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We study local electronic properties of graphene oxide (GO) and reducedgraphene oxide (RGO) on metallic (Pt) and insulating (Si3N4) substrates incontrolled humidity environment. We demonstrate that the supporting substrateplays a crucial role in interaction of these materials with water, with Ptmaking both GO and RGO insensitive to humidity variations and change inenvironment. On the other hand, in the case of Si3N4 substrate a significantdifference between GO and RGO with respect to humidity variations isdemonstrated, indicating complete water coverage at ~60% R.H for RGO and ~30%R.H. for GO. Irrespective of the substrate, both GO and RGO demonstraterelative independence of their electronic properties on the material thickness,with similar trends observed for 1, 2 and 3 layers when subject to humidityvariations. This indicates a relatively minor role of material thickness inGO-based humidity sensors.

Role of substrate on interaction of water molecules with graphene oxide and reduced graphene oxide