Figure 3: Chemical protection by RGO.
From: Impermeable barrier films and protective coatings based on reduced graphene oxide
(a) Measurements of Cl-ion permeation through GO and HI-RGO membranes (d≈1 μm). Upper inset: right and left photos (1 cm × 1 cm) show the effect of HF on oxidized Si wafers protected by GO and RGO, respectively. SiO2 is completely removed in the white centre region. Etching away of just 10 nm of SiO2 would be visible as changes in the interference colour, which are absent in the left image. Bottom inset: glass petri dish lined with HI-RGO (≈1-μm thick). (b) X-ray diffraction for thermally, HI- and VC-reduced GO membranes.
