Reversible Electrical Reduction and Oxidation of Graphene Oxide
Ekiz, Okan O.
Mizrak, A. K.
American Chemical Society
Ekiz, O. O., Urel, M., Guner, H., Mizrak, A. K., & Dˆana, A. (2011). Reversible electrical reduction and oxidation of graphene oxide. Acs Nano, 5(4), 2475-2482.
Please cite this item using this persistent URLhttp://hdl.handle.net/11693/13319
We demonstrate that graphene oxide can be reversibly reduced and oxidized using electrical stimulus. Controlled reduction and oxidation in two-terminal devices containing multilayer graphene oxide films are shown to result in switching between partially reduced graphene oxide and graphene, a process which modifies the electronic and optical properties. High-resolution tunneling current and electrostatic force imaging reveal that graphene oxide islands are formed on multilayer graphene, turning graphene into a self-assembled heterostructure random nanomesh. Charge storage and resistive switching behavior is observed in two-terminal devices made of multilayer graphene oxide films, correlated with electrochromic effects. Tip-induced reduction and oxidation are also demonstrated. Results are discussed in terms of thermodynamics of oxidation and reduction reactions.