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The zigzag edges of graphene on Ir ( 111 ) are studied by ab initio simulations and low - temperature scanning tunneling spectroscopy , providing information about their structural , electronic , and magnetic properties .
 Chemical: graphene; Chemical: Ir ( 111 )
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: Ir ( 111 )