Nanocellulose-templated carbon nanotube enhanced conductive organohydrogel for highly-sensitive strain and temperature sensors

文献类型： 外文期刊

第一作者： Wei, Yuan

作者： Wei, Yuan;Qian, Yangyang;Zhu, Penghui;Xiang, Lijing;Lei, Chunfa;Qiu, Ge;Wang, Chunyu;Liu, Yikang;Chen, Gang;Liu, Yijun;Chen, Gang

作者机构：

关键词： Electronic conductive hydrogel; Low modulus; Environmental stability; Strain and temperature sensors

期刊名称：CELLULOSE （ 影响因子：6.123； 五年影响因子：6.004 ）

ISSN： 0969-0239

年卷期： 2022 年 29 卷 7 期

页码：

收录情况： SCI

摘要： Conductive hydrogels have garnered wide interest for various promising applications, such as wearable devices, electronic skins, and intelligent robots. However, these hydrogels still suffer from weak mechanical properties, poor environmental stability, and low sensitivity. Here, we report a conductive organohydrogel that is easily synthesized by a one-step acrylamide polymerization in the presence of cellulose nanofiber (CNF)-templated carbon nanotube (CNT) hybrids and glycerol-water binary solvent. The uniformly dispersed CNF/CNT nanohybrids act as a reinforced and conductive skeleton, which synergistically endows the organohydrogel with excellent tensile strength (approximate to 119.2 kPa) and high electronic conductivity (approximate to 2.7 mS-cm(-1)). Moreover, the synergy of glycerol-water solvent network and polyacrylamide (PAAm) polymer matrix provides an ultra-stretchability (up to 1343%) and skin-like modulus (approximate to 17.7 kPa), which can well match the dynamic human-machine interface. Furthermore, the organohydrogels exhibit excellent flexibility under an extreme temperature (< - 24 degrees C) and maintain the long-term water-retention capability in an open environment (> 10 days), owing to the glycerolenhanced H-bonding interface interactions. Benefiting from these high performances, our organohydrogel can be employed for preparing multifunctional sensing devices, which display high sensitivity to external strains (gauge factor = 10.03) and dynamic temperature changes (temperature coefficient of resistance = - 1.081% degrees C-1), superior to the most reported samples. Our results pave the way for simple and practical systems that fulfill the requirements of intelligent electronic devices.

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