6971
The minimum probe concentration to detect single - product molecules on a single TiO ( 2 ) nanoparticle was found to be in the nanomolar range ( < 10 nM ) in acidic solution .
 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 )