Zn and N Codoped TiO2 Thin Films: Photocatalytic and Bactericidal Activity

被引：26

作者：

Alotaibi, Abdullah M. ^{[1
,2
]}

Promdet, Premrudee ^{[1
]}

Hwang, Gi Byoung ^{[1
]}

Li, Jianwei ^{[1
]}

Nair, Sean P. ^{[3
]}

Sathasivam, Sanjayan ^{[1
]}

Kafizas, Andreas ^{[4
,5
]}

Carmalt, Claire J. ^{[1
]}

Parkin, Ivan P. ^{[1
]}

机构：

[1] UCL, Mat Chem Ctr, Dept Chem, London WC1H 0AJ, England

[2] King Abdulaziz City Sci & Technol KACST, Natl Ctr Bldg & Construct Technol, Riyadh 114426086, Saudi Arabia

[3] UCL Eastman Dent Inst, Dept Microbial Dis, London WC1X 8LD, England

[4] Imperial Coll London, Dept Chem, London SW7 2AZ, England

[5] Imperial Coll London, Grantham Inst, London SW7 2AZ, England

来源：

ACS APPLIED MATERIALS & INTERFACES | 2021年 / 13卷 / 08期

基金：

英国工程与自然科学研究理事会;

关键词：

photocatalysis; antibacterial surfaces; CVD; TiO2; transient absorption spectroscopy; TRANSIENT ABSORPTION-SPECTROSCOPY; DOPED TIO2; ANTIMICROBIAL PROPERTIES; ANTIBACTERIAL PROPERTIES; OPTICAL-PROPERTIES; TITANIUM-DIOXIDE; SURFACE; ANATASE; COPPER; NANOPARTICLES;

D O I：

10.1021/acsami.1c00304

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

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.

引用

页码：10480 / 10489

页数：10