Bacteria Adherence Properties of Nitrogen-Doped TiO₂ Coatings by Plasma Surface Alloying Technique

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• 作者：Hefeng Wang^a ; ^b ; Bin Tang^a ; ^{tangbintyut@163.com} ; Xiuyan Li^a ; Ailan Fan^a
• 关键词：Titanium dioxide ; Plasma alloying ; Stainless steel ; Bacteria adherence
• 刊名：Physics Procedia
• 出版年：2012
• 期刊代码：P128_18753892
• 类别：ph
• 出版时间：2012
• 卷：32
• 期：Complete
• 页码：401-407
• 文件大小：986 K

摘要

Titanium nitride coatings on 316L stainless steel (S. S) were obtained by plasma surface alloying technique. Nitrogen-doped titanium dioxide (TiO_2-xN_x) was synthesized by oxidative annealing the resulted TiN_x coatings in air. The reference TiO₂ samples were also prepared by oxidation of sputtered Ti coatings. The as-prepared coatings were characterized by X-ray diffraction, glow discharge optical emission spectrometer (GDOES), scanning electron microscopy, X-ray hotoelectron spectroscopy and UV-Vis spectrophotometry, respectively. The bacteria adherence property of the TiO_2-xN_x coatings on stainless steel on the oral bacteria Streptococcus Mutans was investigated and compared with that of stainless steel by fluorescence microscopy. The mechanism of the bacteria adherence was discussed. The results show that the TiO_2-xN_x coatings are composed of anatase crystalline structure. SEM measurement indicates a rough surface morphology with three-dimensional homogenous protuberances after annealing treatment. Optical properties reveal an extended tailing of the absorption edge toward the visible region due to nitrogen presence. The band gap of the N-doped sample is reduced from 2.29 eV to 1.90 eV compared with the pure TiO₂ one. Because of the different roughness and microstructure, the TiO_2-xN_x coatings inhibit the bacteria adherence.