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Electrostatic assembly between Fe3 O4 nanospheres and graphene oxide , and subsequent hydrothermal assembly with additional graphene sheets , leads to Fe3 O4 nanospheres encapsulated in the graphene shells and interconnected by the graphene networks .
 Chemical: Fe3 O4; Chemical: graphene oxide; Chemical: graphene; Chemical: Fe3 O4; Chemical: 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: Fe3 O4; Chemical: graphene oxide; Chemical: graphene; Chemical: Fe3 O4; Chemical: graphene; Chemical: graphene