A transparent bending-insensitive pressure sensor digital weight
scale app measuring small normal pressures is essential to
accurately evaluate external stimuli in curvilinear and dynamic
surfaces such as natural tissues. Usually sensitive and spatially
accurate pressure sensors are achieved through conformal contact
with the surface; however this also makes them sensitive to
mechanical deformation (bending). Indeed when a soft object is
pressed by another soft object the normal pressure cannot be
measured independently from the mechanical stress. Here we show a
pressure sensor that measures only the normal pressure even under
extreme bending conditions. To reduce the bending sensitivity we
use composite nanofibres of carbon nanotubes and graphene. Our
simulations show that these fibres change their relative alignment
to accommodate bending deformation thus reducing the strain in
individual fibres. Pressure sensitivity is maintained down to a
bending radius of 80 μm. To test the suitability of our sensor
for soft robotics and medical applications we fabricated an
integrated sensor matrix that is only 2 μm thick. We show
real-time (response time of ∼20 ms) large-area normal pressure
monitoring under different complex bending conditions.
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Digital Weight Scale - Diler.io
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