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Our results open a new design space , suggesting that control of external defects in supporting substrates can lead to tunable graphene chemical sensors , which could be developed without compromising the intrinsic electrical and structural properties of graphene .
 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