Science Highlights: August 2014 Archives

Recently in Science:

Au102NP.jpg

Structure determination of gold nanoparticles (AuNPs) is necessary for understanding their physical and chemical properties, but only one AuNP larger than 1 nanometer in diameter [a 102-gold atom NP (Au102NP)] has been solved to atomic resolution. Whereas the Au102NP structure was determined by x-ray crystallography, other large AuNPs have proved refractory to this approach. Here, we report the structure determination of a Au68NP at atomic resolution by aberration-corrected transmission electron microscopy, performed with the use of a minimal electron dose, an approach that should prove applicable to metal NPs in general. The structure of the Au68NP was supported by small-angle x-ray scattering and by comparison of observed infrared absorption spectra with calculations by density functional theory.


read about it here:

Azubel M, Koivisto J, Malola S, Bushnell D, Hura GL, Koh AL, Tsunoyama H, Tsukuda T, Pettersson M, Häkkinen H, Kornberg RD. “Nanoparticle imaging. Electron microscopy of gold nanoparticles at atomic resolution.” Science 2014 Aug 22 ;345(6199):909-12 link

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