[Chemical Engineering Journal]Intrinsically Adhesive, Highly Sensitive and Temperature Tolerant Flexible Sensors Based on Double Network Organohydrogels
作者：Hongwei Zhou,* Jialiang Lai, Xilang Jin, Hanbin Liu, Xusheng Li, Weixing Chen, Aijie Ma, Xuechang Zh
關(guān)鍵字：Intrinsic adhesion; organohydrogel; flexible sensor; high sensitivity; temperature tolerance
論文來源：期刊
具體來源：Chemical Engineering Journal
發(fā)表時(shí)間：2020年
Hydrogel-based flexible sensors are of promising applications in various fields, but fabrication of such sensors with integrated high performances remains a challenge. In this work, flexible sensors (both strain sensors and pressure sensors) with integrated high performances are fabricated utilizing double network (DN) organohydrogels. Because of the unique structure of DN organohydrogels, the flexible sensors exhibit intrinsic adhesion without introducing components that are often used to obtain adhesive hydrogels, such as polydopamine, nucleobases or proteins. In addition, outstanding temperature tolerance (?18 to 80 °C), high stretchability (>2000%), tensile strength (>300 kPa), self-healing ability (96.5%) and transparency (90%) are also achieved. Resistive-type strain sensors of DN organohydrogels achieve high gauge factor (GF = 2.58), low response time (0.18 s), large sensing range (0–1000%) and reversible sensing ability (>1000 cycles). Sandwich-shaped capacitive-type pressure sensors comprising DN organohydrogel electrodes with reliefs exhibit a high sensitivity of 2.14 kPa?1. Such flexible sensors can be applied in monitoring various human motions and subtle physiological activities and further promoted as wireless sensors on the basis of a Bluetooth protocol.