Yvonne Carts-Powell

Controlled transparency in graphene oxide

In Science on June 1, 2011 at 4:20 pm

Variable optical transmission controlled by voltage in thin films of graphene oxide. Courtesy of Aykutlu Dana at Bilkent University.

Graphene is the wonder-material of the day: immensely strong, very hard, zipping electrons around quickly with little resistance, based on carbon so the feedstock is cheap, and exquisitely sensitive to its environment. No wonder scientists around the globe are researching ways to use it.

At Bilkent University, in Ankara Turkey, Professor Aykutlu Dana’s group is looking at how thin films of graphene-oxide change when electrically biased. They found that applying a voltage across the films makes them oxidize or reduce (back to straight graphene), and that changes the optical transparency in a way that is repeatable. The graphic above shows how the transparency at different IR and visible wavelengths changes when a voltage is applied about every 200 seconds.

Read more about it in my OPN article:
Graphene Oxide: Oxidation Increases Transparency.

Or see their paper here: Reversible Electrical Reduction and Oxidation of Graphene Oxide


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