6518
Well - designed hierarchical nanostructures with one dimensional ( 1D ) TiO ( 2 ) nanofibers ( 120 - 350 nm in diameter and several micrometers in length ) and ultrathin hexagonal SnS ( 2 ) nanosheets ( 40 - 70 nm in lateral size and 4 - 8 nm in thickness ) were successfully synthesized by combining the electrospinning technique ( for TiO ( 2 ) nanofibers ) and a hydrothermal growth method ( for SnS ( 2 ) nanosheets ) .
 Chemical: TiO ( 2 ); Chemical: SnS ( 2 ); Chemical: TiO ( 2 ); Chemical: SnS ( 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: SnS ( 2 ); Chemical: TiO ( 2 ); Chemical: SnS ( 2 )