PVA/SA/MXene dual‐network conductive hydrogel for wearable sensor to monitor human motions

Abstract

Conductive hydrogels with high flexibility, superior formability, good mechanical elasticity, and excellent biocompatibility have emerged as promising materials for broad applications in flexible/wearable electronic devices. In this work, a conductive dual-network PVA/SA/MXene hydrogel (PSM-h) composed of polyvinyl alcohol, sodium alginate, and MXene (Ti 3 C 2 T x ) is constructed by a green method without using chemical crosslinking agents. The resultant hydrogel with dual-network feature shows excellent cytocompatibility (no toxicity for human umbilical cord mesenchymal stem cells), high stretchability (up to 263%), and superior anti-fatigue ability (stretched up to 1000 cycles). More importantly, PSM-h based strain sensor presents good sensing sensitivity with a fast response time (62.5 ms) and a low detection limit even under a very slight strain of 0.2%. In terms of the practical application, the PSM-h based strain sensor can be applied to detect and distinguish various human motions.

A novel study on the sandwich‐structure strain sensor using ethylene‐vinyl acetate‐based hot‐melt adhesive mesh web: Fabrication, properties, and modeling

“…EVA based hot-melt adhesive mesh web (EVA-HAW) with a density of 38 g/m 2 was purchased from Pinghu Zhanpeng Hot Melt Adhesive Web & Film Co., Ltd., China. The CNTs (C139882, inner diameter 5-15 nm, outer diameter > 50 nm, length 10-20 μm, density 1.7-1.9 g/cm 3 ) was obtained from Shanghai Aladdin Biochemical Technology Co., Ltd., China. Polyimide membranes with a thickness of 0.05 mm was purchased from HUDEN Hardware Co., Ltd., China.…”

“…Flexible conductive polymeric composites (FCPCs) are commonly applied as flexible strain sensors 1,2 due to their flexibility and high electrical conductivity, which enable FCPCs to monitor electrical signals in real‐time continuously 3,4 . Thus, they are used in a wide range of applications such as electronic skin, healthcare, and sports equipment 5 .…”

Fabrication of conductive and superhydrophobic poly(lactic acid) nonwoven fabric for human motion detection

“…With the rapid development of emerging industries such as touchable displays, 1 electronic skins, 2 intelligent robotics, 3 and wearable devices, 4 sensors as the most important components have been paid enormous attention. According to the difference of function, pressure sensors can be divided into piezoresistive pressure sensor, 5,6 capacitive pressure sensor, 7 and piezoelectric pressure sensor 8 .…”

Stretchable, conductive poly(acrylamide‐co‐maleic acid)/triethylene glycol/NaCl double‐crosslinked organohydrogel with excellent antifreezing and sensing properties

“…Recently, the hydrogel with excellent conductivity and tunable mechanical properties have been widely used to fabricate various sensing elements 13–19 . However, hydrogel contained plenty of water, which can be easily frozen at the temperature below 0°C resulting to the loss of flexibility and sharply decline of conductivity largely limited the applications in low temperature 20–23 .…”

“…12 Recently, the hydrogel with excellent conductivity and tunable mechanical properties have been widely used to fabricate various sensing elements. [13][14][15][16][17][18][19] However, hydrogel contained plenty of water, which can be easily frozen at the temperature below 0 C resulting to the loss of flexibility and sharply decline of conductivity largely limited the applications in low temperature. [20][21][22][23] To solve the aforementioned problem, organic solvents or inorganic salts were introduced to the networks to endow the hydrogel with the extraordinary freezing resistance.…”