Tiny structures made of gold can be specifically manipulated by ion bombardment at the Vienna University of Technology (TU Wien) – surprisingly, the decisive factor is not the force of the impact. Researchers at TU Wien have found a way to control the geometry of tiny gold particles by bombarding
Highly charged ions hit tiny gold nuggets on an insulating surface. Credit: ucyborg.com/studio
Normally, we have to make a choice in physics: Either we deal with big things – such as a metal plate and its material properties, or with tiny things – such as individual atoms. But there is also a world in between: The world of small but not yet tiny things, in which both effects of the macroscopic world and effects of the microscopic world play a role.
“If you shoot uncharged xenon atoms at the gold islands with the same kinetic energy, the gold islands remain practically unchanged,” says Gabriel Szabo. “So the decisive factor is not the kinetic energy, but the electrical charge of the ions. This charge also carries energy, and it is deposited exactly at the point of impact.”As soon as the extremely strongly positively charged ions hit the nano gold piece, they snatch electrons away from the gold.
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