title: Surface-modified Ba(Zr0.3Ti0.7)O3 nanofibers by polyvinylpyrrolidone filler for poly(vinylidene fluoride) composites with enhanced dielectric constant and energy storage density.
abstract: Ferroelectric-relaxor behavior of Ba(Zr0.3Ti0.7)O3 nanofibers (BZT NF) with a large aspect ratio were prepared via electrospinning and surface modified by PVP as dielectric fillers. The nanocomposite flexible films based on surface modified BZT NF and polyvinylidene fluoride (PVDF) were fabricated via a solution casting. The results show that the surface-modified BZT NF fillers are highly dispersed and well integrated in the PVDF nanocomposites. The nanocomposites exhibit enhanced dielectric constant and reduced loss tangents at a low volume fraction of surface-modified BZT NF. The polymer nanocomposites maintain a relatively high breakdown strength, which is favorable for enhancing energy storage density in the nanocomposites. The nanocomposite containing of 2.5 vol. % of PVP modified BZT NF exhibits energy density as high as 6.3 J/cm(3) at 3800 kV/cm, which is more than doubled that of the pure PVDF of 2.8 J/cm(3) at 4000 kV/cm. Such significant enhancement could be attributed to the combined effects of the surface modification and large aspect ratio of the BZT NF. This work may provide a route for using the surface modified ferroelectric-relaxor behavior of ceramic nanofibers to enhance the dielectric energy density in ceramic-polymer nanocomposites.
authors.affiliation: Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Functional Materials Research Laboratory, School of Materials Science &Engineering, Tongji University, 4800 Caoan Road, Shanghai 201804, China.|School of Science, Henan Institute of Engineering, Zhengzhou 451191, China.
authors.forename: Shaohui
authors.initials: S
authors.lastname: Liu
authors.affiliation: Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Functional Materials Research Laboratory, School of Materials Science &Engineering, Tongji University, 4800 Caoan Road, Shanghai 201804, China.
authors.forename: Shuangxi
authors.initials: S
authors.lastname: Xue
authors.affiliation: Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Functional Materials Research Laboratory, School of Materials Science &Engineering, Tongji University, 4800 Caoan Road, Shanghai 201804, China.
authors.forename: Shaomei
authors.initials: S
authors.lastname: Xiu
authors.affiliation: Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Functional Materials Research Laboratory, School of Materials Science &Engineering, Tongji University, 4800 Caoan Road, Shanghai 201804, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Shen
authors.affiliation: Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Functional Materials Research Laboratory, School of Materials Science &Engineering, Tongji University, 4800 Caoan Road, Shanghai 201804, China.
authors.forename: Jiwei
authors.initials: J
authors.lastname: Zhai