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Visible light-responsive core-shell structured In₂O₃@CaIn₂O₄ photocatalyst with superior bactericidal properties and biocompatibility.

Nanomedicine : nanotechnology, biology, and medicine (2011-10-29)
Wen-Ku Chang, Der-Shan Sun, Hao Chan, Pai-Tsang Huang, Wen-Shiang Wu, Ching-Hui Lin, Yao-Hsuan Tseng, Yi-Hung Cheng, Chun-Chieh Tseng, Hsin-Hou Chang
ABSTRACT

Antibacterial activity of photocatalytic substrates is primarily induced by ultraviolet light irradiation. Visible light-responsive photocatalysts were recently discovered, offering greater opportunity to use photocatalysts as disinfectants in our living environment. The development of antibacterial photocatalysts, however, has mainly focused on titanium oxide (TiO(2))-related materials with antibacterial properties not comparable with conventional chemical disinfectants. This study demonstrated that a core-shell structured In(2)O(3)@CaIn(2)O(4) substrate has superior visible light-induced bactericidal properties, as compared with several commercially available and laboratory-prepared visible light-responsive photocatalysts. The high performance is enhanced by more easily photoexcited electron transfer between the interfaces of In(2)O(3) and CaIn(2)O(4) to minimize the electron-hole recombination during photocatalysis. Additionally, when compared with TiO(2)-based photocatalysts, In(2)O(3)@CaIn(2)O(4) treatments did not induce significant cell death and tissue damage, implying a superior biocompatibility. These findings suggest that In(2)O(3)@CaIn(2)O(4) may have potential application in the development of a safer and highly bactericidal photocatalyst. A photocatalytic susbstrate is described that functions in visible light, possesses bactericidal properties and better biocompatibility than the standard TiO(2) based methods.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Indium(III) oxide, 99.99% trace metals basis
Sigma-Aldrich
Indium(III) oxide, 99.998% trace metals basis
Sigma-Aldrich
Indium(III) oxide, nanopowder, <100 nm particle size (TEM), 99.9% trace metals basis