title: Fluorographene with high fluorine/carbon ratio: a nanofiller for preparing low-κ polyimide hybrid films.
abstract: Sufficient amounts of fluorographene sheets with different sheet-size and fluorine/carbon ratio were synthesized for preparing of fluorographene/polyimide hybrids in order to explore the effect of fluorographene on the dielectric properties of hybrid materials. It is found that the fluorine/carbon ratio, width of band gap, and sheet-size of fluorographene play the important roles in determining the final dielectric properties of hybrids. The fluorographene with high fluorine/carbon ratio (F/C ≈ 1) presents broaden band gap, enhanced hydrophobicity, good dispersity and thermal stability, etc. Even at a very low filling, only 1 wt %, its polyimide hybrids exhibited drastically reduced dielectric constants as low as 2.1 without sacrificing thermal stability, improved mechanical properties obviously and decreased water absorption by about 120% to 1.0 wt %. This provides a novel route for improving the dielectric properties of materials and a new thought to carry out the application of fluorographene as an advanced material.
authors.affiliation: State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University , Chengdu, Sichuan 610065, China.
authors.forename: Xu
authors.initials: X
authors.lastname: Wang
authors.forename: Yunyang
authors.initials: Y
authors.lastname: Dai
authors.forename: Weimiao
authors.initials: W
authors.lastname: Wang
authors.forename: Mengmeng
authors.initials: M
authors.lastname: Ren
authors.forename: Baoyin
authors.initials: B
authors.lastname: Li
authors.forename: Cong
authors.initials: C
authors.lastname: Fan
authors.forename: Xiangyang
authors.initials: X
authors.lastname: Liu
keywords: dielectric constant; fluorographene; hybrid; polyimide; semiconductor; water absorption