6/21/2023 0 Comments Normal charge of carbonAs the highly-charged ion approaches, it starts to tear electrons away from the graphene due to its extremely strong electric field. This effect happens even before the highly-charged xenon ion collides with the graphene film. “For us, what is much more interesting is how the electrical field of the highly-charged ion affects the electrons in the graphene film.” “The xenon ion penetrates the graphene film, thereby knocking a carbon atom out of the graphene – but that has very little effect, as the gap that has opened up in the graphene is then refilled with another carbon atom,” explains Gruber. These ions are fired at a free-standing single layer of graphene, which is clamped between microscopically small brackets. “Up to 35 electrons are removed from the xenon atoms, meaning the atoms have a high positive electric charge.” “We work with extremely highly-charged xenon ions,” explains Elisabeth Gruber, a PhD student in Aumayr's research team. The international team received theoretical support from researchers in France and Spain, as well as from other staff at the Institute of Theoretical Physics. The Helmholtz-Center Dresden-Rossendorf and the University of Duisburg-Essen, both in Germany, participated in the experiment alongside TU Wien. Graphene’s extraordinary electronic properties make it a very promising candidate for future applications in the field of electronics. This resulted in extremely high currents, which would not be maintained under normal circumstances. However, the one-atom-thick carbon material was able to replace the electrons within just a few femtoseconds. The team discovered that impacting xenon ions with a particularly high electric charge on a graphene film causes a large number of electrons to be torn away from the graphene in a very precise spot. In a paper in Nature Communications, an international research team led by Fritz Aumayr from the Institute of Applied Physics at TU Wien in Austria report that the electrons in graphene are extremely mobile and can react very quickly. Once again, graphene has proven itself to be a rather special material. However, because graphene is able to transport high electric currents, the positive charge can be rapidly neutralized. The strong electric field generated by the highly-charged ions is able to tear dozens of electrons away from graphene within a matter of femtoseconds.
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