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Non-wrinkled, highly stretchable piezoelectric devices by electrohydrodynamic direct-writing†

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C3NR06007A.pdf

abstract:

Piezoelectric structures, in forms that allow mere in-surface deformations under large strains, are attractive
for bio-integrated systems. Here, mechano-electrospinning (MES) is presented to direct-write straight
nanofibers of polyvinylidene fluoride onto a prestrained poly(dimethylsiloxane) (PDMS) substrate, to
position and polarize a piezoelectric nanofiber array in one-step. Wrinkled/non-wrinkled buckling modes
are found when the substrates are released, and the morphology of the direct-written fiber proved the
key to determine the buckling modes, which can be tuned precisely by MES parameters. The nonwrinkled,
stretchable piezoelectric devices with a highly synchronized serpentine fiber array exhibit their
in-surface deformation and stable piezoelectric performance up the failure strain of PDMS (110% in our
study), which may be used as stretchable sensors and energy converters/providers.

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