The role of nanoporosity on the local piezo and ferroelectric properties of lead titanate thin films

被引：21
|
作者：
Castro, Alichandra [1 ]
Ferreira, Paula [1 ]
Rodriguez, Brian J. [2 ]
Vilarinho, Paula M. [1 ]
机构：
[1] Univ Aveiro, Dept Mat & Ceram Engn, Ctr Res Ceram & Composite Mat, CICECO, P-3800 Aveiro, Portugal
[2] Univ Coll Dublin, Conway Inst Biomol & Biomed Res, Dublin 2, Ireland
来源：
JOURNAL OF MATERIALS CHEMISTRY C | 2015年 / 3卷 / 05期
基金：
爱尔兰科学基金会;
关键词：
RAMAN-SCATTERING; DESIGN;
D O I：
10.1039/c4tc02378a
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Nanoporous and dense ferroelectric PbTiO3 thin films are prepared by a modified sol-gel process. The presence of nanoporosity, with similar to 50 nm pore size formed using a block polymer as a structure-directing agent, markedly affects the microstructure, crystallization and ferroelectric properties of the film. The crystallization of the tetragonal phase is enhanced in nanoporous films. It is suggested that the decomposition of the block-copolymer in porous films triggers the crystallization of the perovskite phase at low temperatures via the local increase of temperature. Consequently, nanoporous films with improved tetragonality exhibit enhanced piezoelectric coefficients, switchable polarization and low local coercivity. By providing a means of achieving enhanced properties, nanoporosity may have a broad impact on the applications of ferroelectric thin films.
引用
收藏
页码：1035 / 1043
页数：9
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