PA1111/BaTiO3 nanocomposites with surprisingly enhanced piezoelectricity at low filler content via in-situ compositing process

High-Performance Piezoelectric Nanogenerator Based on Odd–Odd Nylon Nanofibers for Wearable Electronics via Precise Control of Ferroelectric Phase and Orientation

“…The WAXD patterns in the 2θ range of 5° to 50° are illustrated in Figure S8. Notable diffraction peaks are only observed around 20°, corresponding to the characteristic diffraction peaks of the hydrogen-bond-related crystalline planes of nylon 11,11. − Figure a′–c′ display the deconvolution results of the diffraction peaks, and the corresponding data are listed in Table . For 5-NF and 10-NF, only the characteristic diffraction peak corresponding to the (100) plane of γ-phase of nylon 11,11 is observed (the purple region in Figure a′,b′).…”

“…The mesostable γ crystal structure, usually achieved by rapid cooling crystallization of the melt, such as quenching in ice water or liquid nitrogen bat, serves as the primary piezoelectric crystal structure. After polarization, d 33 of the thin films in γ type can reach 3.9 pC·N – 1 , comparable to that of nylon 11 . Differently from nylon 11, only half of the amide groups in the adjacent chains of nylon 11,11 can form hydrogen bonds, reflecting in its relatively lower glass transition temperature ( T g ) and Brill transition temperature ( T B ). , This difference implies greater chain mobility of nylon 11,11 than nylon 11, which is more conducive to the crystallization process dominated by chain motion and the dipole orientation under an electric field. − This feature indicates the possibility of simultaneously achieving a high-quality active piezoelectric crystal structure while maintaining a high crystallinity, implying superior piezoelectric performance in nylon 11,11-based PENGs.…”

“…After polarization, d 33 of the thin films in γ type can reach 3.9 pC•N −1 , comparable to that of nylon 11. 30 Differently from nylon 11, only half of the amide groups in the adjacent chains of nylon 11,11 can form hydrogen bonds, reflecting in its relatively lower glass transition temperature (T g ) and Brill transition temperature (T B ). 29,31 This difference implies greater chain mobility of nylon 11,11 than nylon 11, which is more conducive to the crystallization process dominated by chain motion and the dipole orientation under an electric field.…”

“…Synthesis of Nylon 11,11.Nylon 11,11 was synthesized through the condensation polymerization of 1,11-undecanedioic amine and 1,11-undecanedioic acid according to our previous work30 and the detailed procedure is described in Supporting Information. The chemical structure of nylon 11,11 was confirmed through1 H NMR and FT-IR spectroscopy, as illustrated in FiguresS1 and S2, respectively.…”

Degradable flexible piezoelectric nanogenerator based on two-dimensional barium titanate nanosheets and polylactic acid

“…[39][40][41][42] Secondly, as the filler concentration increases, agglomeration occurs in the film and increases the stiffness of the composite film and results in less piezoelectric deformation under the same pressure, which limits the dipole motion of PLA and finally weakens the polarisation of the nanocomposite, leading to degradation in the piezoelectric properties. 43,44 As the PNG with a BT content of 6 wt% exhibited the best performance, its electrical properties were further studied. Fig.…”