Electrochromism in graphene - 1

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.

http://pubs.acs.org/doi/full/10.1021/nn1014215

Category:

Science & Technology

Tags:

• graphene;
• graphene
• oxide;
• electrochemistry;
• electrochromism;
• electrostatic
• force
• microscopy;
• resistive
• switching;
• tip-induced
• oxidation