We study local electronic properties of graphene oxide (GO) and reduced graphene oxide (RGO) on metallic (Pt) and insulating (Si3N4) substrates in controlled humidity environment. We demonstrate that the supporting substrate plays a crucial role in interaction of these materials with water, with Pt making both GO and RGO insensitive to humidity variations and change in environment. On the other hand, in the case of Si3N4substrate a significant difference between GO and RGO with respect to humidity variations is demonstrated, indicating complete water coverage at â¼60% R.H for RGO and â¼30% R.H. for GO. Irrespective of the substrate, both GO and RGO demonstrate relative independence of their electronic properties on the material thickness, with similar trends observed for 1 and 2 layers when subject to humidity variations. This indicates a relatively minor role of material thickness in GO-based humidity sensors.
|Titolo:||Role of substrate on interaction of water molecules with graphene oxide and reduced graphene oxide|
PERROZZI, FRANCESCO [Investigation]
FIORAVANTI, GIULIA [Investigation]
OTTAVIANO, LUCA [Supervision]
|Data di pubblicazione:||2017|
|Appare nelle tipologie:||1.1 Articolo in rivista|