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Space - confined distribution of the Pt NPs was achieved within the large dimension PPy nanofiber network , which could enhance the interfacial electron transfer process as well as diminish the catalyst deformation .
 Chemical: Pt; Chemical: PPy
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: Pt; Chemical: PPy