Huge electrocaloric effect in Langmuir-Blodgett ferroelectric polymer thin films

P.F. Liu (1, 2) , J.L. Wang (1) , X.J. Meng (1) , J. Yang (1) , B. Dkhil (2) , J.H. Chu (1)

1 National Laboratory Infrared Phys. - shangai
2 SPMS - Laboratoire Structures, Propriétés et Modélisation des solides

In this work, we studied polyvinylidene fluoride (PVDF)-based ferroelectric copolymer and terpolymer films grown, by the Langmuir-Blodgett (LB) technique, on polyimide substrates. The LB technique is believed to improve the film quality, i.e. to confer better crystallinity and less parasitic amorphous phase. As a consequence, a reversible adiabatic temperature change Delta T up to 21K is demonstrated. The large electrocaloric effects of LB films close to room temperature suggest the potential for applying LB films in cooling systems.

Domaines: Science des matériaux [cond-mat.mtrl-sci]

P.F. Liu, J.L. Wang, X.J. Meng, J. Yang, B. Dkhil, et al.. Huge electrocaloric effect in Langmuir-Blodgett ferroelectric polymer thin films. New Journal of Physics, 2010, 12, pp.023035. ⟨10.1088/1367-2630/12/2/023035⟩. ⟨hal-00583234⟩