The effect of X-ray photoelectron spectroscopy measurement on P(VDF-TrFE) copolymer thin films

Mandal, Dipankar; Müller, Klaus; Henkel, Karsten; Schmeißer, Dieter

doi:10.1016/j.apsusc.2012.07.144

Cited by 15 publications

(12 citation statements)

References 29 publications

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“…However, compared with the as-made sample, the intensity of the characteristic peaks associated with β-phase (highlighted area in Figure ) increases under the examined annealing and cooling conditions, indicating that annealing increases the β-phase content in the sample. To quantify the effect of annealing from the FTIR data, fwhm (full width at half-maximum) parameter at peak 1398 cm –1 (which is the most prominent absorption) for each data set were calculated, Figure B. ,, The data shows that the sharpness of the peak increases by 20% and 16%, for slow-cooled and fast-cooled samples, respectively.…”

Section: Results and Discussionmentioning

confidence: 99%

Thermo-electromechanical Behavior of Piezoelectric Nanofibers

Baniasadi¹,

Xü²,

Hong

et al. 2016

ACS Appl. Mater. Interfaces

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High performance piezoelectric devices based on arrays of PVDF-TrFE nanofibers have been introduced in the literature for a variety of applications including energy harvesting and sensing. In this Research Article, we utilize uniaxial tensile test on arrays of nanofibers, microtensile, and nanoindentation and piezo-response force microscopy (PFM) on individual nanofibers, as wells as DSC, XRD, and FTIR spectroscopy to investigate the effect of annealing on microstructure, mechanical, and piezoelectric properties of arrays and individual electrospun nanofibers. For PVDF-TrFE nanofibers annealing in a temperature between the Curie and melting temperature (in paraelectric phase) results in ∼70% increase in crystallinity of the nanofibers. The findings of our multiscale experiments reveal that this improvement in crystallinity results in ∼3-fold increase in elastic modulus, and ∼55% improvement in piezoelectric constant. Meanwhile, the ductility and tensile toughness of the nanofibers drop by ∼1 order of magnitude. In addition, nanoscale cracks were observed on the surface of the annealed nanofibers; however, they did not result in significant change in the strength of the nanofibers. The results of this work may have important implications for applications of PVDF-TrFE in energy harvesting, biomedical, and sensor areas.

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Section: Results and Discussionmentioning

confidence: 99%

Thermo-electromechanical Behavior of Piezoelectric Nanofibers

Baniasadi¹,

Xü²,

Hong

et al. 2016

ACS Appl. Mater. Interfaces

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“…3(f)). 23,24 The binding energies of C 1s for CF 2 , CFH and CH 2 groups were similar to those for pure PVDF–TrFE and hybrid fibers, whereas the binding energy of C 1s for the CH x group changed dramatically with the increasing content of m-PCMP. Pure PVDF–TrFE exhibited a C 1s binding energy peak at 294.9 eV for CH x , which shifted to lower values for hybrid fibers.…”

Section: Resultsmentioning

confidence: 63%

Boosting photocatalytic removal of organic pollutants through enhanced piezoelectricity in free-standing nanofibril pyridyl-functionalized conjugated microporous polymer/poly(vinylidene fluoride–trifluoroethylene) hybrids

et al. 2022

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“…For this terpolymer, one can also easily note three well-separated major components for the C 1s spectrum at 290.7, 288.5, and 286.2 eV. The highest binding energy component corresponds to the −CF 2 – group, whereas the major lowest binding energy peak is from −CH 2 –. − An intermediate component arises due to −CFH– and −CFCl– groups. In addition, a low-intensity component peak is found at binding energy of ∼284.3 eV, which may be attributed to the hydrocarbon contamination .…”

Section: Resultsmentioning

confidence: 84%

“…In the case of bare P(VDF-TrFE) film, we can observe three well separated components for the C 1s spectrum at 290.8, 288.6, and 286.2 eV. The highest binding energy component arises from the −CF 2 – group, whereas the intermediate one is due to −CFH– and the lowest binding energy peak appears from −CH 2 –. − From their intensity ratio calculation, we can determine the ratio of the three components at 290.8, 288.6, and 286.2 eV to be about 9:3:7 for the PVDF-TrFE film. This deduced value is consistent with the theoretical value of 10:3:7.…”

Section: Resultsmentioning

confidence: 90%

Interfacial Interaction of Absorbate Copper Phthalocyanine with PVDF Based Ferroelectric Polymer Substrates: A Spectroscopic Study

Roy

Sinha²,

Wang

et al. 2020

Langmuir

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Studies of CuPc thin films on underlying ferroelectric copolymeric and terpolymeric substrates have been performed by ultraviolet photoelectron spectroscopy (UPS), X-ray photoelectron spectroscopy (XPS), and near-edge X-ray absorption fine structure (NEXAFS) spectroscopy. Work function (WF) and highest occupied molecular orbital (HOMO) energy level shift observed from UPS spectroscopy for successive deposition of CuPc molecules on ferroelectric polymer surfaces confirm the formation of interface dipole at the CuPc−ferroelectric polymer interface owing to charge transfer from the tailing region of the CuPc HOMO density of states (DOS) to the ferroelectric polymer layer. According to our thickness dependent XPS data, CuPc molecules are coupled to the organic ferroelectric surfaces through the central metal atom of the CuPc molecules, i.e., copper atom, and the halogens of underlying ferroelectric polymer surfaces, and hence support the charge transfer phenomenon from CuPc molecules to the ferroelectric polymer substrate. Polarization dependent NEXAFS results reveal that CuPc molecules retain their tilted geometrical configuration even at submonolayer thickness of the molecular films on both ferroelectric surfaces and confirms the electronic structural disturbance associated with structural modification of CuPc molecules due to interfacial charge transfer. Therefore, the energy level alignment with increment in the thickness of CuPc films at both the organic semiconductor−ferroelectric polymer interface is controlled by the charge transfer phenomenon from deposited CuPc molecules to the organic ferroelectric substrates. Our results provide a clear understanding about chemical interactions, molecular configurations, energy level alignment, and their correlation at CuPc/polymeric ferroelectric interfaces that can be important for organic nonvolatile memory and synaptic based thin-film transistor devices.

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The effect of X-ray photoelectron spectroscopy measurement on P(VDF-TrFE) copolymer thin films

Cited by 15 publications

References 29 publications

Thermo-electromechanical Behavior of Piezoelectric Nanofibers

Thermo-electromechanical Behavior of Piezoelectric Nanofibers

Boosting photocatalytic removal of organic pollutants through enhanced piezoelectricity in free-standing nanofibril pyridyl-functionalized conjugated microporous polymer/poly(vinylidene fluoride–trifluoroethylene) hybrids

Interfacial Interaction of Absorbate Copper Phthalocyanine with PVDF Based Ferroelectric Polymer Substrates: A Spectroscopic Study

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