18150
A catalytic growth mechanism for cathode - part graphene synthesis in the arc - discharge apparatus and an exfoliation mechanism for wall - part graphene synthesis are introduced .
 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