12116
Ternary oxides are potential candidates as an electron - transporting material that can replace TiO 2 in dye - sensitized solar cells ( DSSCs ) , as their electronic / optical properties can be easily controlled by manipulating the composition and / or by doping .
 Chemical: oxides; 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: oxides, TiO 2 
Answer:
 Chemical: oxides; Chemical: TiO 2