17756
Graphene oxide ( GO ) was functionalized covalently with pH - sensitive poly ( 2 - ( diethylamino ) ethyl methacrylate ) ( PDEA ) by surface - initiated in situ atom transfer radical polymerization .
 Chemical: Graphene oxide; Chemical: poly ( 2 - ( diethylamino ) ethyl methacrylate ); Chemical: PDEA
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; Chemical: poly ( 2 - ( diethylamino ) ethyl methacrylate ); Chemical: PDEA