Fabricating Solid State Fractional Capacitor in the Frequency Range of mHz to kHz

Abstract

In this letter, we report a simple fabrication process for a wide bandwidth solid-state fractional capacitor (FC). The FC uses a composite of epoxy resin and a conductive gel (CG) as the dielectric in between the two parallel copper plates. The phase of the FCs is constant for a bandwidth of 10 mHz–100 Hz. The bandwidth has further been extended to the kHz range by adding multiwalled carbon nanotube (MWCNT) to the dielectric composite of epoxy resin and CG. We presume that the addition of MWCNT to the dielectric composite facilitates the occurrence of distributive time constant and results in increased bandwidth. The widest bandwidth is 10 mHz–73 kHz which is obtained when the CG and MWCNT loadings are 90% and 0.75%, respectively. We are able to vary the orders of the FC from 0.07 to 0.3 by varying the amounts of CG and MWNCT in the dielectric composite.