氮氟共掺杂二氧化钛薄膜的制备、表征及杀菌性能  

Preparation,Characterization and Bactericidal Activity of N-F-codoped TiO_2 Film

作　　者：丁卉[1] 张诺[1] 戎非[1,2] 付德刚[1,2] 

机构地区：[1]东南大学生物电子学国家重点实验室,南京210096 [2]东南大学苏州研究院苏州环境与生物安全重点实验室,苏州215123

出　　处：《无机材料学报》2011年第5期517-522,共6页Journal of Inorganic Materials

基　　金：国家"863"计划项目(2006AA10Z436);江苏省科技厅社会发展项目(BE2008643)~~

摘　　要：通过溶胶-凝胶法制备了氮氟共掺杂TiO2(N-F-TiO2)溶胶,并利用丝网印刷法在玻璃基底上制备了N-F-TiO2薄膜,通过XRD,XPS及漫反射对N-F-TiO2进行了表征.XRD分析表明制备出的N-F-TiO2以锐钛矿结晶为主;XPS谱显示N元素以N-Ti-O成键的形式掺杂在晶体中,F元素以表面吸附和晶格掺杂的形式存在;紫外-可见漫反射表明与TiO2相比,N-F-TiO2的吸收强度明显增强,光吸收起始位置有明显红移.利用大肠杆菌做为实验菌种,采用可见光与365nm紫外光分别作为激发光源,对其相对存活率及细胞膜损伤程度进行了研究.结果表明:N-F-TiO2薄膜具有较高的杀菌效率,光照60min时紫外光下大肠杆菌相对存活率降低到0,可见光下为10%;细胞损伤实验结果表明在紫外光作为光催化激发光源时,菌悬液中脂质过氧化物(MDA)含量最大值可以达到1.4 nmol/mg干细胞重,可见光下可以达到0.9 nmol/mg干细胞重.N-F-codoped TiO~ semiconductor Sol （N-F-TiO2） was synthesized by Sol-Gel method, and N-F-TiO2 film was prepared on soda-lime glass using silk-screen printing. X-ray diffraction （XRD） of N-F-TiO2 exhibits significant diffraction peaks representing the characteristic of anatase phase and contain trace amount of brookite. X-ray photo- electron spectroscope （XPS） test indicates that N element exists with N-Ti-O bonding in the crystals, while F element exists as a dopant in the lattice of TiO2 or adsorbs on the surface of N-F-TiO2. Diffuse reflectance spectra （DRS） of N-F-TiO2 shows increased absorption in the range of 300-500 nm compared with that of undoped TiO2 film. Antibac- terial abilities of N-F-TiO2 films under 60min UV and visible light irradiation are identified using E.coli. The prepared N-F-TiO2 films exhibit excellent antibacterial abilities as observed both in bacterial surviving test and cell membrane damaging test. After the irradiation of UV-A, the relative survival percentage of E.coli decreases to 0 and the maxi- mum content of malonaldehyde （MDA） is 1.4 nmol/mg （cell dry weight）. Under the visible light irradiation, relative survival percentage of E.coli decreases to 10% and the maximum content of malonaldehyde is 0.9 nmol/mg （cell dry weight）.

关 键 词：氮掺杂 氟掺杂 TIO2薄膜 光催化 杀菌 

分 类 号：TB383[一般工业技术—材料科学与工程] Q336[生物学—遗传学]