13871
Calculation results show that TiO 2 ( 001 ) - graphdiyne composites possess superior charge separation and oxidation properties , having the longest lifetimes of photoexcited carriers among all of the 2D composites containing TiO 2 of different facets .
 Chemical: TiO 2; Chemical: graphdiyne; Chemical: TiO 2
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: TiO 2; Chemical: graphdiyne; Chemical: TiO 2