Sensitive, high-strain, high-rate bodily motion sensors based on graphene-rubber composites

Boland, Conor S, Khan, Umar, Backes, Claudia, O'Neill, Arlene, McCauley, Joe, Duane, Shane, Shanker, Ravi, Jurewicz, Izabela, Dalton, Alan B and Coleman, Jonathan N (2014) Sensitive, high-strain, high-rate bodily motion sensors based on graphene-rubber composites. ACS Nano, 8 (9). pp. 8819-8830. ISSN 1936-0851

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Abstract

Monitoring of human bodily motion requires wearable sensors that can detect position, velocity and acceleration. They should be cheap, lightweight, mechanically compliant and display reasonable sensitivity at high strains and strain rates. No reported material has simultaneously demonstrated all the above requirements. Here we describe a simple method to infuse liquid-exfoliated graphene into natural rubber to create conducting composites. These materials are excellent strain sensors displaying 104-fold increases in resistance and working at strains exceeding 800%. The sensitivity is reasonably high, with gauge factors of up to 35 observed. More importantly, these sensors can effectively track dynamic strain, working well at vibration frequencies of at least 160 Hz. At 60 Hz, we could monitor strains of at least 6% at strain rates exceeding 6000%/s. We have used these composites as bodily motion sensors, effectively monitoring joint and muscle motion as well and breathing and pulse.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups: Materials Physics Group
Subjects: Q Science
Depositing User: Alan Dalton
Date Deposited: 19 Jan 2018 12:29
Last Modified: 19 Jan 2018 12:29
URI: http://sro.sussex.ac.uk/id/eprint/72986

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