Mechanically strong and thermally conductive paper made from aramid nanofiber and fluorinated graphene with excellent dielectric properties. Issue 6 (3rd June 2022)

• Record Type: Journal Article
• Authors: Zhao, Lihua; Wu, Weiqing; Jia, Lichuan; Zhang, Zongxi; Wang, Zhong; Huang, Xiaolong; Ning, Wenjun; Ren, Junwen
• Is Part Of: Composite interfaces. Volume 29:Issue 6(2022)
• Page Start: 659
• Page End: 673
• Publication Date: 2022-06-03
• Subjects: Aramid nanofiber -- fluorinated graphene -- dielectric property -- thermal conductivity; Composite materials -- Periodicals; 620.11805
• DOI: 10.1080/09276440.2021.1990482
• Languages: English
• ISSNs: 0927-6440

Abstract

ABSTRACT: Dielectric materials with excellent thermal stability, mechanical properties, and thermal conductivity are highly desirable for advanced electronics and electrical equipment. However, it remains a significant challenge to develop a single material with these properties. Here we describe a new strategy to prepare dielectric paper by combining one-dimensional aramid nanofiber (ANF) with two-dimensional fluorinated graphene (F-graphene) through a vacuum-assisted filtration method. The obtained ANF/F-graphene paper exhibits a low dielectric constant of 1.92 at 10 3 Hz and its electrical breakdown strength is 17.6% higher than that of the neat ANF paper, owing to the presence of F-graphene, which significantly suppresses the accumulation of space charge in the prepared paper. Moreover, high mechanical strength (>200 MPa), thermal conductivity (6.29 Wm −1 K −1 ), and thermal decomposition temperature (>500°C) are simultaneously achieved for the ANF/F-graphene paper. These findings highlight the fabrication of multifunctional dielectric materials and broaden their practical applications in the field of high-temperature electronics and devices. Graphical abstract: uf0001