期刊
NANO RESEARCH
卷 14, 期 9, 页码 3248-3252出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-021-3458-0
关键词
capacitive sensing; biopotential; stretchable; calcium copper titanate (CCTO); signal-to-noise ratio (SNR)
类别
资金
- Air Force Research Laboratory [FA8650-18-2-5402]
The study introduces a stretchable capacitive sensing device with integrated electrodes and control electronics, improving signal quality and comfort for long-term monitoring of biopotential signals.
Wearable biopotential sensing devices are essential to long-term and real-time monitoring of human health. Non-contact, capacitive sensing electrodes prevent potential skin irritations, and are thus beneficial for long-term monitoring. Existing capacitive electrodes are either connected to a separate control circuit via external wires or have limited sensing capacitances, which leads to low signal qualities. This study demonstrates a stretchable capacitive sensing device with integrated electrodes and control electronics, with enhanced signal qualities. The electrodes and the control electronics are fabricated on a common fabric substrate for breathability and strain-limiting protection. The stretchable electrodes are based on an island-bridge design with a stretchability as high as similar to 100%, and an area ratio as high as similar to 80%. By using a dielectric calcium copper titanate (CCTO) composite as the adhesive layer, the electrode capacitance can be increased, yielding an enhanced signal-to-noise ratio (SNR) in the acquired biopotentials. This device offers a convenient and comfortable approach for long-term non-contact monitoring of biopotential signals.
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