Structural Insight in the Interfacial Effect in Ferroelectric Polymer Nanocomposites

Liu, Yang; Yang, Tiannan; Zhang, Bing; Williams, Teague; Lin, Yen‐Ting; Li, Li; Zhou, Yao; Lu, Wenchang; Kim, Seong H.; Chen, Lei; Bernholc, J.; Wang, Qing

doi:10.1002/adma.202005431

Cited by 98 publications

(55 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Based on the overall data, we can conclude that by increasing the Ag-BT hybrid filler addition in the composites, the formation of the polar structure β and γ phases of PVDF is promoted, although the major phase remains the α-polymorph. An increase of the electroactive β and γ phases of PVDF as induced by the presence of silver inclusions was also reported in recent literature [ 43 , 44 ]. A detailed nanoscale experimental study combined with DFT calculations demonstrated that the mechanism favoring the formation of polar phases resulted from a polar interfacial coupling between the filler and the molecular chains of the polymer promoting specific polar arrangements, i.e., the presence of electroactive phases [ 44 ].…”

Section: Resultssupporting

confidence: 67%

“…An increase of the electroactive β and γ phases of PVDF as induced by the presence of silver inclusions was also reported in recent literature [43,44]. A detailed nanoscale experimental study combined with DFT calculations demonstrated that the mechanism favoring the formation of polar phases resulted from a polar interfacial coupling between the filler and the molecular chains of the polymer promoting specific polar arrangements, i.e., the presence of electroactive phases [44]. The structural modifications induced by the presence of an inorganic hybrid filler are expected to support a permittivity increase and in general, to enhance ferro-, pyro-, and piezoelectric responses in the flexible composites concerning the characteristics of the pure PVDF material.…”

Section: Phase Composition Analyzed By X-ray Diffraction and Infrared...supporting

confidence: 68%

“…The dielectric, ferroelectric, and piezoelectric properties are enhanced by the conformations with a larger dipole moment, i.e., in the electroactive phases β and γ. The phase composition was observed to be sensitive to the processing strategy and parameters, to co-polymerisation [ 41 , 42 ], or by nanofiller additions [ 43 , 44 ].…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Increasing Permittivity and Mechanical Harvesting Response of PVDF-Based Flexible Composites by Using Ag Nanoparticles onto BaTiO3 Nanofillers

et al. 2022

View full text Add to dashboard Cite

The role of Ag addition on the structural, dielectric, and mechanical harvesting response of 20%(xAg-(1-x)BaTiO3)-80%PVDF (x = 0, 2, 5, 7 and 27 vol.%) flexible composites is investigated. The inorganic fillers were realized by precipitating fine (~3 nm) silver nanoparticles onto BaTiO3 nanoparticles (~60 nm average size). The hybrid admixtures with a total filling factor of 20 vol.% were embedded into the PVDF matrix. The presence of filler enhances the amount of β-PVDF polar phase and the BaTiO3 filler induces an increase of the permittivity from 11 to 18 (1 kHz) in the flexible composites. The addition of increasing amounts of Ag is further beneficial for permittivity increase; with the maximum amount (x = 27 vol.%), permittivity is three times larger than in pure PVDF (εr~33 at 1 kHz) with a similar level of tangent losses. This result is due to the local field enhancement in the regions close to the filler-PVDF interfaces which are additionally intensified by the presence of silver nanoparticles. The metallic addition is also beneficial for the mechanical harvesting ability of such composites: the amplitude of the maximum piezoelectric-triboelectric combined output collected in open circuit conditions increases from 0.2 V/cm2 (PVDF) to 30 V/cm2 for x = 27 vol.% Ag in a capacitive configuration. The role of ferroelectric and metallic nanoparticles on the increasing mechanical-electric conversion response is also been explained.

show abstract

Section: Resultssupporting

confidence: 67%

Section: Phase Composition Analyzed By X-ray Diffraction and Infrared...supporting

confidence: 68%

See 1 more Smart Citation

Increasing Permittivity and Mechanical Harvesting Response of PVDF-Based Flexible Composites by Using Ag Nanoparticles onto BaTiO3 Nanofillers

et al. 2022

View full text Add to dashboard Cite

show abstract

“…We finally use AFM‐IR to gain deeper structural insights into the field‐induced behavior by PFM. Here we use contact mode [ 44 ] which is the same as PFM but different from the tapping mode used in our previous AFM‐IR measurements. [ 19 ] The advantage of the contact mode in AFM‐IR over the tapping mode is a better signal‐to‐noise (S/N) ratio of local spectra due to the fact that the contact probe is not tapping/hammering the surface of the fixed local area during operation and the signal is amplified by measurement at the contact resonance.…”

Section: Resultsmentioning

confidence: 99%

Relaxor Ferroelectric Polymers: Insight into High Electrical Energy Storage Properties from a Molecular Perspective

et al. 2021

Self Cite

View full text Add to dashboard Cite

Relaxor ferroelectric polymers exhibit both high dielectric constants and low remnant polarization and thus deliver much higher energy densities and greater charge–discharge efficiencies than normal ferroelectrics for capacitive energy storage applications. Herein, dielectric energy storage behavior of several newly discovered relaxor ferroelectric polymers is studied from a molecular perspective. It is observed that the homopolymers exhibit very slim polarization–electric field loops and the highest charge–discharge efficiencies among ferroelectric polymers, which are attributed to the highly disordered chain conformation as evidenced from the scanning probe microscopy results. Based on the findings on the relaxor homopolymers, the benchmark relaxor ferroelectric terpolymers is revisited and insights into their outstanding capacitive performance are provided. Moreover, it is found that the disordered chain conformation in relaxor ferroelectric polymers remains as the ground state at varied temperatures and applied electric fields, which is in stark contrast to relaxor perovskites whose ground state is strongly dependent on temperatures and external electric fields. The discovery of the absence of thermal‐ and field‐induced phase transition in relaxor ferroelectric polymers makes this class of ferroelectric materials more attractive for advanced electronic and energy applications.

show abstract

“…Various ferroelectric systems have been studied over the last decades, ranging from the common perovskite ferroelectrics, such as BaTiO 3 [ 16 , 17 , 18 , 19 ], multiferroic materials [ 20 , 21 ], such as BiFeO 3 [ 22 , 23 , 24 ] and hexagonal manganites [ 25 , 26 ], multilayered structures of different ferroelectrics [ 14 , 27 , 28 ] to ferroelectric polymers [ 29 , 30 , 31 , 32 ]. In the prototypical perovskite ferroelectrics, the spontaneous polarization originates from the off-center displacement of the transition metal cation at the center of the oxygen octahedron.…”

Section: Introductionmentioning

confidence: 99%

Monitoring Electrical Biasing of Pb(Zr0.2Ti0.8)O3 Ferroelectric Thin Films In Situ by DPC-STEM Imaging

et al. 2021

View full text Add to dashboard Cite

Increased data storage densities are required for the next generation of nonvolatile random access memories and data storage devices based on ferroelectric materials. Yet, with intensified miniaturization, these devices face a loss of their ferroelectric properties. Therefore, a full microscopic understanding of the impact of the nanoscale defects on the ferroelectric switching dynamics is crucial. However, collecting real-time data at the atomic and nanoscale remains very challenging. In this work, we explore the ferroelectric response of a Pb(Zr0.2Ti0.8)O3 thin film ferroelectric capacitor to electrical biasing in situ in the transmission electron microscope. Using a combination of high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) and differential phase contrast (DPC)-STEM imaging we unveil the structural and polarization state of the ferroelectric thin film, integrated into a capacitor architecture, before and during biasing. Thus, we can correlate real-time changes in the DPC signal with the presence of misfit dislocations and ferroelastic domains. A reduction in the domain wall velocity of 24% is measured in defective regions of the film when compared to predominantly defect-free regions.

show abstract

Structural Insight in the Interfacial Effect in Ferroelectric Polymer Nanocomposites

Abstract: Recent advances in the assembly of ceramic oxides and ferroelectric polymers to create ferroelectric polymer nanocomposites have provided a fertile new ground for controlling

Cited by 98 publications

References 59 publications

Increasing Permittivity and Mechanical Harvesting Response of PVDF-Based Flexible Composites by Using Ag Nanoparticles onto BaTiO3 Nanofillers

Increasing Permittivity and Mechanical Harvesting Response of PVDF-Based Flexible Composites by Using Ag Nanoparticles onto BaTiO3 Nanofillers

Relaxor Ferroelectric Polymers: Insight into High Electrical Energy Storage Properties from a Molecular Perspective

Monitoring Electrical Biasing of Pb(Zr0.2Ti0.8)O3 Ferroelectric Thin Films In Situ by DPC-STEM Imaging

Contact Info

Product

Resources

About