| Abstract
| - In this report, we describe a general methodology to determine the extent of alloying or atomicdistribution quantitatively in bimetallic nanoparticles (NPs) by X-ray absorption spectroscopy (XAS). Thestructural parameters determined in these studies serve as a quantitative index and provide a generalroute to determine the structural aspects of the bimetallic NPs. We have derived various types of possiblestructural models based on the extent of alloying and coordination number parameters of bimetallic NPs.We also discussed the nature of homo- and heterometallic interactions in bimetallic NPs based on theextent of alloying. Herein, we use carbon-supported platinum−ruthenium bimetallic nanoparticles todemonstrate the proposed methodology, and this can be extended further to get more insights into thealloying extent or atomic distribution of other bimetallic systems. The results demonstrated in this paperopen up methods to determine the atomic distribution of bimetallic NPs, which is an extremely importantparameter that strongly influences the physicochemical properties of NPs and their applications.
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