Geometrical shape adjustment of KTa0.5Nb0.5O3 nanofillers for tailored dielectric properties of KTa0.5Nb0.5O3/PVDF composite. Issue 32 (31st July 2017)

• Record Type: Journal Article
• Authors: Chen, Gaoru; Yang, Wenlong; Lin, Jiaqi; Wang, Xuan; Li, Dongping; Wang, Yu; Liang, Mengfan; Ding, Weimin; Li, Haidong; Lei, Qingquan
• Is Part Of: Journal of materials chemistry. Volume 5:Issue 32(2017)
• Page Start: 8135
• Page End: 8143
• Publication Date: 2017-07-31
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c7tc01744h
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : The tailored dielectric properties of nanocomposites can be realized by adjusting the shape of introduced nanofillers. Abstract : This paper indicates that rational design and precise control for the structure and shape of nanofillers are effective for achieving the desired permittivity and breakdown strength for high energy densities of polymer nanocomposites. Two types of KTa0.5 Nb0.5 O3 (KTN) nanoparticles with different shapes (NC-KTN and NR-KTN) were introduced into the PVDF matrix. The molecular dynamic simulation and the Brunauer–Emmett–Teller (BET) surface area proved that the nonbonding interaction energy is stronger in the NR-KTN/PVDF composite films due to the larger surface area of NR-KTN (30.96 m 2 g −1 ). In addition, the interfacial polarization related to the shape of nanofillers further improved the dielectric permittivity of NR-KTN/PVDF composite films. Through the comparison between the experimental data and various theoretical models, we concluded that the geometric shape of fillers has a significant impact on the dielectric constant of composite films.