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In this feature article , we introduce recent progress in nanobiosensor development by exploiting the optical , electrical and catalytic properties of a range of nanomaterials , with a focus on gold nanoparticles , carbon nanotubes , graphene and carbon dots .
 Chemical: carbon; Chemical: graphene; Chemical: carbon
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: carbon, graphene, carbon 
Answer:
 Chemical: carbon; Chemical: graphene; Chemical: carbon