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    Oriented polyvinylidene fluoride-trifluoroethylene (P(VDF-TrFE)) films by Langmuir-Blodgett deposition: a synchrotron X-ray diffraction study

    Year: 2015

    Journal: PHYSICAL CHEMISTRY CHEMICAL PHYSICS, Vol. 17, p 29335-29339, 20170208

    Authors: Lindemann, W. R.; Philiph, R. L.; Chan, D. W. W.; Ayers, C. T.; Perez, E. M.; Beckman, S. P.; Strzalka, J.; Chaudhary, S.; Vaknin, D.

    Organizations: Iowa State Univ, Dept Mat Engn, Ames, IA 50011 USA; Ames Natl Lab, Ames, IA 50011 USA; MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA; Univ Washington, Dept Bioengn, Seattle, WA 98105 USA; Iowa State Univ, Dept Elect & Comp Engn, Ames, IA 50011 USA; Washington State Univ, Sch Mech & Mat Engn, Pullman, WA 99164 USA; Argonne Natl Lab, Xray Sci Div, Argonne, IL 60439 USA; Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA

    Langmuir-Blodgett films of polyvinylidene fluoride trifluoroethylene - P(VDF-TrFE)-copolymers possess substantially improved electrocaloric and pyroelectric properties, when compared with conventionally spin-cast films. In order to rationalize this, we prepared single-layered films of P(VDF-TrFE) (70 : 30) using both deposition techniques. Grazing incidence wide-angle X-ray scattering (GIWAXS), reveals that Langmuir-Blodgett deposited films have a higher concentration of the ferroelectric beta-phase crystals, and that these films are highly oriented with respect to the substrate. Based on these observations, we suggest alternative means of deposition, which may substantially enhance the electrocaloric effect in P(VDF-TrFE) films. This development has significant implications for the potential use of P(VDF-TrFE) in solid-state refrigeration.