11523
In this report , we demonstrate that Raman spectroscopy can be utilized to detect a few percent decrease in the Fermi velocity ( v ( F ) ) of graphene caused by the vdW interaction with underlying hexagonal boron nitride ( hBN ) .
 Chemical: graphene; Chemical: boron nitride
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