Synchrotron Radiation-Assisted Oxidation of Gold Nanoparticles.

ABSTRACT: We explored the oxidation of solid gold nanoparticles under ambient conditions by X-ray nanodiffraction at a synchrotron radiation source. A droplet of carbohydrate-ligand-functionalized gold nanoclusters was evaporated on a superhydrophobic surface. The resulting layer of core-shell nanoparticles with minimum substrate interactions was repeatedly raster-scanned through a nanoscale X-ray focal spot. We observed radiation-induced liberation of ∼1.3 nm diameter disordered nanoparticles, composed of, on average, 71 gold atoms, and their transformation into ∼2.1 nm diameter face-centered cubic gold nanocrystallites by a nucleation/growth process. Lattice metrology and previously reported simulations supported the formation of a disordered gold oxide surface layer, transforming with increasing

SUBMITTER: Riekel C 

PROVIDER: S-EPMC12921601 | biostudies-literature | 2026 Feb

REPOSITORIES: biostudies-literature