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The petal - like and tree - like graphene networks grown by a plasma enhanced CVD process on a thin ( 500 nm ) silicon oxide layer supported by a silicon wafer demonstrate a significant difference in the resistance - magnetic field dependencies at temperatures ranging from 2 to 200 K .
 Chemical: graphene; Chemical: silicon oxide; 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 oxide; Chemical: silicon