The range of 2 from 10◦ to 100◦ was scanned at the rate of 6◦=min. For target copper K∝( =1 :5406 nm) line was used and to calculate the particle size of Pt crystal Scherrer’s equation was employed. In this case, the (220) face around the 2 of 68◦ was selected to avoid overlapping with Ru peak. More precise results were obtained by small angle X-ray scattering (SAS) technique with a scan rate of 2 1◦=min from 63◦ to 73◦.