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Ultrathin Multi-functional Graphene-PVDF Layers for Multi-dimensional Touch Interactivity for Flexible Displays

Gao, S; Wu, X; Ma, H; Robertson, J; Nathan, A; (2017) Ultrathin Multi-functional Graphene-PVDF Layers for Multi-dimensional Touch Interactivity for Flexible Displays. ACS Applied Materials and Interfaces , 9 (22) pp. 18410-18416. 10.1021/acsami.7b03437. Green open access

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Abstract

This paper presents a flexible graphene/polyvinylidene difluoride (PVDF)/graphene sandwich for three-dimensional touch interactivity. Here, x-y plane touch is sensed using graphene capacitive elements, while force sensing in the z-direction is by a piezoelectric PVDF/graphene sandwich. By employing different frequency bands for the capacitive- and force-induced electrical signals, the two stimuli are detected simultaneously, achieving three-dimensional touch sensing. Static force sensing and elimination of propagated stress are achieved by augmenting the transient piezo output with the capacitive touch, thus overcoming the intrinsic inability of the piezoelectric material in detecting non-transient force signals and avoiding force touch mis-registration by propagated stress.

Type: Article
Title: Ultrathin Multi-functional Graphene-PVDF Layers for Multi-dimensional Touch Interactivity for Flexible Displays
Open access status: An open access version is available from UCL Discovery
DOI: 10.1021/acsami.7b03437
Publisher version: http://doi.org/10.1021/acsami.7b03437
Language: English
Additional information: © 2017 American Chemical Society. This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Graphene, PVDF, Multi-functional film, Multi-dimensional sensing, Static Force Detection and Propagated Stress Elimination
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1554751
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