Investigation of Fabrication, Characterization and Performance of the TiO2 Nanotubes on Ti Substrate

由于TiO2具有良好的化学稳定性、光电特性、抗磨损性、无毒等特点，使其在太阳能电池，光分解水，光催化降解有机污染物以及传感器等方面被广泛研究，成为最具应用潜力的半导体材料。电化学阳极氧化法作为一种常用表面改性处理的方法，被广泛运用于高新科技和民用工业领域。近年来，电化学阳极氧化开始被用于纳米孔洞材料膜的制备，由于纳米材料具有一些与体相材料完全不同的奇特的物理化学特性，使TiO2纳米半导体材料更是引起了科学家的极大关注，成为当前研究的重要热点。本工作侧重发展了电化学阳极氧化法，在钛基体表面制备了一层具有特殊纳米结构的TiO2纳米管阵列膜。利用SEM、XRD、Raman和UV-Vis等手段系统地研...Due to its photo-catalysis, chemical stability, photovoltaic characterization, wearablity and innocuity, TiO2 is one of the important semiconductors in many high-tech applications, such as solar cell, photocleavage, photocatalysis and gas sensor etc. Various techniques have been developed to fabricate nano TiO2 coating on substrates, and great attempts have been paid to study its physico-chemical ...学位：工学硕士院系专业：化学化工学院材料科学系_材料学学号：20023601

Electrical Transport Properties of Individual TiO_2 Nanowire in One Dimension

采用电化学诱导溶胶-凝胶法,在多孔氧化铝模板(AAO)的纳米孔道内制备了直径分别为60和20nm的锐钛矿型TiO2纳米线阵列.利用原子力显微镜(AFM)技术,在半接触模式下得到了TiO2纳米线的形貌像,在接触模式下测量了单根TiO2纳米线的I-V曲线.TiO2纳米线的电子输运性能表现为半导体的性质.TiO2纳米线的导通电压值明显小于TiO2块体,并且随着TiO2纳米线直径的减小,导通电压值增大.The anatase TiO2 nanowire arrays with 60 nm diameter and 20 nm diameter were prepared within the nanochannels of anodic aluminum oxide (AAO) template by an electrochemically induced sol-gel method. Atomic force microscopy (AFM) technique was applied to map topographic image at half-contact mode and to measure current-voltage characteristics of individual TiO2 nanowire at contact mode. The I-V characteristics of individual TiO2 nanowire by AFM revealed semiconductor characteristics. The bias voltage resulting in a measurable current on individual TiO2 nanowire was much lower than that on the bulk TiO2 materials,and its value increased with the diameter of individual nanowire decreasing.国家自然科学基金(50571085)资助项

Fabrication of Highly Ordered Titanium Dioxide Nanotube Array and Investigation of Its Photocatalytic Activity

采用电化学阳极氧化法在钛表面构筑了一种结构有序、微米级的TiO2纳米管阵列膜层.考察了制备电压、氧化时间、溶液搅拌等实验参数对TiO2纳米管阵列形貌和尺寸的影响.应用SEM和XRD对膜层的形貌和晶型进行了分析和表征,并通过TiO2纳米管阵列膜对甲基橙的光催化降解,研究了TiO2纳米管阵列膜层结构与光催化活性的关系.结果表明:阳极电压和溶液搅拌对制备TiO2纳米管阵列的结构起到关键的作用.控制20V电压制备的TiO2纳米管阵列膜,管长达2.6～3.3μm,经500℃热处理后具有最高的光催化活性,其光催化性能明显优于一般的TiO2纳米颗粒膜.A highly ordered titanium dioxide (TiO2) nanotube array film on titanium substrate was fabri- cated by using an electrochemical anodic oxidation method, and some preparation parameters of the TiO2 nanotube arrays were investigated as well. The SEM and XRD experiments were performed to characterize the morphology and crystalline phase of the TiO2 nanotube arrays. It was found that the morphology of the TiO2 nanotube arrays was greatly associated with the anodization voltage. The photocatalytic activity of the TiO2 nanotube array film was evaluated by the decolorization of methyl orange under the illumination of a high-pressure mercury lamp. The results showed that the TiO2 nanotube arrays prepared at 20 V and an- nealed at 500 ℃ exhibited the best photocatalytic activity to the degradation of methyl orange. And the photocatalytic activity of the TiO2 nanotube array film was much higher than that of the regular TiO2 nanoparticle film.国家自然科学基金(No.50571085);; 福建省科技项目(Nos.2005HZ01-3,2007H0031)资助项目

Electrochemical Construction and Biological Performance of Micropatterned CaP Films

基于表面分子自组装和光催化转印技术,在TIO2膜层表面获得超亲/超疏水阵列微图案模板,结合电化学沉积技术,成功制备了微图案化钙磷盐膜(CAP)层.扫描电子显微镜(SEM)和电子探针分析(EPMA)结果表明,通过超亲/超疏水阵列微图案模板可构筑高空间分辨的微图案化钙磷盐膜层.微图案化钙磷盐膜层的体外Mg-63细胞培养证实,细胞对钙磷盐膜层微单元有强烈的选择性粘附作用,从而可望控制细胞在微单元中的贴壁生长,实现高通量评价细胞行为.Based on surface molecule self-assembly and photocatalytic lithography techniques, superhydrophilic/ superhydrophobic micropatterns were fabricated on TiO2 films.Micropatterned calcium phosphate (CaP) films were successfully fabricated by the as-prepared superhydrophilic/superhydrophobic template combined with the electrochemical deposition method.Scanning electron microscopy (SEM) and electron probe microanalysis (EPMA) indicated that micropatterned CaP films with a high spatial resolution could be constructed using the superhydrophilic/ superhydrophobic micropatterns as templates.In vitro MG-63 cell tests of the micropatterned CaP films showed that the cells selectively adhered to the tiny CaP film units, which is promising for the control of the adherent growth of the cells on the tiny units and to achieve a high throughput evaluation of the cell behavior.国家自然科学基金-重大国际合作研究项目(20620130427);国家自然科学基金项目(20773100);国家重点基础研究发展规划项目(973)(2007CB935603);国家科技部国际合作重大项目(2007DFC40440)资助---

Formation Mechanism of Highly Ordered TiO_2 Nanowire Arrays and Its Photoluminescence Properties

采用电化学诱导sol-gel法制备了锐钛矿型TiO2纳米线阵列,初步研究了形成机理和不同沉积时间对其光致发光强度的影响。结果表明:TiO2的生长包括:在含有Ti前驱体的电解质溶液中电沉积钛的羟基氧化物和热处理过程生成TiO2纳米线阵列两个步骤。电化学沉积时间为60min的TiO2纳米线阵列光致发光强度最大,这可能是TiO2与多孔氧化铝模板之间,以及TiO2纳米线的表面与内部之间的相互作用,使得表面氧空位浓度变化的结果。Highly ordered TiO2 nanowire arrays were prepared by an electrochemically induced sol-gel method.Its formation mechanism and the effect of deposition time on the photoluminescence intensities were discussed.It is found that the growth of nanowires involves electrodeposition of titanium oxyhydroxide from aqueous solution containing a Ti precursor and subsequent heat treatment.And the sample deposited for 60 min exhibited a maximum of photoluminescence intensity.It may be resulted from the concentration of oxygen vacancies on the surface area of TiO2 nanowire array,which changed with the interaction between AAO and TiO2,and surface area and inner area of TiO2 nanowires.国家自然科学基金资助项目(20021002,20127302

Progress on Fabrication, Modification and Applications of Titania Nanotube Arrays

第一作者: 孙岚, 女, 41 岁, 博士, 副教授; 研究方向: 纳米材料的制备及其应用。[中文文摘]新型纳米材料TiO2 纳米管阵列具有独特的、高度有序的阵列结构和良好的力学性能、化学稳定性以及抗腐蚀性能。该材料以纯金属钛为基体, 在含有少量氟离子的电解质溶液中通过电化学阳极氧化法制得。本文综述了近年来TiO2 纳米管阵列在不同电解液体系中的制备工艺、形成机理、修饰改性及其在光催化降解污染物、太阳能电池、气敏传感材料、光解水制氢等领域应用的最新研究成果, 并指出目前存在的问题, 对今后的研究提出了展望。[英文文摘]Titania nanotube arrays as a novel nano-material has unique highly ordered array structure, good mechanical and chemical stability, as well as excellent corrosion resistance. It has been fabricated by electrochemical anodization of pure Ti sheet in electrolytes containing small amounts of fluoric ions. This paper reviews the new research achievements of TiO2 nanotube arrays on the preparation processes, forming mechanism, modification and the applications in the photocatalytic degradation of pollutants, solar cells, gas sensor materials,photolysis water. The existing problems and further prospects in this field are also discussed.福建省自然科学基金资助项目(No.2007J0227)。通讯联系人。E-mail: [email protected]

Progress on Fabrication, Modification and Applications of Titania Nanotube Arrays

新型纳米材料TiO2纳米管阵列具有独特的、高度有序的阵列结构和良好的力学性能、化学稳定性以及抗腐蚀性能。该材料以纯金属钛为基体,在含有少量氟离子的电解质溶液中通过电化学阳极氧化法制得。本文综述了近年来TiO2纳米管阵列在不同电解液体系中的制备工艺、形成机理、修饰改性及其在光催化降解污染物、太阳能电池、气敏传感材料、光解水制氢等领域应用的最新研究成果,并指出目前存在的问题,对今后的研究提出了展望。Titania nanotube arrays as a novel nano-material has unique highly ordered array structure, good mechanical and chemical stability, as well as excellent corrosion resistance. It has been fabricated by electrochemical anodization of pure Ti sheet in electrolytes containing small amounts of fluoric ions. This paper reviews the new research achievements of TiO2 nanotube arrays on the preparation processes, forming mechanism, modification and the applications in the photocatalytic degradation of pollutants, solar cells, gas sensor materials, photolysis water. The existing problems and further prospects in this field are also discussed.福建省自然科学基金资助项目(No.2007J0227

Fabrication of highly ordered titanium dioxide nanotube array and investigation of its photocatalytic activity

A highly ordered titanium dioxide (TiO2) nanotube array film on titanium substrate was fabricated by using an electrochemical anodic oxidation method, and some preparation parameters of the TiO2 nanotube arrays were investigated as well. The SEM and XRD experiments were performed to characterize the morphology and crystalline phase of the TiO2 nanotube arrays. It was found that the morphology of the TiO2 nanotube arrays was greatly associated with the anodization voltage. The photocatalytic activity of the TiO2 nanotube array film was evaluated by the decolorization of methyl orange under the illumination of a high-pressure mercury lamp. The results showed that the TiO2 nanotube arrays prepared at 20 V and annealed at 500 degrees C exhibited the best photocatalytic activity to the degradation of methyl orange. And the photocatalytic activity of the TiO2 nanotube array film was much higher than that of the regular TiO2 nanoparticle film

Electrical transport properties of individual TiO2 nanowire in one dimension

The anatase TiO2 nanowire arrays with 60 ran diameter and 20 nm diameter were prepared within the nanochannels of anodic aluminum oxide (AAO) template by an electrochemically induced sol-gel method. Atomic force microscopy (AFM) technique was applied to map topographic image at half-contact mode and to measure current-voltage characteristics of individual TiO2 nanowire at contact mode. The I-V characteristics of individual TiO2 nanowire by AFM revealed semiconductor characteristics. The bias voltage resulting in a measurable current on individual TiO2 nanowire was much lower than that on the bulk TiO2 materials, and its value increased with the diameter of individual nanowire decreasing

Hierarchical layered titanate microspherulite: formation by electrochemical spark discharge spallation and application in aqueous pollutant treatment

An ultrafast and template-free method to synthesize three-dimensional (3D) hierarchical layered titanate microspherulite (TMS) particles with high surface area is reported. The synthesis makes use of an electrochemical spark discharge spallation (ESDS) process, during which a fast anodic reaction on the titanium surface creates a layer of titanium dioxide that instantly breaks down by the applied electrical field into the solution in the form of titanium oxide particles. The spalled particles readily react with the heated NaOH electrolyte to form the titanate particles. A typical as-prepared TMS with a diameter of 0.4 similar to 1.5 mu m is synthesized by ESDS of Ti foils in 10 M NaOH solution under an applied current density of 0.5 A cm(-2), leading to a reaction yield of approximately 0.10 similar to 0.15 g per square centimetre of exposed Ti foil within 20 min. After hydrogen ion exchange, the surface area can reach as high as similar to 406 m(2) g(-1). On the Ti surface, a crystalline rutile TiO2 nanosheet structure is formed, which is attributed to the local exothermic heat caused by the spark discharge. A formation mechanism of the TMS is discussed based on field emission scanning electron microscopy (FESEM), a transmission electron microscopy (TEM) study and Raman scattering spectroscopy analysis. The as-prepared TMS shows excellent adsorption performance compared with a titanate micro-particle (TMP), nanowire (TNW) and nanotube (TNT) when methylene blue (MB) and Pb-II ions are used as representative organic and inorganic pollutants. The mechanism of adsorption has also been discussed.National Research Foundation of Singapore Government [MEWR651/06/160