石墨烯
标度系数
材料科学
纳米技术
应变计
复合数
涂层
氧化物
复合材料
制作
冶金
替代医学
医学
病理
作者
Jin Wu,Wenxi Huang,Zixuan Wu,Xing Yang,Ajay Giri Prakash Kottapalli,Xi Xie,Yubin Zhou,Kai Tao
出处
期刊:ACS materials letters
[American Chemical Society]
日期:2022-07-27
卷期号:4 (9): 1616-1629
被引量:64
标识
DOI:10.1021/acsmaterialslett.2c00230
摘要
Developing stretchable/wearable strain sensors in different application scenarios is a global demand for creating a smart society and promoting healthcare, whereas existing hydrogel-based strain sensors suffer from limited sensitivity, low conductance and hydrophilicity, making them difficult to operate underwater. In this work, a highly sensitive, stretchable, and hydrophobic strain sensor is fabricated by coating a layer of reduced graphene oxide (rGO) sheets on the surface of organohydrogel. Furthermore, a facile solvent-replacement approach is utilized to enhance the anti-freezing and anti-drying abilities of hydrogel simultaneously by incorporating propanediol in the solvent. Consequently, the obtained rGO-organohydrogel composite strain sensor features a high gauge factor of 140, a low detection limit of 0.1% strain, a wide detection range (0–400% strain), a fast response time of 190 ms, excellent stability and repeatability, and high hydrophobicity (contact angle of 122°), making it applicable for a wide range of application scenarios, such as the real-time and continuous monitoring of various human motions in extremely cold (−60 °C), dry, and underwater environments. The sensitivity of an rGO-modified organohydrogel strain sensor is more than 30 times higher than that of its unmodified counterpart, which is attributed to the cracking and tunneling effects introduced by the highly conductive rGO surface layer upon stretching.
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