shows
th at bo th Pt /C an d Pt – Ag /C s am pl es ex h ib it the cry s ta lli n e f ac e-centered cubic (fc c) structure of platinum at 2 θ (indicated by asterisks).
However, the fcc structure corresponding to XRD diffraction patterns of
silver was not detected. Results suggest that the sizes of Ag entities were
amorphous or were smaller than the detection limit (1–2 nm) of the
XRD technique [1,26,27] . A more sensitive region between 36 and 43°
(Fig. 2b) allows making a comparison between both materials synthe-sized by sonication, the bimetallic sample shows that the pattern does
not correspond to any of the pure metals and exhibits a shift of the