Semiconductor heterostructures are of critical importance in steering the flow of photocarriers(i.e.e^(−) and h^(+)).Here,we have fabricated heterostructure-based semiconductor fibers comprising electrospun In_(2)O_(3...Semiconductor heterostructures are of critical importance in steering the flow of photocarriers(i.e.e^(−) and h^(+)).Here,we have fabricated heterostructure-based semiconductor fibers comprising electrospun In_(2)O_(3) nanofibers coaxially wrapped by CaIn_(2)S_(4) nanofoils.The hybrid fibers are characterized by a strong interplay between CaIn_(2)S_(4) and In_(2)O_(3),enabling fast photocarrier separation to generate copious reactive species for disinfection.When illuminated by visible light(λ≥400 nm),the hybrid fibers deliver exceptionally high photocatalytic activity for bacterial inactivation(7 log-reduction in viable cell count for 20 min),well-outcompeting the parent compounds,CaIn_(2)S_(4)–In_(2)O_(3) mixtures,and many active photocatalysts reported.The hybrid fibers are type-Ⅱ semiconductor heterojunctions in nature that can enrich photogenerated e^(−) and h^(+) at the different components of the hybrid fibers.This work justifies the importance of semiconductor heterostructures in guiding photocarrier flows and offers a paradigm for the design of semiconductor hybrid fibers in the area of photocatalytic bacterial inactivation.展开更多
基金the National Natural Science Foundation of China(Grant No.51972233 and 52172225)Science and Technology Commission of Shanghai Municipality(Grant No.19DZ2271500)the Fundamental Research Funds for the Central Universities for financial support.
文摘Semiconductor heterostructures are of critical importance in steering the flow of photocarriers(i.e.e^(−) and h^(+)).Here,we have fabricated heterostructure-based semiconductor fibers comprising electrospun In_(2)O_(3) nanofibers coaxially wrapped by CaIn_(2)S_(4) nanofoils.The hybrid fibers are characterized by a strong interplay between CaIn_(2)S_(4) and In_(2)O_(3),enabling fast photocarrier separation to generate copious reactive species for disinfection.When illuminated by visible light(λ≥400 nm),the hybrid fibers deliver exceptionally high photocatalytic activity for bacterial inactivation(7 log-reduction in viable cell count for 20 min),well-outcompeting the parent compounds,CaIn_(2)S_(4)–In_(2)O_(3) mixtures,and many active photocatalysts reported.The hybrid fibers are type-Ⅱ semiconductor heterojunctions in nature that can enrich photogenerated e^(−) and h^(+) at the different components of the hybrid fibers.This work justifies the importance of semiconductor heterostructures in guiding photocarrier flows and offers a paradigm for the design of semiconductor hybrid fibers in the area of photocatalytic bacterial inactivation.
