26013
These clusters self - organize to a graphene nanomesh via thermally activated diffusion as their formation energy varies within the graphene moir e supercell .
 Chemical: graphene; 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