23031
This sequentially grown graphene / h - BN film shows better electronic properties than that of graphene / SiO2 or graphene transferred on h - BN film , and suggests a new promising template for graphene device fabrication .
 Chemical: graphene; Chemical: BN; Chemical: graphene; Chemical: SiO2; Chemical: graphene; Chemical: BN; 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: BN; Chemical: graphene; Chemical: SiO2; Chemical: graphene; Chemical: BN; Chemical: graphene