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

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: