Self-powered sensing elements based on direct-write, highly flexible piezoelectric polymeric nano/microfibers

Monitoring of Vital Signs with Flexible and Wearable Medical Devices

“…Piezoelectric materials generate electricity in response to a pressure signal; most common among them is the highperforming but brittle piezoelectric material lead zirconate titanate (PZT). [ 188 ] Flexible piezoelectric nanogenerators have recently been developed based on more fl exible forms of PZT such as thin ribbons [ 189 ] or nanowires, [ 190 ] as well as lead-free materials such as PVDF, [ 145,165,[191][192][193] ZnO nanowires, [ 194 ] and cellular polypropylene. [ 75 ] Triboelectric generators, on the other hand, generate electricity from the transfer of surface charge that occurs when certain materials, including many common metals and polymers, are brought into contact, [ 144 ] either by pressing and releasing [ 195 ] or sliding.…”

Biodegradable, electro-active chitin nanofiber films for flexible piezoelectric transducers

“…Thus, it is necessary to explore new, soft-type piezoelectric materials for satisfying the pliable requirements of soft electronics. [7][8] Among them, fluorine-based polymer such as poly(vinylidene fluoride) (PVDF) [9][10][11] , poly(vinylidene fluoride-co-trifluoroethylene) (PVDF-TrFE) [12][13] and poly(vinylidene fluoride-co-trifluoroethlyene-co-chlorotrifluoro ethylene) (PVDF-TrFE-CTFE) 14 , have attracted great interest as flexible piezoelectric materials because they are strongly polarized under pressure due to the negatively charged fluorine atoms and positively charged hydrogen atoms in the chain backbones of these polymers. The piezoelectric output responses of these piezoelectric fluorine-based polymers have been developed by crystal orientation control 15 , blending with inorganic piezoelectric materials and conductive carbon 16 , and electrospinning fiber alignment.…”

Ferroelectric polymer nanopillar arrays on flexible substrates by reverse nanoimprint lithography

“…[9][10][11][12] With the increasing application of ferroelectric polymers in the area of flexible electronics, [13][14][15][16] high-throughput and low-cost fabrication of uniform ferroelectric polymer nanostructures with good ferroelectric properties over large areas on flexible substrates will be a significant basis for flexible electronics applications. Previous studies of ferroelectric polymers, like polyvinylidene-co-trifluoroethylene, P(VDF-TrFE), report results from conventional nanoimprint lithography (NIL) with highcost rigid molds at high pressures ranging from 20 bar to 120 bar and 130 to 150 1C to produce ferroelectric nanostructures on hard substrates.…”