Abstract:The ceramic–polymer nanocomposites composed of gallium ferrite (GFO) nanoparticles and employing sodium dodecylsulphate (SDS) as surfactant and polyvinylidene fluoride (PVDF) as matrix have been fabricated by solvent casting followed by hot-press technique.
“…Note that the nanoparticle modified by TMPS can form less hydrogen bonds with the polymer matrix than the bare BTO, causing a weaker interfacial interaction. These results corroborate that the interfacial interaction contributed by hydrogen bonding can lead to reduced domain size in the vicinity of the interfacial region [ 32 , 61 , 62 ]. Fig.…”
Ferroelectric polymer nanocomposites possess exceptional electric properties with respect to the two otherwise uniform phases, which is commonly attributed to the critical role of the matrix–particle interfacial region. However, the structure–property correlation of the interface remains unestablished, and thus, the design of ferroelectric polymer nanocomposite has largely relied on the trial-and-error method. Here, a strategy that combines multi-mode scanning probe microscopy-based electrical characterization and nano-infrared spectroscopy is developed to unveil the local structure–property correlation of the interface in ferroelectric polymer nanocomposites. The results show that the type of surface modifiers decorated on the nanoparticles can significantly influence the local polar-phase content and the piezoelectric effect of the polymer matrix surrounding the nanoparticles. The strongly coupled polar-phase content and piezoelectric effect measured directly in the interfacial region as well as the computed bonding energy suggest that the property enhancement originates from the formation of hydrogen bond between the surface modifiers and the ferroelectric polymer. It is also directly detected that the local domain size of the ferroelectric polymer can impact the energy level and distribution of charge traps in the interfacial region and eventually influence the local dielectric strength.
“…Note that the nanoparticle modified by TMPS can form less hydrogen bonds with the polymer matrix than the bare BTO, causing a weaker interfacial interaction. These results corroborate that the interfacial interaction contributed by hydrogen bonding can lead to reduced domain size in the vicinity of the interfacial region [ 32 , 61 , 62 ]. Fig.…”
Ferroelectric polymer nanocomposites possess exceptional electric properties with respect to the two otherwise uniform phases, which is commonly attributed to the critical role of the matrix–particle interfacial region. However, the structure–property correlation of the interface remains unestablished, and thus, the design of ferroelectric polymer nanocomposite has largely relied on the trial-and-error method. Here, a strategy that combines multi-mode scanning probe microscopy-based electrical characterization and nano-infrared spectroscopy is developed to unveil the local structure–property correlation of the interface in ferroelectric polymer nanocomposites. The results show that the type of surface modifiers decorated on the nanoparticles can significantly influence the local polar-phase content and the piezoelectric effect of the polymer matrix surrounding the nanoparticles. The strongly coupled polar-phase content and piezoelectric effect measured directly in the interfacial region as well as the computed bonding energy suggest that the property enhancement originates from the formation of hydrogen bond between the surface modifiers and the ferroelectric polymer. It is also directly detected that the local domain size of the ferroelectric polymer can impact the energy level and distribution of charge traps in the interfacial region and eventually influence the local dielectric strength.
“…Therefore it was expected that the nanoparticles may interact with the positively charged -CH 2 dipoles of PVDF. [7,18] Furthermore, as the inherent electrical properties of filler nanoparticles also affect the output electrical properties of PVDF-based composite films, the measurements of dielectric and ferroelectric properties of the filler materials were also conducted. Figure S7 (Supporting Information) presents the frequency dependent relative dielectric permittivity of all the bulk pellets and their electric field (E) dependent electric displacement (D) loops (ferroelectric hysteresis loops) are presented in Figure S8 (Supporting Information).…”
Section: Characterizations Of Filler Materialsmentioning
Different filler particles are very often used by researchers all over the world to tune the dielectric, ferroelectric, piezoelectric, energy storage, and energy harvesting properties of poly(vinylidene fluoride) (PVDF). In the present work, different perovskite ferrites, AFeO 3 (A = Bi, Er, Ga, La, Sm, and Y), are included into PVDF matrix separately. The roles of different parameters like, particle size, dielectric permittivity, ferroelectric polarization, crystal structure, etc. of the fillers in tuning the performance of respective PVDF-based composites are comprehensively and simultaneously studied here. Non-centrosymmetric fillers are found to improve the output performances of PVDF more effectively compared to that of centrosymmetric fillers. 5 wt% BiFeO 3 -loaded PVDF film (5BF) shows the best performance in all aspects. Upon repeated human finger tapping, the maximum instantaneous output power density and instantaneous current across a 10 MΩ resistor connected across the 5BF film are found to be ≈3 μW cm −2 and 1.25 μA, respectively. The rectified voltage from 5BF nanogenerator is used to charge a 10 μF commercial capacitor up to ≈2.8 V and lights up some LEDs as a part of its real life applicability. The fabricated nanogenerator also shows good vibration and pressure sensing ability.
“…Moreover, there are a few reports where GaFeO 3 has been used as a filler in PVDF. [29][30][31] On the other hand, AlFeO 3 has been comparatively less studied. Moreover, except for one recent report of a PDMS-based piezoelectric nanogenerator, 32 the use of AlFeO 3 in the PVDF matrix has been very rarely explored.…”
The effects of difference in crystal symmetry (R3̄c and Pc21n) and agglomeration of AlFeO3 filler in tuning the electroactive properties and piezo-tribo hybrid energy harvesting performance of PVDF-based composites have been investigated.
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