graphene tribotronics for electronic skin and touch screen ...€¦ · a b working mechanism...
TRANSCRIPT
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Research Results
Graphene Tribotronics for Electronic Skin and
Touch Screen Applications
Adv. Mater., 29, 1603544 (2017)
selected as a back cover
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Graphene tribotronics for electronic skin and touch screen
applications
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Device structure
Monolayer graphene
Planar coupling
PDMS : friction layer
Ion gel : gate dielectric
ITO : bottom gate electrode
Graphene tribotronics for electronic skin and touch screen
applications
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a b
Working Mechanism
Cations migrate to the ITO-graphene interface in order
to screen the negative charges
Anions migrate to the graphene-ion gel interface and
accumulate holes in the graphene channel
Positive potential is applied to the ion gel dielectric
Electrons are accumulated in the graphene channel
Graphene tribotronics for electronic skin and touch screen
applications
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Release
Touch
Touch
Release
- Nylon - PTFE
Touch Response
Touch
Release
- Al
with a force of 2.9 N
Vds = 0.5 V
Graphene Tribotronics for Touch Screen Applications
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Touch Response and Stability
Tribotronic touch sensor can detect touch stimuli as low as < 1 kPa
Saturation in the current modulation at pressures in excess of ≈ 20 kPa is due to saturation in
the triboelectric charges
Graphene tribotronics for electronic skin and touch screen
applications
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Sensor Array
Graphene tribotronics for electronic skin and touch screen
applications