18149
Flake graphite is used as carbon source and ZnO or ZnS as catalyst in the synthesis of high - quality graphene sheets .
 Chemical: graphite; Chemical: carbon; Chemical: ZnO; Chemical: ZnS; 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: graphite; Chemical: carbon; Chemical: ZnO; Chemical: ZnS; Chemical: graphene