Epidermis-Like High Performance Wearable Strain Sensor for Full-Range Monitoring of the Human Activities

Madhavan, R (2022) Epidermis-Like High Performance Wearable Strain Sensor for Full-Range Monitoring of the Human Activities. In: Macromolecular Materials and Engineering .

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Abstract

Stretchable strain sensors with outstanding performance are in critical demand with substantial progress in wearable electronic systems. In this work, a graphite conductive network-based active sensor material encapsulated within Ecoflex (sandwich structured Ecoflex/graphite/Ecoflex) is employed for strain and wearable monitoring applications. The typical active sensor material is successfully deposited onto the skin-like Ecoflex stretchable supporting material utilizing a spray coating technique to obtain a highly conductive brittle graphite nanoflake film. As a result, the Ecoflex/graphite/Ecoflex sandwich structured strain sensors exhibit high performance with a large strain sensitivity. Owing to the brittle�stretchable conductive network, the spray-coated strain sensor exhibited high gauge factors of 132 and 32 in the 0�20 and 20�40 strain ranges, respectively. Moreover, this strain sensor demonstrated a quick response speed (150 ms), prominent linearity (R2 > 0.99 in the strain range of 5�20), and high durability (>1000 stretch�release cycles at a large-scale strain of 30) making it attractive for monitoring entire-range of human bodily motions including facial expressions (frowning, eye blinking, and cheek movement), vocal cord vibrations, and human articular joint motions (bending process of a finger, wrist, elbow, and knee), thereby indicating enormous application prospects in healthcare devices, intelligent robotics, and human�computer interfaces. © 2022 Wiley-VCH GmbH.

Item Type:	Journal Article
Publication:	Macromolecular Materials and Engineering
Publisher:	John Wiley and Sons Inc
Additional Information:	The copyright for this article belongs to John Wiley and Sons Inc
Keywords:	Eye movements; Graphite; Joints (anatomy); Wearable sensors, Active sensor; Conductive networks; EcoFLEX; Human motion detection; Performance; Sensor materials; Strain monitoring; Strain ranges; Strain sensors; Stretchable strain sensor, Motion analysis
Department/Centre:	Division of Mechanical Sciences > Chemical Engineering
Date Deposited:	19 May 2022 06:00
Last Modified:	19 May 2022 06:00
URI:	https://eprints.iisc.ac.in/id/eprint/72022

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