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Carbon nanomaterials , especially single - walled carbon nanotubes and graphene , have attracted intense interest in recent years due to their remarkable physicochemical properties .
 Chemical: Carbon; Chemical: carbon; Chemical: graphene
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: carbon; Chemical: graphene