Surface structure of ultrathin copolymer films of ferroelectric vinylidene fluoride (70%) with trifluoroethylene (30%) on graphite

被引：34

作者：

Cai, L

Qu, HW

Lu, CX

Ducharme, S

Dowben, PA

Zhang, JD ^{[1
]}

机构：

[1] Florida Int Univ, Dept Phys, Miami, FL 33199 USA

[2] Univ Nebraska, Dept Phys & Astron, Lincoln, NE 68588 USA

[3] Univ Nebraska, Ctr Mat Res & Anal, Lincoln, NE 68588 USA

来源：

PHYSICAL REVIEW B | 2004年 / 70卷 / 15期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevB.70.155411

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The structure and local structural distortions, through the polarization manipulation, of crystalline films of ferroelectric vinylidene fluoride (70%) with trifluoroethylene (30%) [P(VDF-TrFE)] copolymer on graphite were studied by scanning tunneling microscopy (STM). A quasispiral twist in C-C bonds with rotations about the polymer chain axis was observed by high-resolution STM, indicating a surface relaxation of the strained copolymer films. Such a relaxation behavior appears to be linked to the observed local dipole rotations accompanied by the reversal of the local polarization with biasing the STM tip. A structure model is proposed based upon the observations.

引用

收藏

页码：155411 / 1

页数：7

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