Two-dimensional ferroelectricity in monolayer PVDF Langmuir–Blodgett films studied by optical second-harmonic generation

Fokin, Yu. G.; Misuryaev, T.V.; Мурзина, Т. В.; Palto, S. P.; Petukhova, N.; Yudin, S. G.; Aktsipetrov, O.A.

doi:10.1016/s0039-6028(02)01342-0

Cited by 6 publications

(3 citation statements)

References 9 publications

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“…Nonlinear spectroscopy can circumvent the signal overlapping or interference problem because only the phase or medium in which centrosymmetry is lacking contributes to the nonlinear optical signals . For example, second harmonic generation (SHG) spectroscopy has been extensively used to analyze the degree of poling and the orientation of the overall dipole moment of poled polymers. − Among three polymorphs of the crystalline PVDF phases, the noncentrosymmetric β phase is predominantly responsible for the ferroelectric response; thus, SHG can selectively detect the dielectric responses of the β phase in the sample. However, the SHG process lacks the molecular specificity and the details of the CH 2 –CF 2 orientation are deduced indirectly from the SHG responses. , In this study, we employed sum frequency generation (SFG) spectroscopy to directly detect and monitor the polar order of the CH 2 vibrations of the β phase.…”

Section: Introductionmentioning

confidence: 99%

Vibrational Sum Frequency Generation (SFG) Analysis of Ferroelectric Response of PVDF-Based Copolymer and Terpolymer

et al. 2017

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In poly(vinylidene difluoride) (PVDF)-based polymers, the alignment of dipoles of the crystalline β phase with all-trans conformations is responsible for ferroelectricity; however, there is a lack of direct spectroscopic evidence for this phenomenon. We report in situ monitoring of the molecular orientations associated with ferroelectric responses of PVDF-based polymers using vibrational sum frequency generation (SFG) spectroscopy. The orientation of CH2 groups with respect to the −(CH2CF2) n – chain axis of the poled β domains in a PVDF copolymer was determined from the SFG dependence of an uniaxially aligned sample on the laser polarization and azimuthal angle. The relative intensities of CH2 symmetric and asymmetric stretch modes as well as their total intensities revealed the transformation of the all-trans conformation domains during the electrical poling of PVDF based co- and terpolymer films.

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Section: Introductionmentioning

confidence: 99%

Vibrational Sum Frequency Generation (SFG) Analysis of Ferroelectric Response of PVDF-Based Copolymer and Terpolymer

et al. 2017

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“…In addition to annealing and poling, some other methods are also developed to induce the transition from 𝛼 to 𝛽 phase, such as nanoconfinement, [186,187] Langmuir-Blodgett (LB) method, [188,189] and integrated 3D printing. [190,191] These methods also can improve the piezoelectricity of PVDF, but are mostly suitable for laboratory studies.…”

Section: Other Methodsmentioning

confidence: 99%

Recent Progress on Structure Manipulation of Poly(vinylidene fluoride)‐Based Ferroelectric Polymers for Enhanced Piezoelectricity and Applications

Zhang

Zhu

et al. 2023

Adv Funct Materials

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Poly(vinylidene fluoride) (PVDF)‐based polymers demonstrate great potential for applications in flexible and wearable electronics but show low piezoelectric coefficients (e.g., −d33 < 30 pC N−1). The effective improvement for the piezoelectricity of PVDF is achieved by manipulating its semicrystalline structures. However, there is still a debate about which component is the primary contributor to piezoelectricity. Therefore, current methods to improve the piezoelectricity of PVDF can be classified into modulations of the amorphous phase, the crystalline region, and the crystalline–amorphous interface. Here, the basic principles and measurements of piezoelectric coefficients for soft polymers are first discussed. Then, three different categories of structural modulations are reviewed. In each category, the physical understanding and strategies to improve the piezoelectric performance of PVDF are discussed. In particular, the crucial role of the oriented amorphous fraction at the crystalline–amorphous interface in determining the piezoelectricity of PVDF is emphasized. At last, the future development of high performance piezoelectric polymers is outlooked.

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“…It has the advantages of controlled thickness and ordered molecular packing in the ultrathin films. The three-dimensional control of the films gives them the potential for use in various scientific and technological applications such as microelectronics, biometrics, optics and laser scanning [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

SiO2/Cr monolayers and formation of polyethylene films

Wang

Leeman

Schoonheydt

2006

Journal of Colloid and Interface Science

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Two-dimensional ferroelectricity in monolayer PVDF Langmuir–Blodgett films studied by optical second-harmonic generation

Cited by 6 publications

References 9 publications

Vibrational Sum Frequency Generation (SFG) Analysis of Ferroelectric Response of PVDF-Based Copolymer and Terpolymer

Vibrational Sum Frequency Generation (SFG) Analysis of Ferroelectric Response of PVDF-Based Copolymer and Terpolymer

Recent Progress on Structure Manipulation of Poly(vinylidene fluoride)‐Based Ferroelectric Polymers for Enhanced Piezoelectricity and Applications

SiO2/Cr monolayers and formation of polyethylene films

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