (PVA-borax) hydrogel network. Natural Gel-DACD network acted as mechanical deformation force through non-covalent cross-linking to endow the polyvinyl alcohol-borax/gelatin-dialdehyde β-cyclodextrin hydrogel (PGBCDH) with excellent mechanical stress (1.35 MPa), stretchability (400%), toughness (1.84 MJ/m³) and great fatigue resistance (200% strain for 100 cycles). Surprisingly, PGBCDH displayed good conductivity of 0.31 S/m after adding DACD to hydrogel network. As sensor, it showed rapid response (168 ms), high strain sensitivity (gage factor (GF) = 8.57 in the strain range of 200%-250%) and reliable sensing stability (100% strain for 200 cycles). Importantly, PGBCDH-based sensor can accurately monitor complex body movements (knee, elbow, wrist and finger joints) and large-scale subtle movements (speech, swallow, breath and facial expressions). Thus, PGBCDH shows great potential for human monitoring with high precision.
- Conductive hydrogel,
- Double network,
- Gelatin,
- Dialdehyde β-cyclodextrin,
- Sensor
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