M.-C. Saint-Lager;I. Laoufi;M. Mantilla;R. Lazzari;G. Cabailh;J. Jupille;S. Garaudée;O. Robach;P. Dolle;P. Taunier;
The catalytic activity of supported gold nanoparticles  has generated great excitement over the two last decades. Indeed, if there is a large consensus that catalytic gold involves particles smaller than about 5 nm in size, the origin of that chemical activity is still controversial. The reactivity of gold particles was alternately attributed to peripheral property , to low coordinated atoms on the nanoparticles, whose number increases when the size decreases , to a bilayer effect with a maximum in activity for two-atoms-thick clusters  or to the ability of extremely small particles to act as catalyst clusters . Therefore, a direct determination of the size, shape and dimensionality of the gold particles during the catalytic reaction is crucially needed to determine the parameters that dominate the reactivity of the particles.
gold nanoparticles, catalysis, in operando GISAXS
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