湿度
材料科学
石墨烯
单宁酸
相对湿度
灵敏度(控制系统)
复合材料
纳米技术
光电子学
电子工程
化学
气象学
物理
工程类
有机化学
作者
Hanqing Fang,Dahu Yao,Xiping Gao,Yunjuan Sun,A Shiwei,Min Lü,Chunmei Lu
标识
DOI:10.1016/j.sna.2023.114213
摘要
It is still a challenge for multi-functional flexible sensors to simultaneously improve the sensitivity to different external stimuli. Here, we construct vertical graphene arrays on the surface of a natural latex film with good stretchability. Then, the graphene was modified by tannic acid to endow it hydrophilicity. The modification of tannic acid not only improved the humidity sensing ability of the sensor, but also greatly improved its sensitivity to strain response. The strain response sensitivity was increased from 24.0 to 858.7 at 50 % strain, and the lower detection limit was also increased to 0.1 %. The sensor also showed good response stability in the cyclic strain test in 2000. The excellent strain response behavior enables the sensor to detect human joint motion and emotional fluctuations. The modification of tannic acid improved the hydrophilicity of graphene and made the sensor have good humidity response ability. The modified sensor has humidity sensing capability in the range of 0–100 % humidity. The sensor can detect 0.5 % humidity change in dry environment and 2 % humidity change in high humidity environment. The high sensitivity to humidity also allows the sensor to detect the movement of wet objects in a non-contact manner. The research results show that the sensor has potential applications in wearable devices, electronic skin, intelligent artificial limbs and other fields.
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