Development of high-performance purfluorinated polymer electret

Recently, micro power generation using electret-based electrostatic induction attracts much attention due to its large power output at low frequency range [1, 2]. Since theoretical power output is proportional to the square of the surface charge density of electret, development of high-performance electret is required. Boland et al. [1] employed Teflon® AF (Du Pont) as their electret film. We previously found that perfluorinated polymer CYTOP™ CTL-M (Asahi Glass Co., Ltd.) shows high surface charge density of 1.3 mC/m2(at the thickness of 16 μm), which is 3 times larger than that of Teflon AF [2]. This paper presents a new high-performance polymer electret with higher surface charge density, stability, and high thermal resistibility of electric charges.