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Issue 4, 2019
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An ultra-stretchable, highly sensitive and biocompatible capacitive strain sensor from an ionic nanocomposite for on-skin monitoring

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Abstract

Flexible strain sensors that can be comfortably attached onto the skin for real-time and accurate detection of physiological signals are particularly important for the realization of healthcare, soft robotics and human–machine interfacing. It is still challenging to develop strain sensors that satisfy both high stretchability and high sensitivity. Here, we demonstrate an ultra-stretchable, highly sensitive and biocompatible capacitive-type strain sensor based on a nanocomposite containing ionic hydrogels and silver nanofibers (AgNFs). The sensor exhibits an ultra-high stretchability of 1000% and high sensitivity with a maximum gauge factor (GF) of up to 165. We find that the incorporation of AgNFs greatly increases the electrical-double layer (EDL) area at the hydrogel/metal interface and hence enhances by 3 orders of magnitude the strain sensitivity. With a short response time and good operation stability, the sensor and its matrix were successfully applied to monitor various physiological signals such as arm and finger motions, pulse, electrocardiographs (ECG), breath, speaking and emotion changes.

Graphical abstract: An ultra-stretchable, highly sensitive and biocompatible capacitive strain sensor from an ionic nanocomposite for on-skin monitoring

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Publication details

The article was received on 24 Oct 2018, accepted on 31 Dec 2018 and first published on 03 Jan 2019


Article type: Communication
DOI: 10.1039/C8NR08589G
Citation: Nanoscale, 2019,11, 1570-1578
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    An ultra-stretchable, highly sensitive and biocompatible capacitive strain sensor from an ionic nanocomposite for on-skin monitoring

    H. Xu, Y. Lv, D. Qiu, Y. Zhou, H. Zeng and Y. Chu, Nanoscale, 2019, 11, 1570
    DOI: 10.1039/C8NR08589G

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