Wearable multifunctional printed graphene sensors

Altynay Kaidarova, Mohammed Asadullah Khan, Marco Marengo, Liam Swanepoel, Alexander Przybysz, Cobus Muller, Andreas Fahlman, Ulrich Buttner, Nathan Geraldi, Rory P. Wilson, Carlos M. Duarte, Jürgen Kosel

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

The outstanding properties of graphene have initiated myriads of research and development; yet, its economic impact is hampered by the difficulties encountered in production and practical application. Recently discovered laser-induced graphene is generated by a simple printing process on flexible and lightweight polyimide films. Exploiting the electrical features and mechanical pliability of LIG on polyimide, we developed wearable resistive bending sensors that pave the way for many cost-effective measurement systems. The versatile sensors we describe can be utilized in a wide range of configurations, including measurement of force, deflection, and curvature. The deflection induced by different forces and speeds is effectively sensed through a resistance measurement, exploiting the piezoresistance of the printed graphene electrodes. The LIG sensors possess an outstanding range for strain measurements reaching >10% A double-sided electrode concept was developed by printing the same electrodes on both sides of the film and employing difference measurements. This provided a large bidirectional bending response combined with temperature compensation. Versatility in geometry and a simple fabrication process enable the detection of a wide range of flow speeds, forces, and deflections. The sensor response can be easily tuned by geometrical parameters of the bending sensors and the LIG electrodes. As a wearable device, LIG bending sensors were used for tracking body movements. For underwater operation, PDMS-coated LIG bending sensors were integrated with ultra-low power aquatic tags and utilized in underwater animal speed monitoring applications, and a recording of the surface current velocity on a coral reef in the Red Sea.
Original languageEnglish (US)
Journalnpj Flexible Electronics
Volume3
Issue number1
DOIs
StatePublished - Aug 2 2019

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