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NEWS FROM THE WORLD OF MATERIALS

Materials in Focus

High strength gold bridge, one atom long
(State University of New York Buffalo News Center. See also the press release by Charlotte Hsu.)
Image courtesy of University at Buffalo. Click image to enlarge.

Image caption: A bridge made of a single atom of gold has twice the strength of bulk gold, according to new UB research.

Smaller is not necessarily weaker, Harsh Deep Chopra and his colleagues at the State University of New York at Buffalo have discovered. In fact, a bridge made of just a single gold atom between a gold substrate and a gold coated cantilever tip has at least twice the modulus of the bulk, they report in a recent paper in Physical Review B. “You would think that if you make these constrictions so tiny they would become ever more fragile,” Chopra says. “Actually, they become even harder to elastically deform.” They note that when the atoms do not have the full coordination of bulk gold, the gold-gold bonds contract and strengthen, which leads to modulus enhancement. This discovery could prove to be important as nano-devices are made smaller and smaller with each generation.

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