AVS 45th International Symposium
    Applied Surface Science Division Wednesday Sessions
       Session AS-WeA

Paper AS-WeA1
Changes in the Band Structure Across the Surface Ferroelectric Phase Transition in the Crystalline Ferroelectric Copolymer P(VDF-TrFE)

Wednesday, November 4, 1998, 2:00 pm, Room 307

Session: Polymer Surfaces, Films and Interfaces
Presenter: J. Choi, University of Nebraska, Lincoln
Authors: J. Choi, University of Nebraska, Lincoln
P.A. Dowben, University of Nebraska, Lincoln
A.V. Bune, University of Nebraska, Lincoln
S. Ducharme, University of Nebraska, Lincoln
V.M. Fridkin, The Russian Academy of Sciences
S.P. Palto, The Russian Academy of Sciences
N. Petukhova, The Russian Academy of Sciences
Correspondent: Click to Email
Recently, the ferroelectric copolymer poly(VDF-TrFE, 70:30) LB films have been attracted because of the new surface ferroelectric phase transition and correlation of the surface ferroelectric transition with the electronic structure.@Footnote 1,2@ The relationship between the electronic structural and the conformational structural change of the crystalline 5 ML films of poly(VDF-TrFE, 70:30) has been studied in detail using several methods angle resolved inverse photoemission spectroscopy, low energy electron diffraction, angle resolved X-ray photoemission, and work function across the surface ferroelectric transition. Their results indicate that the Brillouin zone size is doubled across the surface ferroelectric transition. These is a C-F bond reorientation across the ferroelectric phase transition. Most profound are the change in the unoccupied (conduction band) band structure. @FootnoteText@ @footnote 1@A. V. Bune, V. M. Fridkin, Stephen Ducharme, L. M. Blinov, S. P. Palto, A. Sorokin, S. G. Yudin, and A. Zlatkin, Nature (London) (to be published) @footnote 2@Jaewu Choi, P. A. Dowben, Shawn Pebley, A. V. Bune, Stephen Ducharme, V. M. Fridkin, S. P. Palto, and N. Petukhova, Phys. Rev. Lett. 80, 1328(1998)