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Significantly , the SnS ( 2 ) / TiO ( 2 ) ( AR ) hierarchical nanostructures as the tricomponent heterojunction system possessed stronger photocatalytic activity than the bicomponent heterojunction system of SnS ( 2 ) / TiO ( 2 ) ( A ) hierarchical nanostructures or TiO ( 2 ) ( AR ) nanofibers , which was discussed in terms of the three - way photosynergistic effect between SnS ( 2 ) , TiO ( 2 ) ( A ) and TiO ( 2 ) ( R ) component in the SnS ( 2 ) / TiO ( 2 ) ( AR ) heterojunction resulting in the high separation efficiency of photoinduced electron - hole pairs , as evidenced by photoluminescence ( PL ) and surface photovoltage spectra ( SPS ) .
 Chemical: SnS ( 2 ); Chemical: TiO ( 2 ) ( AR ); Chemical: SnS ( 2 ); Chemical: TiO ( 2 ) ( A ); Chemical: TiO ( 2 ) ( AR ); Chemical: SnS ( 2 ); Chemical: TiO ( 2 ) ( A ); Chemical: TiO ( 2 ) ( R ); Chemical: SnS ( 2 ); Chemical: TiO ( 2 ) ( AR )
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: SnS ( 2 ); Chemical: TiO ( 2 ) ( AR ); Chemical: SnS ( 2 ); Chemical: TiO ( 2 ) ( A ); Chemical: TiO ( 2 ) ( AR ); Chemical: SnS ( 2 ); Chemical: TiO ( 2 ) ( A ); Chemical: TiO ( 2 ) ( R ); Chemical: SnS ( 2 ); Chemical: TiO ( 2 ) ( AR )