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The morphology and structure of the nanoparticles were characterized by transmission electron microscopy ( TEM ) and energy dispersive X - ray spectroscopy , which confirmed the formation of hollow Ag - Au bimetallic nanoparticles .
 Chemical: Ag - Au
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: Ag - Au