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

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 β-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. As a result, this development has significant implications for the potential use of P(VDF–TrFE) in solid-state refrigeration.
Authors:
 [1] ;  [2] ;  [3] ;  [3] ;  [3] ;  [4] ;  [5] ;  [3] ;  [6]
  1. Iowa State Univ., Ames, IA (United States); Ames Lab., Ames, IA (United States); Massachusetts Institute of Technology, Cambridge, MA (United States)
  2. Iowa State Univ., Ames, IA (United States); Univ. of Washington, Seattle, WA (United States)
  3. Iowa State Univ., Ames, IA (United States)
  4. Iowa State Univ., Ames, IA (United States); Washington State Univ., Pullman, WA (United States)
  5. Argonne National Lab. (ANL), Argonne, IL (United States)
  6. Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
Publication Date:
OSTI Identifier:
1227426
Report Number(s):
IS-J--8847
Journal ID: ISSN 1463-9076; PPCPFQ
Grant/Contract Number:
DMR-1105641; AC02-06CH11357; AC02-07CH11358
Type:
Accepted Manuscript
Journal Name:
Physical Chemistry Chemical Physics. PCCP (Print)
Additional Journal Information:
Journal Name: Physical Chemistry Chemical Physics. PCCP (Print); Journal Volume: 17; Journal Issue: 43; Journal ID: ISSN 1463-9076
Publisher:
Royal Society of Chemistry
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE