▎ 摘　　要

Ag nanoplatelets (4-7 nm height and 30-50 nm lateral size) supported on a few layers of graphene having preferential facet orientation have been prepared by pyrolysis of nanometric films of chitosan on quartz containing adsorbed Ag+ ions at 900 degrees C under argon. The strong interaction of Ag nanoplatelets and graphene has been deduced from the morphology of the Ag nanoplatelets, their dimensions, the preferential facet orientation, and the 0.4 eV shift toward higher values of the binding energy of the Ag 3d peak in XPS. The facet-oriented Ag on a few layers of graphene film exhibits for the dehydrogenative coupling of dimethylphenylsilane and n-butanol turnover numbers of 1.62 x 10(6) that are higher than that of analogous Aggraphene catalysts lacking strong grafting and preferential orientation.