8394
The observation of enhanced photoemission from a one - atom thick graphene layer was possible by taking advantage of the constructive optical interference in the SiO ( 2 ) cavity .
 Chemical: graphene; Chemical: SiO ( 2 )
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: SiO ( 2 )