CNT@leather-based electronic bidirectional pressure sensor
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T@leather-based electronic bidirectional pressure sensor †
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CHEN YuanYuan , XIE RuiJie , ZOU BingHua, LIU YiHan, ZHANG Kang, LI Sheng, * * ZHENG Bing, ZHANG WeiNa, WU JianSheng & HUO FengWei Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), Nanjing 211816, China Received October 22, 2019; accepted December 12, 2019; published online August 17, 2020
The ability of perceiving external pressures and conducting corresponding signals is one of the important functions of flexible electronics, which has been widely studied in electronic skin, prosthetics, robotics, healthcare, human-machine interfaces, etc. Pressure sensor should not be limited to the detection of unidirectional pressure. Here, a leather-based electronic pressure sensor and corresponding arrays with bidirectional sensing capability are demonstrated. The sensor/arrays consisting of two pieces of stacked leather both modified with acidified carbon nanotubes (a-CNTs) can achieve multi-level response to pressure over a broad working range and sense pulling force opposite to pressure. With polyurethane mixed with ferriferrous oxide (Fe3O4) powder being applied to their upper surface, the resistive sensor/individual units of arrays can also detect the magnetic field because of the contactless pulling force generated by the magnetized Fe3O4. Being able to sense pressure, pulling force and magnetic field, the leather-based electronic bidirectional pressure sensor and corresponding arrays with good performance not only exhibit potential for mass production and their broad application prospects, but also provide a new insight for the development of flexible electronics. flexible electronics, leather, bidirectional detection, pressing/pulling force, magnetic field sensing Citation:
Chen Y Y, Xie R J, Zou B H, et al. CNT@leather-based electronic bidirectional pressure sensor. Sci China Tech Sci, 2020, 63, https://doi.org/ 10.1007/s11431-019-1502-7
1 Introduction Flexibility has gradually become a trend in the development of electronic devices as traditional rigid and fragile substrate materials for sensors including semiconductor wafer and glass go against the realization of wearability and portability [1–3]. As a common flexible electronic device [4–6], electronic skin (e-skin) that simulates functions of human skin should realize pressure sensing [7,8], tension sensing [9,10], temperature sensing [11,12], etc. It is remarkable that pressure sensor as an important component of flexible electronics has been widely studied in prosthetics [13], robotics [14–16], †
These authors contributed equally to this work. *Corresponding authors (email: [email protected]; [email protected])
healthcare [17,18], human-machine interfaces [19–21], etc. Among various flexible pressure sensors [22–26], flexible resistive pressure sensor, capable of detecting pressure through transferring varied contact of conductive microstructures into resistance change, is of particular interest to researchers
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