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. 2019 Oct 23;12(21):3460. doi: 10.3390/ma12213460

Figure 1.

Figure 1

The dependence of surface roughness on modifying laser fluence values (6000 pulses) of polystyrene (PS) samples doped with 40 wt. % of graphene nanoplatelets (GNP). Atomic force microscopy (AFM) images (3 × 3 μm2 and 30 × 30 μm2) include values of Sad (surface area difference) and Ra (roughness of the surface).