Alotaibi Abdullah M, Promdet Premrudee, Hwang Gi Byoung, Li Jianwei, Nair Sean P, Sathasivam Sanjayan, Kafizas Andreas, Carmalt Claire J, Parkin Ivan P
Materials Chemistry Centre, Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, U.K.
The National Centre for Building and Construction Technology, King Abdulaziz City for Science and Technology (KACST), Riyadh, 11442-6086, Saudi Arabia.
ACS Appl Mater Interfaces. 2021 Mar 3;13(8):10480-10489. doi: 10.1021/acsami.1c00304. Epub 2021 Feb 17.
We explore a series of Zn and N codoped TiO 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) formation was assessed using a 2,3-bis(2-methoxy-4-nitro-5-sulfophenyl)-5-[(phenylamino)carbonyl]-2-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 under both UVA and fluorescent light (similar to what is found in a clinical environment). The 0.4% Zn,N:TiO thin film demonstrated the highest formal quantum efficiency in degrading stearic acid (3.3 × 10 molecules·photon), while the 1.0% Zn,N:TiO 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.
我们探索了一系列通过化学气相沉积法生长的锌和氮共掺杂二氧化钛薄膜。制备了具有不同锌浓度（相对于钛，锌的原子百分比为0.4 - 2.9%）的薄膜，并测定了它们对超氧形成、光催化活性和杀菌性能的影响。使用2,3 - 双(2 - 甲氧基 - 4 - 硝基 - 5 - 磺基苯基)-5 - [(苯基氨基)羰基]-2 - 四唑鎓钠盐（XTT）作为指示剂评估超氧（O）的形成，通过在紫外光下硬脂酸的降解来测定光催化活性，并使用革兰氏阴性菌在紫外光和荧光下（类似于临床环境中的情况）评估杀菌活性。0.4%的Zn,N:TiO薄膜在降解硬脂酸方面表现出最高的形式量子效率（3.3×10分子·光子），而1.0%的Zn,N:TiO薄膜在紫外光和荧光条件下均表现出最高的杀菌活性（>3个对数级杀灭）。薄膜效率的提高与电荷载流子寿命的增加相关，瞬态吸收光谱（TAS）测量结果支持了这一点。
