Preparation of Relaxor Ferroelectric Polymer Langmuir-Blodgett Films Assisted by Polymer Nanosheets

摘要

Polymer relaxor ferroelectric (RFE) behavior such as narrow hysteresis loop with low remnant polarization andhigh saturation electric field has attracted a great deal of attention for their excellent application potentials inhigh energy storage.1 Poly(vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene) [P(VDF-TrFE-CTFE)](Fig. 1A) is a typical relaxor ferroelectric polymer, in which the third unit CTFE with large size and low dipolemoment is incorporated as defects to physically confine the ferroelectric domain size into nanoscale to achieveRFE structures. In terms of physical pinning force, the Langmuir-Blodgett (LB) technique has been used forpreparation of PVDF nanofilms with tunable thickness assisted by amphiphilic poly(N-dodecylacrylamide)(pDDA) nanosheets (Fig. 1A).2 Moreover, since pDDA barely has polarity, the physical confinement forinterlayers as well as adjacent PVDF nanodomains is expected. Herein, preparation of P(VDF-TrFE-CTFE) LBnanofilms with the aid of pDDA nanosheets will be introduced.