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We explore the feasibility of growing a continuous layer of graphene in prepatterned substrates , like an engineered silicon wafer , and we apply this as a mold for the fabrication of AFM probes .
 Chemical: graphene; Chemical: silicon
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: silicon