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(a–d) Cross section SEM images of PI/rGO-px (x = 0, 10, 20, 40, 60, 80, 100) films adjusted by the mass ratios of PEG to PAAC at 5, 10, 20 and 40 wt.%, respectively. (e–h) Cross sections of the enlarged area in (a–d). (i) Dielectric constant and (j) dielectric loss of PI and PI/rGO-px films vs. frequency. (k) Column diagrams of dielectric constant and dielectric loss of PI and PI/rGO-px films at 1.0 MHz. Reprinted with permission from Ref. [61].
