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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Author(s)
Gilberto de Campos FuzariJr,1, Elen Poliani S. Arlindo1, Maria Aparecida Zaghete2, Elson Longo2 and Walter Katsumi Sakamoto3
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DOI:10.17265/2161-6221/2014.04.005
Affiliation(s)
1. Federal University of Mato Grosso, Campus of Araguaia, Institute of Exact and Earth Sciences, Barra do Garças (MT), Brazil 2. Chemistry Institute of Araraquara, Department of Biochemistry and Chemistry Technology, São Paulo State University – UNESP, Brazil 3. School of Enginnering, Department of Physics and Chemistry, São Paulo State University, UNESP, Campus of Ilha Solteira, Av. Brasil 56, IlhaSolteira (SP) 15385-000, Brazil
ABSTRACT
Composite films were prepared by two different routes: lead zirconate titanate (PZT) particles coated with polyaniline (PAni) dispersed in a polymeric matrix of polyvinylidene fluoride (PVDF); and PZT particles and PAni powder dispersed separately in the polymer matrix. The electrical conductivity of the particles was controlled by the protonation and de-protonation of PAni in solution with controlled pH. The results indicate that the percolation threshold of the composite made of PZT coated with a conductive layer (PZT-PAni) is in the range of 20 vol.% to 30 vol.% of PZT-PAni. The PZT-PAni/PVDF composite redoped in solution with pH 3.7 showed the best results in terms of longitudinal piezoelectric coefficient (d33) in samples containing 30 vol.% of ceramic particles due to the equilibrium between conduction and poling effects on the composite. The poling process of the composite sample required just 5 MV/m electric field applied during 15 min. Furthermore, the composite was used as sensor in structural health monitoring (SHM), showing the possibility to propose it as a functional material.
KEYWORDS
Piezo-composite, controlled conductivity, polarization, PZT coated particles, electrical flux path.
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