13869
Photocatalytic properties of graphdiyne and graphene modified TiO 2 : from theory to experiment .
 Chemical: graphdiyne; Chemical: graphene; Chemical: TiO 2
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: graphdiyne, graphene, TiO 2 
Answer:
 Chemical: graphdiyne; Chemical: graphene; Chemical: TiO 2