Polyethylene/Graphene Nanoplatelet Nanocomposite-Based Insulating Materials for Effective Reduction of Space Charge Accumulation in High-Voltage Direct-Current Cables

Figure 3

High-resolution XPS spectra of C 1s peaks of (a) pristine GNP (C: 87.02%, O: 12.98%) and (b) GNP-T (C: 96.09%, O: 3.91%) fillers.

(a)

(b)