M3,2 and L3,2 XAFS of Au and Pt Nanoparticles on Porous Silicon

XAFS measurements at both the M,,, and L,, edges of Pt and Au as well as sca~~ring electron microscopy studies have been canied out for a series of porous silicon speci~nens onto which fine particles of Au and Pt with nanometre arid tens of nanometre dimensions have been dispersed. A wet chemistry technique developed in our laboratory was used for the deposition. The Au XAFS clearly show that the Au deposits areessentially Au metal while thePt deposits exhibit features that are noticeably different from that of metallic Pt. The M,,, and L,, the XANES and their implications are discussed.