The role of nanoporosity on the local piezo and ferroelectric properties of lead titanate thin films
authors Castro, A; Ferreira, P; Rodriguez, BJ; Vilarinho, PM
nationality International
journal JOURNAL OF MATERIALS CHEMISTRY C
keywords RAMAN-SCATTERING; DESIGN; OXIDES
abstract 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.
publisher ROYAL SOC CHEMISTRY
issn 2050-7526
year published 2015
volume 3
issue 5
beginning page 1035
ending page 1043
digital object identifier (doi) 10.1039/c4tc02378a
web of science category Materials Science, Multidisciplinary; Physics, Applied
subject category Materials Science; Physics
unique article identifier WOS:000348300300018
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journal analysis (jcr 2019):
journal impact factor 7.059
5 year journal impact factor 6.404
category normalized journal impact factor percentile 85.94
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