Making Turkish researchers ‘grafeenpapier’ as flexible display




By making a film of graphene on standard printer paper, researchers at Bilkent University in Ankara managed to make a rudimentary flexible electronic display. The display operates by passing of a current across the graphene.

The current causes a change in the way of absorbing light of the graphene layer. In other words, it ensures that the graphene layer is black or semitransparent by intercalation . Passing lasted opaque to semi-transparent in the experiments for some time, namely about four seconds. Going back to the opaque state took less than half a second a lot less time.

In order to apply the graphene layer onto the paper, the researchers had the graphene first vapor deposition on a nickel layer in an oven. Subsequently, the metal is removed by means of etching. After the removal of the metal substrate, a grafeenfilm remains behind in the water. Thereafter, the paper in the water with the grafeenfilm is dipped which then remains behind on the paper. As a final step, the paper is dried at a temperature of 70 ° C.

Multi-pixel display with graphene Multi-pixel display of paper and graphene. Source : ACS Photonics

In order to get a change in light transmittance of the graphene, the paper on both sides have to be covered with graphene. The graphene functions as an electrode at the top and bottom. In order to make any figures in the graphene, must be provided for the removal of a strip of graphene, so that it is no longer connected with the adjacent plane. By providing various jobs to the top and bottom of whether or not current, it is possible to control individual pixels.

A next step that want to take the researchers, the making of electronic paper is that consisting of small pixels, and an integrated circuit to control them. Perhaps it is possible to get batteries with electrodes of graphene on the paper substrate, said lead researcher Coşkun Kocabaş in Nature Photonics.


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