Graphene Irradiated with Ions Heartsound Audio

 

Two dimensional materials like Graphene can form the basis of particularly small and fast technology, but this requires a comprehensive understanding of their electric properties. New research shows that fast Electric properties can be probed by introducing the materials to ions first.

The university of Illinois and the university of Duisburg-Essen Have shown that when Graphene is irradiated With ions, or electrically charged atoms- the electrons that are ejected give new information about the behavior of Graphene. Research reported in “Nano Letters”  suggests that when calculations involving high temperature we used,  Graphene verified the predictors of this irradiation. 

“Irradiating Materials and observing the change in properties to deduce what’s going on inside the material is a well established technique, but now we are taking first steps towards using ions instead of laser light for that purpose,” reports Andre Schleife from the Illinois group.

The benefit of ions is that they allow highly localized short term excitations in the material compared to a laser. This allows for exacting studies of how graphene materials evolve over time. 

When an ion collides with a 2-D material, energy is transferred to the atomic nuclei and electrons- some of the electrons are given enough energy to be discharged from the material. The features of these “secondary electrons” Are determined by characteristics such as temperature and energy distribution.

“ There is a delay between the ions ‘impact’ And secondary electron emission, And that’s the key piece of information that we are after in all simulations,” said Yifan Yo,  a top researcher with Schleife’s group. 

The Illinois group executed calculations based on Graphene was irradiated With hydrogen ions- Just bare protons- And it was computed how secondary electrons were released overtime and the corresponding energy spectrum results. These results mated well with the Duisberg-Essen results with Argon and Xenon ions.

High temperature Graphene released more secondary electrons and a careful examination of the distribution proved that the atomic nuclei in Graphene’s lattice rather than the material’s electrons are responsible.

According to Schleife, The technique looks beyond 2D measurements into the future. “ Looking years into the future, there’s a possibility that ion irradiation can be used to deliberately introduce defects into materials and manipulate them.” 

For now, the teams have shown that irradiation can be used as an accurate measurement technique! 

Hugs,

Krissy


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