| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Nielsen, Martin Meedom
Technical University of Denmark
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (25/25 displayed)
- 2024Characterization of Deformational Isomerization Potential and Interconversion Dynamics with Ultrafast X-ray Solution Scattering.citations
- 2024Characterization of Deformational Isomerization Potential and Interconversion Dynamics with Ultrafast X-ray Solution Scatteringcitations
- 2020Hot branching dynamics in a light‐harvesting iron carbene complex revealed by ultrafast x‐ray emission spectroscopycitations
- 2020Hot branching dynamics in a light‐harvesting iron carbene complex revealed by ultrafast x‐ray emission spectroscopycitations
- 2020Vibrational wavepacket dynamics in Fe carbene photosensitizer determined with femtosecond X-ray emission and scatteringcitations
- 2019Simulation of ultrafast excited-state dynamics and elastic x-ray scattering by quantum wavepacket dynamicscitations
- 2017Ligand manipulation of charge transfer excited state relaxation and spin crossover in [Fe(2,2′-bipyridine) 2 (CN) 2 ]citations
- 2017Unique Crystal Orientation of Poly(ethylene oxide) Thin Films by Crystallization Using a Thermal Gradientcitations
- 2016Novel micro-reactor flow cell for investigation of model catalysts using in situ grazing-incidence X-ray scatteringcitations
- 2016The negative piezoelectric effect of the ferroelectric polymer poly(vinylidene fluoride)citations
- 2016The negative piezoelectric effect of the ferroelectric polymer poly(vinylidene fluoride)citations
- 2008Organic thin film transistors with polymer brush gate dielectrics synthesized by atom transfer radical polymerizationcitations
- 2007Nanoscale structural characterization of Mg(NH 3 ) 6 Cl 2 during NH 3 desorption:An in situ small angle X-ray scattering studycitations
- 2007Nanoscale structural characterization of Mg(NH3)6Cl2 during NH3 desorptioncitations
- 2006Enhancement of charge-transport characteristics in polymeric films using polymer brushescitations
- 2006Molecular-weight dependence of interchain polaron delocalization and exciton bandwidth in high-mobility conjugated polymerscitations
- 2006Designing solution-processable air-stable liquid crystalline crosslinkable semiconductorscitations
- 2006Activation of a Cu/ZnO catalyst for methanol synthesiscitations
- 2005Structure of zone-cast HBC-C 1 2 H 2 5 filmscitations
- 2005Effects of packing structure on the optoelectronic and charge transport properties in poly(9,9-di-n-octylfluorene-alt-benzothiadiazole)citations
- 2005Effects of Packing Structure on the Optoelectronic and Charge Transport Properties in Poly(9,9-di- n -octylfluorene- alt -benzothiadiazole)citations
- 2005Structure of zone-cast HBC-C12H25 filmscitations
- 2004Electronic Conductivity of Polypyrrole−Dodecyl Benzene Sulfonate Complexescitations
- 2003Induced alignment of a solution-cast discotic hexabenzocoronene derivative for electronic devices investigated by surface X-ray diffractioncitations
- 2000Micro-structure-mobility correlation in self-organised, conjugated polymer field-effect transistorscitations
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article
The negative piezoelectric effect of the ferroelectric polymer poly(vinylidene fluoride)
Abstract
Piezoelectricity describes interconversion between electrical charge and mechanical strain. As expected for lattice ions displaced in an electric field, the proportionality constant is positive for all piezoelectric materials. The exceptions are poly(vinylidene fluoride) (PVDF) and its copolymers with trifluoroethylene (P(VDF-TrFE)), which exhibit a negative longitudinal piezoelectric coefficient. Reported explanations exclusively consider contraction with applied electric field of either the crystalline or the amorphous part of these semi-crystalline polymers. To distinguish between these conflicting interpretations, we have performed in situ dynamic X-ray diffraction measurements on P(VDF-TrFE) capacitors. We find that the piezoelectric effect is dominated by the change in lattice constant but, surprisingly, it cannot be accounted for by the polarization-biased electrostrictive contribution of the crystalline part alone. Our quantitative analysis shows that an additional contribution is operative, which we argue is due to an electromechanical coupling between the intermixed crystalline lamellae and amorphous regions. Our findings tie the counterintuitive negative piezoelectric response of PVDF and its copolymers to the dynamics of their composite microstructure.