Sb对直流反应磁控溅射制备TiO2薄膜的影响

用直流磁控溅射方法在Si(100)面及载玻片上制备了Sb掺杂TiO2薄膜.利用XRD光谱研究了Sb对其薄膜结晶情况的影响,用AFM观察其表面形貌,利用分光光度计测量了TiO2薄膜的光学特性及其对亚甲基蓝的分解活性,通过测量和计算表面对水的接触角来衡量光致亲水性.研究结果表明纯TiO2薄膜为锐钛矿型,适量Sb的掺杂能使TiO2薄膜的结晶有显著改善,并出现Ti2O3和金红石相TiO2,薄膜的光催化活性和光致亲水性明显改善.随着掺杂量的增加,TiO2薄膜的吸收边逐渐红移.但Sb掺杂过量时,破坏了二氧化钛原有的晶格结构,光催化活性和光致亲水性也相应降低.     

掺Sb纳米TiO2薄膜的超亲水性与电化学特性

用溶胶-凝胶法制备了掺杂Sb的纳米TiO2薄膜.通过水接触角、循环伏安法研究了薄膜的光致超亲水性和电化学性质,薄膜的晶体结构由X光衍射(XRD)分析.结果表明:用该方法制备的纯TiO2薄膜中,TiO2主要以锐钛矿结构形式存在,但也含有少量的板钛矿结构.Sb的引入提高了薄膜的结晶效率.与纯TiO2薄膜相比,掺入适量Sb(0.2%)后的薄膜具有更好的光致超亲水性和较强的峰电流.经1小时的紫外光照射后,该薄膜的水接触角接近于0°,峰电流达2.94μA.由XRD计算得薄膜的晶粒大小为(13.3～20)nm.     

掺Sb纳米TiO2薄膜的超亲水性与电化学特性

用溶胶-凝胶法制备了掺杂Sb的纳米TiO2薄膜.通过水接触角、循环伏安法研究了薄膜的光致超亲水性和电化学性质,薄膜的晶体结构由X光衍射(XRD)分析.结果表明:用该方法制备的纯TiO2薄膜中,TiO2主要以锐钛矿结构形式存在,但也含有少量的板钛矿结构.Sb的的引入提高了薄膜的结晶效率.与纯TiO2薄膜相比,掺入适量Sb(0.2％)后的薄膜具有更好的光致超亲水性和较强的峰电流.经1小时的紫外光照射后,该薄膜的水接触角接近于0°,峰电流达2.94μA。由XRD计算得薄膜的晶粒大小为(13.3～20)nm.     

钒离子注入改进Pilkington自洁玻璃材料的亲水性研究

ActivTM玻璃是Pilkington公司推出的具有优异光催化性能和光致亲水性的自洁防雾玻璃,是近几年发展起来的新型建筑材料.其表面的TiO2薄膜的光催化性和亲水性性能都很稳定,但亲水性的光致响应时间较长.采用钒离子注入工艺对ActivTM玻璃进行掺杂改性,研究了钒离子在不同注入能量、浓度和后处理退火温度的条件下对玻璃光致亲水性的影响.研究表明,钒离子注入能够有效改善玻璃表面TiO2薄膜的亲水性,而且,较高钒离子注入能量(90keV)和掺杂浓度(6×10 16ions/cm2),玻璃光致亲水性要好,在紫外光照射1h后接触角均能小于7°,退火温度取500℃为宜.     

Ni2+掺杂对纳米TiO2 薄膜亲水性的影响

用溶胶-凝胶法在玻璃上制备了锐钛矿型TiO2和过渡金属镍掺杂TiO2薄膜。采用XRD、原子力显微镜和表面接触角仪等手段对TiO2薄膜进行了表征。结果表明,少量的镍离子掺杂在一定程度上抑制了TiO2晶粒的生长,提高了薄膜的表面能态,从而改善TiO2薄膜亲水性能和光致亲水性能。镍掺杂摩尔分数2.0%、500℃热处理2 h后,较未掺杂薄膜的亲水性能大幅提高,掺杂镍的薄膜在黑暗中放置一周后仍能表现出超亲水性。     

锐钛矿型TiO2胶体制备抗菌陶瓷的特性研究

利用锐钛矿晶型的纳米TiO2 胶体溶液 ,将硅胶作为粘结剂按不同配比加入TiO2 胶体 ,用提拉法在陶瓷表面形成均匀薄膜并在高温下烘烤成膜。研究TiO2 和硅胶在不同比例情况下的薄膜特性 ,讨论了退火温度对亲水性及光催化活性的影响 ,利用分光光度计测量了TiO2 薄膜对亚甲基蓝的分解活性 ,测定了薄膜对洗涤剂、消毒剂、3 %NaOH和沸水的抗腐蚀能力。结果表明 ,利用这种方法制备的薄膜具有较好的光致亲水性和光催化性 ,并具有良好的抗腐蚀能力。     

反应磁控溅射制备超亲水性SiO2/TiO2多层膜的研究

本文采用反应磁控溅射的方法在玻璃基片上制备TiO2及SiO2／TiO2多层膜，利用X射线衍射（XRD）、原子力显微镜（AFM）、接触角测定等分析方法对试样进行表征。研究了不同制备工艺对薄膜亲水性能的影响，初步讨论了SiO2／TiO2多层膜的超亲水性机理。结果表明这种多层膜结构，其底层SiO2作用在于阻止玻璃中的钠离子在溅射过程中向薄膜中的扩散，适当厚度的顶层SiO2，一方面利用到了SiO2本身的亲水性，同时也利用到了TiO2薄膜的光致亲水性。因此在制备TiO2超亲水性薄膜的时候，考虑制备SiO2底层和顶层对于亲水性效果有明显的改善作用。     

电弧离子镀纳米TiO2光催化薄膜

采用电弧离子镀法在普通玻璃表面制备透明的TiO2薄膜,AFM、XRD分析TiO2薄膜表面形貌和结构,结果表明经过500℃退火后TiO2薄膜主要为锐钛矿结构.对纳米TiO2薄膜进行了亲水性研究和光催化降解有机物甲基橙和罗丹明B的研究,发现在紫外光照射下纳米TiO2薄膜表现出强光催化活性和超亲水性.     

电弧离子镀纳米TiO2光催化薄膜

采用电弧离子镀法在普通玻璃表面制备透明的TiO2薄膜,AFM、XRD分析TiO2薄膜表面形貌和结构,结果表明经过500℃退火后TiO2薄膜主要为锐钛矿结构.对纳米TiO2薄膜进行了亲水性研究和光催化降解有机物甲基橙和罗丹明B的研究,发现在紫外光照射下纳米TiO2薄膜表现出强光催化活性和超亲水性.     

锐钛矿型TiO2胶体制备抗菌陶瓷的特性研究

利用锐钛矿晶型的纳米TiO2胶体溶液，将硅胶作为粘结剂按不同配比加入TiO2胶体，用提拉法在陶瓷表面形成均匀薄膜并在高温下烘烤成膜。研究TiO2和硅胶在不同比例情况下的薄膜特性，讨论了退火温度对亲水性及光催化活性的影响，利用分光光度计测量了TiO2薄膜对亚甲基蓝的分解活性，测定了薄膜对洗涤剂、消毒剂、3％NaOH和沸水的抗腐蚀能力。结果表明，利用这种方法制备的薄膜具有较好的光致亲水性和光催化性，并具有良好的抗腐蚀能力。     

Atmospheric-pressure plasma treatment on polystyrene for the photo-induced grafting polymerization of N-isopropylacrylamide

Atmospheric-pressure plasma (APP) treatment on polystyrene (PS) substrates by using N₂, He, and He/N₂ gases as working gas were investigated in this study, and photo-induced grafting polymerization of N-isopropylacrylamide (NIPAAm) on APP-treated PS substrates was subsequently applied. From the results of the wetting test, PS substrates treated by He-APP process represented a superior hydrophilicity with a contact angle of less than 10°. Surface analyses by X-ray photoelectron spectroscopy (XPS) indicated that functional groups of the carbonyl group (C = O) and carboxyl group (O-C-O) were generated on the surface of PS substrates after APP processes, which were most likely to enhance the surface hydrophilicity. Additionally, the thermosensitive poly-(NIPAAm) grafted on APP-treated PS substrates exhibited a hydrophilic surface (θ_H2O = 32°) below low critical soluble temperature (LCST), and converted into the hydrophobic surface (θ_H2O = 63°) as the ambient temperature exceeded LCST (> 33 °C). Our results suggest that the pre-treatment of PS substrates by APP process can increase the surface hydrophilicity and also be beneficial to the photo-induced grafting polymerization of NIPAAm on PS substrates.     

TiO2复合薄膜光生亲水及防结雾性能研究

利用中频交流磁控溅射技术制备了TiO2薄膜、Ag/TiO2复合薄膜和TiO2:MoO3复合薄膜,研究了TiO2薄膜的光生亲水性和防结雾特性,讨论Ag及MoO3对TiO2薄膜光生亲水性的影响.发现:制备的TiO2薄膜有良好的光生亲水性和防结雾效果,同时薄膜越厚其光生亲水性越明显.800 nm的TiO2薄膜在TUV辐照3 min后其接触角可下降至2°以下.Ag/TiO2复合薄膜是一种接触角在较大范围内可变的薄膜材料,紫外辐射可使其接触角在120°到0°间调节.而TiO2:MoO3复合薄膜的光生亲水性则远比TiO2薄膜差.     

Enhanced effect of vacuum-deposited SiO2 overlayer on photo-induced hydrophilicity of TiO2 film

Photo-induced hydrophilicity of SiO₂/TiO₂ multilayer film prepared by using the vacuum deposition method was investigated by means of water contact angle measurement. Using black light irradiation of the films centering at a wavelength of 365 nm, an extreme photo-induced hydrophilicity was achieved when the TiO₂ film was covered by SiO₂ overlayer ranging from 10 to 20 nm in thickness. These multilayer films exhibited much more extreme hydrophilicity than the TiO₂ film without SiO₂ overlayer. The surface analyses revealed that the enhanced photo-induced hydrophilic surface of the multilayer films exhibited an improved photo-catalytic activity towards decomposition of organic substances on their surfaces. It was found that significant growth of the SiOH group occurred in the uppermost surface of the SiO₂ overlayer of the multilayer films through the depth profile measurement of TOF-SIMS. This result suggests that the photo-generated reactive species such as hole created in the TiO₂ film may transmit the SiO₂ layer to reach the surface. The enhanced photo-induced hydrophilicity of the films can be explained by a synergetic effect of the improved photo-catalytic activity of the multilayer film and the stable hydrophilicity of SiO₂ itself.     

Photocatalytic activity and stability of TiO2/ZnAl layered double hydroxide based coatings on mortar substrates

The surface properties and photocatalytic activity of the cement and pozzolanic mortar samples coated with TiO₂/ZnAl layered double hydroxides were studied with the intention to design suitable protective, hydrophilic coatings. In order to underline the existing correlation between the water uptake characteristics and the surface features, the coated mortars were subjected to water absorption test by capillarity, to photo-induced surface water absorption test and to photo-induced hydrophilicity test by contact angle measurements. The self-cleaning behavior of the mortar systems was evaluated by monitoring the photocatalytic rhodamine B removal efficiency in correlation with the development of photo-induced surface hydrophilicity. The coating durability was assessed towards the weathering effect of rain (essential for the coating self-cleaning properties). The positive result of the coating deposition was the improvement of photocatalytic activity, photo-induced hydrophilicity and the decrease of mortar systems surface roughness. The study revealed that the developed coating promotes self-cleaning effect.     

DBD-CVD法制备掺氮二氧化钛薄膜及其结构性能

采用介质阻挡放电化学气相沉积(DBD-CVD)法制备TiO2透明自清洁功能薄膜,选用四异丙醇钛(TTIP)、NH3作为反应先驱体,另外再加入一定量的N2、Ar或者He作为稀释气体控制气体的流量和流速。通过对其进行X射线衍射、紫外-可见光谱、X光电子能谱、场发射扫描电镜、光催化性质、光亲水性质等测试表明,过DBD-CVD方法制备TiO2薄膜,只存在锐钛矿相,氮掺杂改变了薄膜中锐钛矿相晶粒生长的取向,从而影响薄膜的表面微观结构,促使光吸收限红移,提高了薄膜在可见光照射下的光催化效率,并改善了薄膜表面的亲水性能。     

Grafting of poly(ethylene glycol) monoacrylates on polycarbonateurethane by UV initiated polymerization for improving hemocompatibility

Poly(ethylene glycol) monoacrylates (PEGMAs) with a molecular weight between 400 and 1,000 g mol^?1 were grafted by ultraviolet initiated photopolymerization on the surface of polycarbonateurethane (PCU) for increasing its hydrophilicity and improving its hemocompatibility. The surface-grafted PCU films were characterized by Fourier transformation infrared spectroscopy, X-ray photoelectron spectroscopy, water contact angle, scanning electron microscopy (SEM) and atomic force microscopy measurements. The surface properties of the modified films were studied in dry and wetted state. Blood compatibility of the surfaces was evaluated by platelet adhesion tests and adhered platelets were determined by SEM. The results showed that the hydrophilicity of the films had been increased significantly by grafting PEGMAs, and platelets adhesion onto the film surface was obviously suppressed. Furthermore, the molecular weight of PEGMAs had a great effect on the hydrophilicity and hemocompatibility of the PCU films after surface modification and increased with increasing molecular weight of PEGMAs.     

Effect of nickel oxide seed layers on annealed-amorphous titanium oxide thin films prepared using plasma-enhanced chemical vapor deposition

The effect of a nickel oxide (NiO_x) seed layer on the crystallization and photocatalytic activity of the sequentially plasma-enhanced chemical vapor deposited amorphous titanium oxide (TiO_x) thin film processed by a post-annealing process was investigated. The evolution of the crystalline structures, chemical bond configurations, and surface/cross-sectional morphologies of the annealed TiO_x films, with and without a NiO_x seed layer, was examined using X-ray diffractometer, Fourier transform infrared spectrometry, X-ray photoelectron spectroscopy, atomic force microscopy, and field emission scanning electron microscope measurements. Thermo- and photo-induced hydrophilicity was determined by measuring the contact angle of water droplet. Photocatalytic activity after UV light irradiation was evaluated from the decolorization of a methylene blue solution. The crystallization temperature of the TiO_x film, deposited on a NiO_x seed layer, was found to be lower than that of a pure TiO_x film, further improving the thermo- and photo-induced surface super-hydrophilicity. The TiO_x film deposited onto the NiO_x seed layer, resulting in significant cluster boundaries, showed a rough surface morphology and proved to alleviate the anatase crystal growth by increasing the post-annealing temperature, which yielded a more active surface area and prohibited the recombination of photogenerated electrons and holes. The photocatalytic activity of the NiO_x/TiO_x system with such a textured surface therefore was enhanced and optimized through an adequate post-annealing process.     

常压介质阻挡放电对聚苯乙烯表面改性研究

鉴于介质阻挡放电(DBD)是工业上非常有前途的处理材料表面的环保技术,于是采用常压DBD产生的空气低温等离子体对聚苯乙烯(PS)薄膜进行了表面改性.通过接触角测量、原子力显微镜(AFM)观察和X射线光电子能谱(XPS)分析,研究了空气等离子体处理前后PS薄膜的表面性能的变化.结果表明,PS膜表面润湿性随处理时间的延长而提高,PS膜表面粗糙度增加,而且在表面10nm范围内引入了含氧和含氮的官能团.等离子体处理后PS薄膜润湿性改善的主要原因是由表面粗糙化和引入含氧、含氮极性官能团的复合作用造成的.     

Hydrophilic properties of nano-TiO2 thin films deposited by RF magnetron sputtering

Microstructure and hydrophilicity of nano-titanium dioxide (TiO₂) thin films, deposited by radio frequency magnetron sputtering, annealed at different temperatures, were studied by field emission scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and water contact angle methods. It is found that the crystal phase transforms from amorphous to rutile structure with increase of annealing temperature from room temperature to 800 °C. It is also indicated that the organic contaminants on the surface of the films can be removed and the oxygen vacancies can be reduced by the annealing treatment. Annealed at the temperature below 300 °C, amorphous TiO₂ thin films show rather poor hydrophilicity, and annealed at the temperature range from 400 to 650 °C, the super hydrophilicity anatase of TiO₂ thin films can be observed. However, when the annealing temperature reaches 800 °C, the hydrophilicity of the films declines mainly derived from the appearance of rutile.