Ultrathin Multifunctional Graphene-PVDF Layers for Multidimensional Touch Interactivity for Flexible Displays

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...

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Bibliographic Details
Published inACS applied materials & interfaces Vol. 9; no. 22; pp. 18410 - 18416
Main Authors Gao, Shuo, Wu, Xingyi, Ma, Hanbin, Robertson, John, Nathan, Arokia
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 07.06.2017
Subjects
multifunctional film
multidimensional sensing
PVDF
static force detection and propagated stress elimination
graphene
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Summary: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 nontransient force signals and avoiding force touch mis-registration by propagated stress.
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ISSN:1944-8244
1944-8252
DOI:10.1021/acsami.7b03437