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3D printed highly flexible strain sensor based on TPU-Graphene composite for feedback of high speed robotic applications

Abstract

A novel, highly flexible and electrically resistive-type strain sensor with special three-dimensional conductive network is 3D printed by using the composite of conductive graphene pallets and flexible thermoplastic polyurethane (TPU) pallets. The morphology of TPU graphene filament is verified by Raman Spectrum. The composite filament is exceptionally fused with each other and constructed an excellent three-dimensional conductive network. The size of 3D printed strain sensor is 2x1.5cm (Length x Width) and layer depth of 200 micro meter(µm). The special hierarchical conductive network endowed our 3D printed strain sensor with a desirable integration of good stretchability and high sensitivity (gauge factor (GF) of 11 in strain of 10% and 80 in strain of 100% in reversible strain regime), good durability and stability (stretch/release test of 6000 cycles) and a fast response speed. The mechanism of the evolution of residual resistance and residual strain of 3D printed strain sensor under cyclic loading were investigated in detail. The strain sensor is embedded inside a 3D printed PLA based finger hinge and bending feedback is observed. The results demonstrate that our flexible strain sensor has wide application prospects in soft actuator, feedback from high speed robotic applications and 3D printed wearable devices.

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Publication details

The article was received on 11 Jul 2018, accepted on 15 Jan 2019 and first published on 23 Jan 2019


Article type: Paper
DOI: 10.1039/C8TC03423K
Citation: J. Mater. Chem. C, 2019, Accepted Manuscript

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    3D printed highly flexible strain sensor based on TPU-Graphene composite for feedback of high speed robotic applications

    J. Z. Gul, M. Sajid and K. H. Choi, J. Mater. Chem. C, 2019, Accepted Manuscript , DOI: 10.1039/C8TC03423K

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