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Physicists have learned the main reason for the lack of graphene

 

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Group of physicists led by Kirill Bolotin from Vanderbilt University were able to establish the cause of the low electron mobility in graphene. In addition, they were able to increase the rate of three. The results of their work published journal Nature Communications.
The researchers placed a layer of graphene on a special substrate with gold electrodes and measured the velocity of the electrons at immersing the film in a variety of environments. It was found that the greater the matter surrounding the graphene film screens the electric field, the faster the electrons move in the graphene. The maximum electron mobility of 60,000 cm 2 / (V ⋅ s) of the graph shows, when he was immersed in anisole.

Thanks to the results of the researchers did not appear to increase the recipe e-mobility, but they also got the answer to the question of why its value in real graphene is always below the theoretically possible.

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Theoretically, graphene electron mobility should be superior to almost all known materials. But in the process of obtaining the material is contaminated with impurities that carry an electric charge. They, along with the surface folds, suspected physics when looking for the cause of low electron mobility. Prior to joining the group Wetlands suspicions remained theoretical, but now have experimental support. Increase in the electron mobility in the environment, which is well-screens the electric field means that the lowest observed values ​​due to the influence of the electric field of the impurities.

Graphene is an allotropic modification of carbon, along with diamond and graphite. He is a film of a thickness of a single atom, where carbon is located at the corners of the hexagonal grid. This material was obtained originally from Russia Konstantin Novoselov and Andrey Geim. For their discovery, they were awarded the Nobel Prize in 2010.