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Carbon - supported Pt @ Au " core - shell " nanoparticles with varying surface concentration of platinum atoms have been synthesized using a novel redox - mediated synthesis approach .
 Chemical: Carbon; Chemical: Pt; Chemical: Au; Chemical: platinum
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Carbon; Chemical: Pt; Chemical: Au; Chemical: platinum