Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 8, Pages 10480-10489Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c00304
Keywords
photocatalysis; antibacterial surfaces; CVD; TiO2; transient absorption spectroscopy
Funding
- Imperial College
- EPSRC
- Royal Society [RSG\R1\180434]
- King Abdulaziz City for Science and Technology (KACST), Saudi Arabia
- Saudi Cultural Bureau in London
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Zn and N codoped TiO2 thin films were grown using chemical vapor deposition, with different concentrations of Zn impacting superoxide formation, photocatalytic activity, and bactericidal properties. The 0.4% Zn,N:TiO2 thin film demonstrated the highest formal quantum efficiency in degrading stearic acid, while the 1.0% Zn,N:TiO2 film showed the highest bactericidal activity under both UVA and fluorescent light conditions. The enhanced efficiency of the films was correlated with increased charge carrier lifetime, supported by transient absorption spectroscopy measurements.
We explore a series of Zn and N codoped TiO2 thin films grown using chemical vapor deposition. Films were prepared with various concentrations of Zn (0.4-2.9 at. % Zn vs Ti), and their impact on superoxide formation, photocatalytic activity, and bactericidal properties were determined. Superoxide (O-2(center dot-)) formation was assessed using a 2,3-bis(2-methoxy-4-nitro-5-sulfophenyl)-5-[(phenylamino)carbonyl]-2H-tetrazolium sodium salt (XTT) as an indicator, photocatalytic activity was determined from the degradation of stearic acid under UVA light, and bactericidal activity was assessed using a Gram-negative bacterium E. coli under both UVA and fluorescent light (similar to what is found in a clinical environment). The 0.4% Zn,N:TiO2 thin film demonstrated the highest formal quantum efficiency in degrading stearic acid (3.3 x 10(-5) molecules.photon(-1)), while the 1.0% Zn,N:TiO2 film showed the highest bactericidal activity under both UVA and fluorescent light conditions (>3 log kill). The enhanced efficiency of the films was correlated with increased charge carrier lifetime, supported by transient absorption spectroscopy (TAS) measurements.
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