Flexible PbTiO3-nanowires/ P(VDF-TrFE) composite films and their dielectric, ferroelectric and pyroelectric properties. Issue 12 (15th August 2018)

• Record Type: Journal Article
• Authors: Yang, Qinghua; Shi, Zhiyong; Ma, Decai; He, Yiqing; Wang, Jin
• Is Part Of: Ceramics international. Volume 44:Issue 12(2018)
• Page Start: 14850
• Page End: 14856
• Publication Date: 2018-08-15
• Subjects: A. Hot pressing -- B. Nanocomposite -- C. Dielectric properties -- Pyroelectric properties; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2018.05.118
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Flexible composite films with PbTiO3 monocrystalline nanowires as fillers and poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) as matrix were prepared by solution-casting and subsequent hot-pressing process. It was found that hot-pressing step is necessary to eliminate the small portion of γ-phase in the solution-cast P(VDF-TrFE) film which could strongly suppress the switchability of the P(VDF-TrFE) matrix. Dielectric, ferroelectric and pyroelectric properties of the nanocomposites have been systematically studied by varying mass fraction of the nanowire fillers from 0 wt% to 50 wt%. Enhanced dielectric permittivities were obtained by incorporating PbTiO3 nanowires without sacrificing the dielectric loss properties. The relative permittivity and dielectric loss of the composites were greatly decreased after poling. P-E loops characteristic of ferroelectrics were observed in all the two-step processed films, showing a highest P r of about 6.21 μC/cm 2 at 30 wt% loading content. Pyroelectric coefficient p of the composites increases with the mass fraction of PbTiO3 nanowires as well as with the temperature, with a value of 52.7 μC/(m 2 K) for pure P(VDF-TrFE) film at 45 °C and 72.8 μC/(m 2 K) for 50 wt% PT/P(VDF-TrFE) composite film at 45 °C. The voltage FOM ( F V ) decreases as the loading of PbTiO3 nanowires increases (more prominently after 10 wt%), while detectivity FOM ( F D ) keeps a relatively high value on the same level (between 18 × 10 −6 Pa −1/2 –20 × 10 −6 Pa −1/2 ) for 0–30 wt% loading content.