Orientation of lamellar crystals and its correlation with switching behavior in ferroelectric P(VDF-TrFE) ultra-thin films

被引：33
作者：
Wu, Yangjiang [1 ,2 ]
Li, Xiaohui [1 ,2 ]
Weng, Yuyan [1 ]
Hu, Zhijun [1 ]
Jonas, Alain M. [3 ]
机构：
[1] Soochow Univ, Ctr Soft Condensed Matter Phys & Interdisciplinar, Suzhou 215006, Peoples R China
[2] Soochow Univ, Sch Phys Sci & Technol, Suzhou 215006, Peoples R China
[3] Catholic Univ Louvain, Inst Condensed Matter & Nanosci Bio & Soft Matter, B-1348 Louvain, Belgium
来源：
POLYMER | 2014年 / 55卷 / 03期
基金：
中国国家自然科学基金;
关键词：
Poly(vinylidene fluoride-co-trifluoroethylene); Ferroelectric; Structure; POLY(VINYLIDENE FLUORIDE-CO-TRIFLUOROETHYLENE); SPHERULITIC CRYSTALLIZATION; PHASE-TRANSITION; MOLECULAR CHAIN; POLYMER; THICKNESS; MEMORIES; NANOSTRUCTURES; ENHANCEMENT; TRANSISTORS;
D O I：
10.1016/j.polymer.2014.01.004
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
The ferroelectric properties of poly(vinylidene fluoride-co-trifluoroethylene) (P(VDF-TrFE)) thin films mainly depend on the crystal orientation and crystallinity. We demonstrate here the thermal history and thickness dependent crystal orientation in P(VDF-TrFE) ultrathin films, and its correlation with local polarization reversal. Upon annealing in the paraelectric phase after spin-cast, the lamellar crystals grow preferentially along the crystallographic a axis, with the c axis (chain axis) parallel to the substrate. In contrast, when crystallized in the paraelectric phase from melt, the lamellar crystals take a flat-on orientation with the crystallographic c-axis normal to the substrate. In addition, local measurement by piezoresponse force microscopy indicates that the flat-on crystals do not display any polarization switching, whereas the edge-on crystals exhibit proper switching upon application of a vertical electric field. Importantly, the coercive field measured from the piezoresponse hysteresis loops does not change with the film thickness in the edge-on oriented lamellar crystals. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：970 / 977
页数：8
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