Temperature‐Stress Bimodal Sensing Conductive Hydrogel‐Liquid Metal by Facile Synthesis for Smart Wearable Sensor. Issue 1 (9th November 2021)

• Record Type: Journal Article
• Authors: Wang, Chen; Li, Jie; Fang, Zhaozhou; Hu, Zhirui; Wei, Xiaotong; Cao, Yang; Han, Jing; Li, Yingchun
• Is Part Of: Macromolecular rapid communications. Volume 43:Issue 1(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-11-09
• Subjects: bimodal sensing -- conductive hydrogel -- liquid metal -- multiple sensations -- smart wearable sensor; Macromolecules -- Periodicals; Polymers -- Periodicals; Chemistry -- Periodicals; 547.705
• DOI: 10.1002/marc.202100543
• Languages: English
• ISSNs: 1022-1336

Abstract

Abstract: Conductive hydrogels have attracted great attention due to their promising applications in wearable sensors. However, developing conductive hydrogels with excellent sensor properties and multiple stimuli responsiveness for smart wearable devices is still a challenge. This paper presents a facile synthetic method of a crosslinked chitosan quaternary ammonium salt and liquid metal (CHACC‐LM) composite hydrogel with temperature–stress bimodal sensing for smart wearable sensor. LM as liquid fillers toughen the hydrogel matrix (stress: 1.11 MPa) and enhance the hydrogel extensibility (strain: 233%). The CHACC‐LM hydrogel exhibits conductivity, excellent antibacterial properties (> 99%), an electrical self‐healing property, and strain sensitivity (GF = 1.6). In addition, the CHACC‐LM hydrogel can be used as wearable flexible sensors with the ability of monitoring human activities directly and the distinguished ability of discerning subtle motions (handwriting). It also shows sensitivity in the external environment such as low temperature, thermal response, and water solution. Importantly, the composite hydrogel simultaneous response to different stress and temperature stimuli. Furthermore, the CHACC‐LM hydrogel can be used for gesture recognition and to control the manipulator in human–computer interaction. All these properties provide a great scope for researchers to achieve practical advances in smart wearable sensors. Abstract : A facile synthetic method of a smart wearable sensor based on biomass‐based chitosan quaternary ammonium salt‐liquid metal (CHACC‐LM). Owing to the synergistic effect of LM and positive charge in the network, the composite hydrogel has excellent antibacterial properties. Smart wearable sensors constructed by CHACC‐LM hydrogel has multiple sensations properties and exhibited temperature–stress bimodal sensing.