Flexible piezoelectric energy generators based on P(VDF-TrFE) nanofibers

P(VDF-TrFE) nanofibers: structure of the ferroelectric and paraelectric phases through IR and Raman spectroscopies

“…Electrospinning not only represents an effective method to improve the b phase content in uorinated polymers and copolymers, but it also opens to a wide range of nanostructurebased devices. PVDF [65][66][67][68][69][70][71][72] and P(VDF-TrFE) 9,11,34,[37][38][39]52,53,[73][74][75][76][77][78] nanobers also offer the advantages of electrospinning to develop materials with a macroscopic orientation of the polymer chains.…”

Highly anisotropic and flexible piezoceramic kirigami for preventing joint disorders

“…3C), revealing the enhancement of the piezoelectric anisotropy of the S-HAPNC sensor, which is much higher than that of the anisotropic sensors previously reported (detailed comparison has been summarized in Fig. 3F and table S1) (45)(46)(47)(48)(49)(50).…”

Expedient secondary functions of flexible piezoelectrics for biomedical energy harvesting

“…In addition, biomedical energy harvesters, especially bio-implantable energy harvesters, are required to be biocompatible, which necessitates biocompatible device components including piezoelectric material, electrode, substrate, and encapsulation [ 75 ]. For piezoelectric biomedical energy harvesters, electrode materials have been reported including Cr [ 76 ], Ag [ 77 ], Cu [ 78 ], Au [ 76 ], Al [ 79 ], graphene [ 80 ], and indium tin oxide (ITO) [ 81 ], substrate materials have been reported including plastic films (e.g., polyethylene terephthalate (PET) [ 82 , 83 ], and polyimide(PI) [ 84 ]) and metallic foils (e.g., Ni [ 85 ], Pt [ 86 ], and Ni–Cr alloy [ 87 ]), and encapsulation materials have been reported such as PI [ 84 ], PDMS [ 88 ], and PDMS/Parylene-C [ 89 ]. Initial studies have confirmed their biosafety [ 76 , 89 ], but long-term biocompatibility studies using large animal models or clinical studies are highly desired to conclude on their long-term biocompatibility.…”