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SEM images of (a) bare PPy, (b) SiO2-rGO before PPy coating and (d,e) SiO2-rGO@PPy after PPy coating. In the sample after PPy coating, nanoparticles were adhered to and wrapped into a larger unit. TEM images of (c) SiO2-rGO before PPy coating, and (f) SiO2-rGO after PPy coating (SiO2-rGO@PPy).
