Table 1.

The geometrical parameter in numerical simulation.

Parameter	Symbol (Unit)	value
Thickness of dielectric 1 @ Kapton film	d1 (µm)	20
Thickness of dielectric 2@TiO2 nanoparticulated film and nanotube film	d2(µm)	20
Relative dielectric constant of dielectric 1@ Kapton film	${\epsilon }_{r1}$(–)	3.5
Relative dielectric constant of dielectric 2@ TiO2 thin film, nanoparticulate film, and nanotube film	${\epsilon }_{r2}$(–)	40–140 from refs62–64
Nominal surface area	S(cm2)	2 × 2
Frequency	f(Hz)	2
Maximum distance between two electrodes	xmax(cm)	2