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Direct chemical vapor deposition ( CVD ) growth of single - layer graphene on CVD - grown hexagonal boron nitride ( h - BN ) film can suggest a large - scale and high - quality graphene / h - BN film hybrid structure with a defect - free interface .
 Chemical: graphene; Chemical: boron nitride; Chemical: BN; Chemical: graphene; Chemical: BN
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: boron nitride; Chemical: BN; Chemical: graphene; Chemical: BN