Atomic layer deposition fabricated core–shell nanostructures for enhanced polyetherimide composite dielectrics. Issue 24 (10th June 2022)

• Record Type: Journal Article
• Authors: Wu, Xudong; Song, Guanghui; Zhang, Wangle; Feng, Hao; Liu, Yichen; Huang, Enling; Lin, Xiaotian; Yang, Yixin; Tan, Daniel Q.
• Is Part Of: Journal of materials chemistry. Volume 10:Issue 24(2022)
• Page Start: 13097
• Page End: 13105
• Publication Date: 2022-06-10
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2ta02901d
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : The atomic layer deposition technique is utilized to fabricate core–shell nanostructures for enhancing the energy-storage density of advanced polymer composites dielectrics. Abstract : For twenty years, researchers have investigated nanodielectric composites to advance their dielectric properties toward practical applications in capacitors and electrical insulation. Novel concepts are highly anticipated to enhance dielectric strength and energy density while suppressing dielectric loss and the mechanism behind it. In this work, the authors introduce an uncustomary atomic layer deposition (ALD) method to construct the core–shell heterostructure of BaTiO3 nanoparticles. Three different shell materials feature different thermal conductivity and dielectric permittivity. For the first time, the dilute nanofillers fabricated with the ALD technique incorporated in a polyetherimide film simultaneously enhanced the dielectric strength and dielectric constant of the composites. A comparative study on three core–shell designs (BaTiO3 @Al2 O3, BaTiO3 @AlN, BaTiO3 @TiO2 ) revealed the favorable role of higher thermal conductivity (321 W m −1 K −1 for AlN and 25 W m −1 K −1 for Al2 O3 ) in enhancing the dielectric strength of the PEI film as well as inferior lossy behavior induced by the TiO2 shell under high electric fields. The considerable progress witnessed in energy storage performance is further justified by a finite element simulation that reveals the positive effects of the core–shell particles on polarization and energy density distribution across the interfaces. This methodology not only results in a uniform shell distribution and adjustable thickness but also provides an inclusive potential for coating various oxides or nitrides.