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The strength of interaction between graphene and the organic molecules was estimated by density functional theory ( PBE , B97D , M06 - 2X , and optB88 - vdW ) , wave function theory ( MP2 , SCS ( MI ) - MP2 , MP2 . 5 , MP2 . X , and CCSD ( T ) ) , and empirical calculations ( OPLS - AA ) using two graphene models : coronene and infinite graphene .
 Chemical: graphene; Chemical: graphene; Chemical: coronene; 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: graphene; Chemical: graphene; Chemical: coronene; Chemical: graphene