Fabric-substrated capacitive biopotential sensors enhanced by dielectric nanoparticles

Xiangjun Chen; Xiaoxiang Gao; Akihiro Nomoto; Keren Shi; Muyang Lin; Hongjie Hu; Yue Gu; Yangzhi Zhu; Zhuohong Wu; Xue Chen; Xinyu Wang; Baiyan Qi; Sai Zhou; Hong Ding; Sheng Xu

doi:10.1007/s12274-021-3458-0

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Research Article

Fabric-substrated capacitive biopotential sensors enhanced by dielectric nanoparticles

Xiangjun Chen^{¹^,^§}, Xiaoxiang Gao^{²^,^§}, Akihiro Nomoto^{²^,^§}, Keren Shi^¹, Muyang Lin^², Hongjie Hu^¹, Yue Gu^¹, Yangzhi Zhu^², Zhuohong Wu^², Xue Chen^¹, Xinyu Wang^², Baiyan Qi^¹, Sai Zhou^¹, Hong Ding^², Sheng Xu^{¹^,²^,³^,⁴}(

)

1Materials Science and Engineering Program, University of California San Diego, La Jolla, CA 92093, USA

2Department of NanoEngineering, University of California San Diego, La Jolla, CA 92093, USA

3Department of Electrical and Computer Engineering, University of California San Diego, La Jolla, CA 92093, USA

4Department of Bioengineering, University of California San Diego, La Jolla, CA 92093, USA

^§ Xiangjun Chen, Xiaoxiang Gao, and Akihiro Nomoto contributed equally to this work.

Show Author Information

Graphical Abstract

Abstract

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 ~ 100%, and an area ratio as high as ~ 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.

Keywords

capacitive sensing biopotential stretchable calcium copper titanate (CCTO)signal-to-noise ratio (SNR)

Electronic Supplementary Material

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Nano Research

Volume 14 Issue 9,
September 2021

Pages 3248-3252

DOI: 10.1007/s12274-021-3458-0

Cite this article:

Chen X, Gao X, Nomoto A, et al. Fabric-substrated capacitive biopotential sensors enhanced by dielectric nanoparticles. Nano Research, 2021, 14(9): 3248-3252. https://doi.org/10.1007/s12274-021-3458-0

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Received: 06 January 2021

Revised: 17 March 2021

Accepted: 21 March 2021

Published: 15 April 2021