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(a) A conceptual front view and a 3D schematic of the proposed fractional capacitor showing the top and bottom electrodes, the polymer matrix, and the graphene sheets; note the capacitances present between each successive graphene sheet (C g1, C g2,…, etc.); (b) theapproximate equivalent network comprising an equivalent capacitance (C 1, C 2,…, etc.) in series with a resistor that models loss (R 1, R 2,…, R n). Ultimately, an overall network would approximate the structure. Horizontal fringing capacitances are ignored assuming that the thickness of the graphene sheet is very small.
(a) SEM image of the wrinkled RGO structures, which is characteristic of graphene oxide nanosheets and (b) XRD analysis on the graphene oxide samples showing conversion to reduced graphene oxide.
(a) Cross-sectional SEM of the RGO-polymer composite and (b) photo of the actual fabricated miniature device.
The measured phase angle versus frequency from 50 kHz up to 1 MHz for different RGO loadings.
The impedance magnitude versus frequency in log scale. The slope in the line equations represents the alpha, and the results confirm the measurement provided in Figure 4 . Explicitly, the values of alpha are approximately 0.38, 0.52, 0.62, 0.66, and 0.74.
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