16095
A synergistic graphene oxide - gold nanocluster ( GO - AuNC ) hybrid has been constructed as an enzyme mimic that is able to show high catalytic activity over a broad pH range , especially at neutral pH .
 Chemical: graphene oxide
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 oxide