Preparation of TiO2 Thin Film and Its Antibacterial Activity

TiO2 nanometer thin films with photocatalytic antibacterial activity were prepared by the sol-gel method on fused quartz and soda lime glass precoated with a SiO2 layer. The thin films were characterized by X-ray photoelectron spectroscopy ( XPS ), scanning electron microscopy (SEM), and X- ray diffraction ( XRD ). The results show that sodium and calcium diffusion into nascent TiO2 film is effectively retarded by the SiO2 layer precoated on the soda lime glass, The antibacterial activity of the films was determined. The crystalline of TiO2 nanometer thin film has important effects on the antibacterial activity of the film.     

Grain Size and Photocatalytic Activity of Nanometer TiO_2 Thin FilmsPrepared by the Sol-gel Method

Transparent anatase TiO2 nanometer thin films with photocatalytic activity were prepared via the sol-gel method on soda-lime glass. The thickness , crystalline phase, grain size, surface hydroxyl amount and so on were characterized by scanning electron microscopy (SEM) , X-ray diffraction (XRD), transmission electron microscopy ( TEM), X-ray photoelectron spectroscopy (XPS) and UV-visible spectrophotometer ( UV-VIS). The photocatalytic activity of TiO2 thin films was evaluated for the photocatalytic decolorization of aqueous methyl orange . The effects of film thickness on the crystalline phase, grain size, transmittance and photocatalytic activity of nanometer Ti02 thin films were discussed.     

Preparation of Nanometer-structured TiO_2 Thin Films by Sol-Gel Method

1　ＩｎｔｒｏｄｕｃｔｉｏｎＴｉＯ2 ｎａｎｏｍｅｔｅｒｔｈｉｎｆｉｌｍｉｓａｖｅｒｙｉｍｐｏｒｔａｎｔｆｕｎｃｔｉｏｎｍａｔｅｒｉａｌ .Ｉｔｈａｓａｖｅｒｙｇｏｏｄｐｒａｃｔｉｃａｌｖｉｓｔａｉｎｓｏｌａｒｅｎｅｒｇｙ ,ｐｈｏｔｏ ｅｌｅｃｔｒｏｃｈｅｍｉｃａｌ ,ｅｎｖｉｒｏｎｍｅｎｔｈａｎｄｌｅｏｆｏｒｇａｎｉｃｃｏｎ ｔａｍｉｎａｔｏｒ,ｅｔｃ[1- 4] ,ｓｏｍｏｒｅａｎｄｍｏｒｅｒｅｓｅａｒｃｈｗｏｒｋｈａｓｂｅｅｎｐｕｔｉｎｔｈｉｓａｓｐｅｃｔ.Ｓｏｌ ｇｅｌｍｅｔｈｏｄｉｓａｖｅｒｙｕｓｅｆｕｌ…     

纳米TiO2-SiO2自清洁复合薄膜制备及其光催化机理

采用溶胶-凝胶法在普通载玻片上制备TiO2-SiO2复合薄膜,研究SiO2添加量对光催化活性的影响,探讨TiO2光催化的机理．结果表明：光催化性随SiO2含量的增加而增加。但SiO2添加量过大,煅烧过程中对TiO2锐钛矿相晶粒生长有抑制作用,而且光催化活性有所下降．当SiO2添加量为30％时,在紫外光照1h时TiO2-SiO2薄膜的光催化活性最佳．     

Bactericidal and Photocatalytie Activity of Fe^3＋-TiO2 Thin Films Prepared by the Sol-gel Method

Pure TiO2 thin films and iron doped TiO2 thin films on glass substrate were prepared by sol-gel method, and characterized by X-ray diffractometer （XRD）, thermo-gravimetric analysis （TG-DSC）, high resolution transmission electron microscope （HRTEM）, scanning electron microscope （SEM） and UV-Vis spectroscopy, respectively. The experimental results show that the pure TiO2 thin films and iron doped TiO2 thin films can destroy most of the escherichia coli and bacillus subtillis under the irradiation of 365 nm UV-light. However, the iron doped TiO2 thin film is a better photocatalyst than pure TiO2 thin film. The ultrastructural studies provide direct evidences for understanding the bactericidal mechanism of the TiO2 photocatalyst.     

TiO_2薄膜的亲水性及光催化自清洁效果

以溶胶-凝胶法为基础,在普通玻璃表面制备了具有纳米尺寸气孔、纳米及微米尺寸复合气孔结构的TiO2薄膜或TiO2/SiO2复合薄膜,并考察了它们的亲水性能及表面经空气中灰尘污染后,其超亲水性能在紫外光照射下的恢复能力。所有纯TiO2薄膜于制备后测试的表面水接触角均达到0°。SiO2的掺杂量较小（10%）时,SiO2的掺入增大了薄膜的水接触角,但随着SiO2掺杂量的增大,接触角减小,可达到超亲水效果。表面污染的薄膜经紫外光照射后,其超亲水性的光致恢复能力基本不受前驱体溶胶的陈化时间、SiO2掺杂浓度、表面形态的影响,但与薄膜的光催化活性有关。4层以上的薄膜或带有SiO2中间隔离层的薄膜由于可以抑制玻璃基底中Na＋扩散至薄膜表面,光催化降解灰尘污染物的能力较高,紫外光照射后均能恢复其超亲水性能。     

铁掺杂纳米TiO2膜的制备与光催化灭菌作用

利用溶胶-凝胶法制备Fe^3＋/TiO2和纯TiO2玻璃膜，用XRD、HRTEM、TG-DSC、SEM等手段表征，并研究膜的特性和结构。试验表明Fe^3＋/TiO2与TiO2均有较强的杀菌能力，但Fe掺杂TiO2的杀菌能力比纯TiO2高8.4%。纳米TiO2薄膜的微观结构分析为揭示TiO2光催化灭菌机理提供了证据。     

Self-cleaning glass coated with Fe~(3 )-TiO_2 thin film

1　INTRODUCTIONTheinfluenceofvariouschemicalsontheenvi ronmentisoneofthemostimportantsocialproblems .Therearemanywaystoabatethepollutionfromthechemicals .Oneofthemostpromisingtechniquesistooxidesuchchemicalsbyphotocatalysis .SinceFranketalreportedthepossibilityofusingTiO2 todecom posecyanideinwaterin 1977[1] ,therehasalsobeenincreasinginterestinenvironmentalapplicationsoftheoxide[2 4 ] .Althoughthemechanismoftitaniumdioxidephotocatalysishasbeenclarified ,therehavebeenfewsuccessfulindustr…     

The Effect of SiO2 Additive on Super-hydrophilic Property of TiO2-SiO2

TiO2-SiO2 thin films have been prepared on slide glass substratesby sol-gel method, and the effect of SiO2 additive on photo-generated hydrophilicity of TiO2 thin film was investigated by measuring the contact angle of water, the microstructure, the transmittance, the photocatalytic activity and the specific surface area. The results showed that 10mol% of SiO2 additive was the most effective for decreasing contact angle of water. The SiO2 additive of less than 30mol% has a suppressive effect on the crystal growth of anatase in calcinations, resulting in a large surface area. Consequently, the super-hydrophilicity was improved.     

The Effect of SiO_2 Additive on Super-hydrophilic Property of TiO_2-SiO_2 Thin Film by Sol-gel Method

TiO2-SiO2 thin films have been prepared on slide glass substrates by sol-gel method, and the effect of SiO2 additive on photo-generated hydrophilicity of TiO2 thin film was investigated by measuring the contact angle of water, the microstructure, the transmittance, the photocatalytic activity and the specific surface area . The results showed that 10mol% of SiO2 additive was the most effective for decreasing contact angle of water. The SiO2 additive of less than 30mol% has a suppressive effect on the crystal growth of anatase in calcinations, resulting in a large surface area. Consequently, the super-hydrophilicity was improved.     

聚乙二醇添加量对TiO_2薄膜光催化性能的影响

采用溶胶－凝胶法,以钛酸丁酯为前驱体,以不同添加量的聚乙二醇（ＰＥＧ,分子量２０００）为添加剂． 在普通载玻片上制备结构可控的多孔ＴＩＯ２纳米薄膜。结果表明：通过调节ＰＥＧ添加量,可以有效地调控薄 膜的结构（如孔径和孔分布）,增大比表面积,进而可提高光催化活性。     

溶胶—凝胶法TiO2光催化膜的制备与研究

本文论述了用溶胶-凝胶法制备TiO2光催化膜的工艺过程;研究了热处理过程中TiO2膜结构转化过程;探讨了影响成膜过程的各种因素及工艺参数。结果表明：适当选择涂液成分、热处理温度,可在普通玻璃基片上制备出性能优良的膜层,其透过率高耐磨并且具有明显的光催化性能。     

衬底效应对LiTaO3薄膜制备的影响

用溶胶凝胶法在N型硅、P型硅、石英、铂、镍衬底上制备了钽酸锂(LiTaO3)薄膜,用XRD和SEM对钽酸锂薄膜性能参数进行了表征;发现掺杂少量环氧树脂能提高钽酸锂薄膜的均匀性,改善薄膜与衬底的粘附性;研究了衬底效应与薄膜厚度的关系,薄膜厚度超过0.2 μm,Ni衬底的XRD峰值强度几乎不再出现,说明衬底对薄膜初始结晶取向有重要影响;利用不同衬底上生长钽酸锂薄膜,XRD研究结果表明:N型硅、P型硅、石英衬底上只能制备多晶钽酸锂薄膜,铂衬底上制备的钽酸锂薄膜在(012)晶向有强大的择优取向性,镍衬底上制备的钽酸锂薄膜有更好的C轴择优取向性,C轴择优取向系数可达0.082。     

Cr沉积TiO_2复合薄膜的制备及其可见光催化性能

真空蒸镀法结合溶胶凝胶法成功制备Cr沉积TiO2三层复合薄膜.通过XRD、SEM、UV-vis等手段表征沉积Cr后的TiO2薄膜的结构、可见光吸收性能,以亚甲基蓝溶液为目标物评定其可见光光催化活性.结果表明:该法制备的Cr沉积TiO2复合薄膜,在723 K热处理后,蒸镀的金属层仍然为金属Cr,823 K时被氧化为Cr2O3.不同温度热处理后Cr沉积的TiO2复合薄膜在可见光区均表现出良好的光吸收性.而且随着热处理温度的升高,光吸收性能明显增强.降解实验表明,823 K热处理后的薄膜样品光催化性能最好.在可见光光照射2 h后,对亚甲基蓝溶液降解率接近40%.     

XPS技术分析离子扩散对TiO2薄膜光催化活性的影响

采用溶胶-凝胶浸渍提拉法在不同玻璃基板上制备TiO2薄膜,通过降解浸渍在薄膜表面的甲基蓝来评价其光催化活性．利用X射线光电子能谱分析TiO2薄膜表面元素,采用平行电极法测定TiO2薄膜的光电流,研究薄膜表面离子扩散情况。结果表明,在相同条件下,光催化活性以石英玻璃为基板的TiO2薄膜较高,而以普通玻璃为基板的TiO2薄膜较低．这是由于在煅烧过程中以普通玻璃为基板的TiO2薄膜,其Na^＋扩散到表面成为电子和空穴的复合中心,降低量子效率所致．     

Photocatalytic Activities of Amorphous TiO2-Cr Thin Films Prepared by Magnetron Sputtering

Chrome-doped titanium oxide films were prepared by reactive magnetron sputtering method. The films deposited on glass slides at room temperature were investigated by atom force microscope, X-ray diffractometer, X-ray photoelectron spectroscopy, UV-Vis spectrophotometer,the photoluminescence (PL) and ellipse polarization apparatus. The results indicate that TiO2-Cr film exists in the form of amorphous. The prepared films possess a band gap of less than 3.20 eV, and a new absorption peak. The films, irradiated for 5 h under UV light, exhibit excellent photocatalytic activities with the optimum decomposition rate at 98.5% for methylene blue. Consequently, the thickness threshold on these films is 114 nm, at which the rate of photodegradation is 95% in 5 h. When the thickness is over 114 nm, the rate of photodegradation becomes stable. This result is completely different from that of crystalloid TiO2 thin film.     

在线常压化学气相沉积方法制备TiO_2自洁薄膜玻璃(英文)

利用常压化学气相沉积技术,在浮法玻璃线上制备了TiO2自洁薄膜玻璃。研究了水和氧气对薄膜沉积速率的影响,结果表明水和氧气的加入增加了薄膜的沉积速率。分别用原子力显微镜和X-射线衍射分析仪研究了薄膜的表面形貌和晶型结构,薄膜表面的平均粗糙度为84 nm,其晶型由锐钛矿和金红石组成。同时还研究了自洁玻璃的光催化活性和亲水性,随着紫外光照时间的增加,薄膜的光催化活性增加且对水的接触角由光照前的54°降到光照后的6°。     

Preparation and Properties of Ag-TiO_2 Thin Films on Glass Substrates

1　ＩｎｔｒｏｄｕｃｔｉｏｎＩｎ 1970ｓ ,ｔｈｅｐｈｏｔｏｃａｔａｌｙｔｉｃｐｒｏｐｅｒｔｙｏｆｔｉｔａｎｉｕｍｄｉｏｘｉｄｅ (ＴｉＯ2 )ｗａｓｆｏｕｎｄｂｙＦｕｊｉｓｈｉｍａｅｔａｌ[1] .ＴｉＯ2 ｉｓｗｈｉｔｅｉｎｃｏｌｏｒ,ｉｎｅｘｐｅｎｓｉｖｅ ,ａｎｄｎｏｎｔｏｘｉｃ .Ｂｅｃａｕｓｅｏｆｉｔｓｓｔｒｏｎｇｐｈｏｔｏｃａｔａｌｙｔｉｃｅｆｆｅｃｔ ,ＴｉＯ2 ｉｓｕｓｅｄｉｎｔｈｅｔｒｅａｔｍｅｎｔｏｆｗａｓｔｅｗａｔｅｒａｎｄｔｈｅｐｕｒｉｆｉｃａｔｉｏｎｏｆａｉｒａｓａｎａｎｔｉｂａｃｔｅｒｉａ…     

STUDY ON PHOTOCATALYTIC MECHANISM OF SOL-GEL-DERIVED Pb-DOPED TiO_2 THIN FILMS

Pb-doped TiO2 photocatalytic thin films were prepared on a soda-lime glass substrate via sol-gel method using TiO2 sol solution containing lead and characterized by X-ray photoelectron spectroscopy (XPS). The results showed that besides oxides of Ti(IV) there is a certain amount of oxides of To(Ⅲ) and Ti(Ⅱ) and Pb exists in the forms of PbTiO3 and PbO. The photocatalytic activity of the Pb-doped TiO2 films was evaluated by the photocatalytic decolorization of aqueous methyl orange and photocatalytic mechanism mas also analyzed.     

Controlled Size and Density Distribution of Nanoparticles by Thermal Ammonia Etching Method

Nickel nanometer catalyst thin films were prepared on SiO2/Si substrates using sputtering coater. The effects of ammonia pretreatment on the catalyst films from continuous film to the nanoparticles were investigated. The nanostructures of the Ni thin films as a function of the catalyst film original thickness, the pretreatment time and temperature were discussed. The optimum parameters of etching process were obtained, and the functional mechanism of ammonia was primarily analyzed. Scanning electron microsc...