Imperial College London
Portrait Picture

DrAndreasKafizas

Faculty of Natural Sciences, Department of Chemistry

Senior Lecturer
 
 
 
//

Contact

 

+44 (0)20 7594 6752a.kafizas Website

 
 
//

Location

 

301GMolecular Sciences Research HubWhite City Campus

//

Summary

 

Publications

Citation

BibTex format

@article{Alotaibi:2021:10.1021/acsami.1c00304,
author = {Alotaibi, AM and Promdet, P and Hwang, GB and Li, J and Nair, SP and Sathasivam, S and Kafizas, A and Carmalt, CJ and Parkin, IP},
doi = {10.1021/acsami.1c00304},
journal = {ACS Applied Materials and Interfaces},
pages = {10480--10489},
title = {Zn and N codoped TiO2 thin films: photocatalytic and bactericidal activity.},
url = {http://dx.doi.org/10.1021/acsami.1c00304},
volume = {13},
year = {2021}
}
Download

RIS format (EndNote, RefMan)

TY  - JOUR
AB  - 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 (O2•-) 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 × 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.
AU  - Alotaibi,AM
AU  - Promdet,P
AU  - Hwang,GB
AU  - Li,J
AU  - Nair,SP
AU  - Sathasivam,S
AU  - Kafizas,A
AU  - Carmalt,CJ
AU  - Parkin,IP
DO  - 10.1021/acsami.1c00304
EP  - 10489
PY  - 2021///
SN  - 1944-8244
SP  - 10480
TI  - Zn and N codoped TiO2 thin films: photocatalytic and bactericidal activity.
T2  - ACS Applied Materials and Interfaces
UR  - http://dx.doi.org/10.1021/acsami.1c00304
UR  - https://www.ncbi.nlm.nih.gov/pubmed/33595295
UR  - https://pubs.acs.org/doi/10.1021/acsami.1c00304
UR  - http://hdl.handle.net/10044/1/87176
VL  - 13
ER  -
Download