Enhanced dielectric performance in polymer composite films with carbon nanotube-reduced graphene oxide hybrid filler.
The electrical conductivity and the specific surface area of conductive fillers in conductor-insulator composite films can drastically improve the dielectric performance of those films through changing their polarization density by interfacial polarization. We have made a polymer composite film with a hybrid conductive filler material made of carbon nanotubes grown onto reduced graphene oxide platelets (rG-O/CNT). We report the effect of the rG-O/CNT hybrid filler on the dielectric performance of the composite film. The composite film had a dielectric constant of 32 with a dielectric loss of 0.051 at 0.062 wt% rG-O/CNT filler and 100 Hz, while the neat polymer film gave a dielectric constant of 15 with a dielectric loss of 0.036. This is attributed to the increased electrical conductivity and specific surface area of the rG-O/CNT hybrid filler, which results in an increase in interfacial polarization density between the hybrid filler and the polymer.
Department of Mechanical Engineering and The Materials Science and Engineering Program, The University of Texas at Austin, Austin, TX, 78712, USA.
Jin-Young
JY
Kim
TaeYoung
T
Kim
Ji Won
JW
Suk
Harry
H
Chou
Ji-Hoon
JH
Jang
Jong Ho
JH
Lee
Iskandar N
IN
Kholmanov
Deji
D
Akinwande
Rodney S
RS
Ruoff
carbon nanotube; chemical vapor deposition; dielectric performance; polymer composite film; reduced graphene oxide