Mechanically strong and thermally conductive paper made from aramid nanofiber and fluorinated graphene with excellent dielectric properties

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 10³ 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⁻¹K⁻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

KEYWORDS:

• Aramid nanofiber
• fluorinated graphene
• dielectric property
• thermal conductivity

Acknowledgments

We appreciate financial support from the Postdoctoral Science Foundation of China (No. 2018M643475), the Postdoctoral Interdisciplinary Innovation Foundation of Sichuan University (No. 0030304153008), and the Fundamental Research Funds for the Central Universities (2020SCU12002).

Disclosure statement

No potential conflict of interest was reported by the authors.

Supplementary material

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