光催化多孔TiO2薄膜的表面形貌对亲水性的影响

从含聚乙二醇（ＰＥＧ）的钛醇盐溶胶前驱体中通过溶胶－凝胶工艺在普通钠钙玻表面制备了多孔锐钛矿型ＴｉＯ２纳米薄膜。用扫描电镜（ＳＥＭ）,Ｘ射线光电子能谱（ＸＰＳ）和红外光谱（ＩＲ）分析了ＴｉＯ２薄膜表面的微结构,结果表明,随着前驱物中聚乙二醇的加入量和分子量的增加,聚乙二醇热分解后的薄膜中产生的气孔就越多且孔径越大,同时ＴｉＯ２薄膜表面的羟基含量增加且表面粗糙度增大。接触角测试表明：随着薄膜中气孔数     

激光熔覆Al2O3+TiO2复合陶瓷涂层的微观结构

研究了４５＃钢表面Ａｌ２Ｏ３＋ＴｉＯ２复合陶瓷激光熔覆层的微观组织和相结构、Ａｌ２Ｏ３＋ＴｉＯ２复合陶瓷激光熔覆涂层由α－Ａｌ２Ｏ３,ＴｉＯ２,γ－ＴｉＯ２,γ－Ａｌ２Ｏ３及Ａｌ２ＴｉＯ５相组成,消除了等离子喷涂层的层状组织特征,形成了大致方向的柱状晶,晶内为溶入了Ｔｉ及少量底层元素的α－Ａｌ２Ｏ３;晶界为由ＴｉＯ２和Ａｌ２Ｏ３形成的Ａｌ２ＴｉＯ５相,溶有少量的Ｃｒ,Ｆｅ,Ｙ取代了Ａｌ２ＴｉＯ５     

溶胶—凝胶法制备Fe2O3—Mn2O3—SiO2膜

用溶胶－凝胶法在浮法玻璃上制备了Ｆｅ２Ｏ３－Ｍｎ２Ｏ３－ＳｉＯ２膜。对膜层的形成特性进行了观察。得出了制备良好膜层的工艺参数。对薄膜的微观结构和光谱特性进行了测定。讨论了薄膜中铁与锰的价态和配位状态。     

TiO2—SiO2溶胶的制备和在水溶性聚氨酯中的分散行为

在ＳｉＯ２质量分散不小于１０％的酸性硅溶胶（粒径分别为１３．７ｎｍ,２６．８ｎｍ）中,加入钛酸正丁酯异丙醇溶液,发生水解、聚合,生成水合ＴｉＯ２;紫外可见光谱和红外光谱及透射电镜观察证实了水合ＴｉＯ２是进一步包覆在硅溶胶胶粒表面,形成了ＴｉＯ２／ＳｉＯ２质量比不小于１０％的ＴｉＯ２－ＳｉＯ２溶胶。大粒径硅溶胶和钛酸正丁酯异丙醇溶液分２次或３次加入,有利于ＴｉＯ２－ＳｉＯ２溶胶的生成。包覆在硅溶胶胶     

TiO2多孔纳米薄膜的溶胶-凝胶法制备和光催化特性研究

锐钛矿型ＴｉＯ２多孔纳米薄膜可以从含聚乙二醇的钛醇盐溶前驱体中通过溶胶－凝胶法制备。涂层的形貌,如孔的大小和孔的分布可以通过聚乙二醇的加入量来控制。当聚乙二醇的加入量为０￣２．０ｇ时,孔径大小在０￣４００ｎｍ范围内变化。可见光透过光谱分析表明：随着ＴｉＯ２薄膜中气孔孔径增大,光的散射增强,透过率减小,该ＴｉＯ２镀膜玻璃对于紫外线具有吸收作用,有机磷农药敌敌畏水溶液在紫外灯照射和ＴｉＯ２多孔纳米薄膜     

TiO2多孔纳米薄膜的溶胶——凝胶法制备和光催化特性研究

锐钛矿型ＴｉＯ２多孔纳米薄膜可以从含聚乙二醇的钛醇盐溶前驱体中通过溶胶－凝胶法制备。涂层的形貌，如孔的大小和孔的分布可以通过聚乙二醇的加入量来控制。当聚乙二醇的加入量为０￣２．０ｇ时，孔径大小在０￣４００ｎｍ范围内变化。可见光透过光谱分析表明：随着ＴｉＯ２薄膜中气孔孔径增大，光的散射增强，透过率减小，该ＴｉＯ２镀膜玻璃对于紫外线具有吸收作用，有机磷农药敌敌畏水溶液在紫外灯照射和ＴｉＯ２多孔纳米薄膜     

Nd2Ti2O7-BaTiO3-TiO2系陶瓷的相结构和介电性能研究

对Ｎｄ２Ｔｉ２Ｏ７－ＢａＴｉＯ３－ＴｉＯ２系陶瓷的相结构和介电性能进行了研究。研究结果表明：少量Ｎｄ２Ｔｉ２Ｏ７（ＮＴ）掺杂到,ＢａＴｉＯ３（ＢＴ）中后形成铁电固溶体材料,其Ｃｕｒｉｅ温度随ＮＴ含量的增加向负温方向移动,同时,材料的晶粒尺寸不断增大;在ＮＴ－ＢＴ－ＴｉＯ２三元系统中,当ＢＴ含量低于６０％（质量分数）时,调整三者的配比,可使烧结后生成的ＢａＮｄ２Ｔｉ５Ｏ１４,Ｂａ２Ｔｉ９Ｏ２０,Ｎｄ     

TiO2薄膜孔结构对其光催化性能的影响

通过在溶胶－凝胶溶液中掺入聚乙烯乙二醇有机聚合物,利用普通釉面砖做衬底,制备了多孔ＴｉＯ２薄膜,扫描电镜观察表明,一定的热处理条件下,有机聚合物可以显著改变ＴｉＯ２薄膜的孔结构。光催化结果显示,适当的孔结构可以明显提高ＴｉＯ２薄膜对有机磷农药的光催化效率。     

固体超强酸TiO_2/SO_4~(2-)催化合成富马酸二甲酯

研究了以ＴｉＯ２／ＳＯ２－４固体超强酸催化富马酸与甲醇合成富马酸二甲酯（ＤＭＦ）的反应,探讨了催化剂制备条件,原料配比,反应时间,催化剂用量等工艺参数对ＤＭＦ收率的影响。在适宜的工艺条件下ＤＭＦ收率达到９０％,催化剂的重复使用实验表明ＴｉＯ２／ＳＯ２－４是ＤＭＦ合成的一个较适宜的催化剂     

溶胶-凝胶TiO2-SiO2二元系统的结晶特征

采用ＸＲＤ和ＤＴＡ－ＴＧ等方法研究了溶胶－凝胶法制备的ＴｉＯ２－ＳｉＯ２二元系统的结晶相，锐钛矿－金红石晶相转移温度与组成的关系，锐钛矿微晶尺寸与组成的关系，探讨形成这些结晶特征的结构原因以及微晶薄膜光电流的影响。     

ZrO2-SiO2二元系统平面光波导薄膜的制备与性能表征

应用溶胶-凝胶技术,以TEOS与ZrOCl2·8H2O为先驱体,研制了用于有源光波导基质材料的ZrO2-SiO2二元系统薄膜,探明了ZrO2-SiO2二元系统薄膜折射率、厚度与薄膜组分、匀胶速度、陈化时间、热处理温度的内在关系,实现薄膜厚度和薄膜折射率在一定范围内的连续可调,为研制一类新型的光通信窗口有源光波导材料提供了基质材料.     

Modified Envelope Method for Obtaining Optical Properties of Weakly Absorbing Thin Films and Its Application to Thin Films of Pb(Zr,Ti)O3 Solid Solutions

A modified envelope method, which includes the consideration of the light intensity loss from the back surface of the substrate, was developed and shown to be a simple and convenient tool for obtaining the optical properties and the thickness of the film by using the transmission spectra alone in the medium and weak absorption regions. In the near-optical band gap region, both the transmission and the reflection spectra were used to calculate the optical constants of the films. This technique was applied to the thin films of PZT solid solutions across the entire composition range. The film thickness derived from the envelope method was cross-checked by a computer simulation method and was found to have an accuracy better than 2%. In addition, the refractive indices were fitted to a simple Sellmeier-type equation for determining the dispersion constants for PZT films. The valid wavelength range of these dispersion relations was from 350 to 2000 nm. The refractive index of the PZT films decreased linearly with increasing zirconium content. On the other hand, the optical band gap energy of the PZT films increased with increasing zirconium content.     

Polymer thin film integrated optics: Fabrication and characterization of polystyrene waveguides

The fabrication and characterization of 1–3 μm polystyrene thin film integrated optical (IO) waveguides is presented. The polymer films were spun-cast onto quartz and glass microscope slides, yielding waveguides of varying quality. The majority of defects in the polymer films appeared to be introduced during the curing process. Laser light (488 nm) was coupled into the polymer films using the prism coupling technique. The collected Raman emission was used to characterize physical and light guiding properties of acceptable polymer films. The Raman intensity spectra collected as a function of the coupling angle supplied data for the calculation of polymer film thickness and refractive index as well as providing general measure of waveguide suitability. The intensity loss due to scatter of several waveguides was also determined to rigorously evaluate waveguide quality.     

TiO2薄膜和多孔薄膜的溶胶-凝胶法制备与表征

本文以钛酸丁酯[Ti（OC4H9）4]、去离子水、盐酸和聚乙二醇（PEG）1000为原料,采用溶胶-凝胶法和旋转涂膜工艺,在玻璃基底上制备纳米TiO2薄膜和TiO2多孔薄膜.利用原子力显微镜（AFM）、X射线衍射仪（XRD）和紫外-可见光谱仪（UV-Vis）对薄膜进行分析表征.结果表明,实验制备的TiO2粉体为锐钛矿晶型,纳米TiO2薄膜的平均粗糙度为17.2nm,TiO2多孔薄膜平均粗糙度为1.55 nm.TiO2多孔薄膜有较高的透射性和光催化活性,可直接用于光催化降解有机物等领域.     

Influence of sprayed nanocrystalline Zn-doped TiO2 photoelectrode with the dye extracted from Hibiscus Surattensis as sensitizer in dye-sensitized solar cell

Highly oriented Zn doped TiO₂ thin films (0, 2, 4, 6 and 8 at%) were deposited by spray pyrolysis technique. X-ray diffraction analysis showed a strong orientation along (101) direction for 6 at% Zn with polycrystalline tetragonal anatase phase. Scanning electron microscopy observations revealed uniform distribution of spherical-shaped grains, whereas columnar arrangement of tetragonal-shaped grains with porous nature was revealed from atomic force microscopy. Transmittance spectra indicated a decrease in the energy band gap with increasing doping concentration; i.e. 3.55 up to 3.21 eV, attributed to grain refinement to the nanoscale regime. The optical constants such as refractive index and extinction coefficient as a function of wavelength, were determined; the low extinction coefficient values confirmed the good quality of the thin films. Photoluminescence spectra showed strong emissions at 423 and 437 nm with a weak emission at 505 nm, which confirmed the lesser defect density in 6 at% Zn film. The electrical properties studied by Hall Effect measurements revealed that the 6 at% Zn led to an increase in the carrier concentration, as well as an increase in the mobility with a least resistivity. The efficiency of dye sensitized solar cells, assembled by using natural dye extracted from Hibiscus Surattensis as sensitizer and Zn-doped TiO₂ nanocrystalline thin films as a photoelectrode, was found to be around 1.22%.     

Ellipsometric control of the parameters of lead selenide films during oxidation

The changes in the optical characteristics of lead selenide thin films with different degrees of oxidation are investigated using ellipsometry. It is found that, as the degree of oxidation increases, the refractive index, the optical thickness, and the extinction coefficient of lead selenide films decrease monotonically, whereas the effective film thickness increases. The composition of the films can be determined from the measured refractive index at a wavelength λ = 632.8 nm with the use of the dependences calculated on the basis of the single-layer model.     

二氧化钛薄膜制备工艺的研究进展

二氧化钛薄膜是一种具有光、电特性的廉价的半导体材料，近年来受到研究人员的广泛关注，二氧化钛薄膜的这些特殊性能使其应用于诸多领域。不同的制备工艺可以得到性能不同的二氧化钛薄膜，使其适用于相关领域。简要叙述了二氧化钛薄膜的基本特性及应用，主要介绍了电化学法、溅射法、溶胶-凝胶法和水解沉淀法等二氧化钛薄膜制备工艺的原理、研究现状和优缺点，并根据各工艺的不足，指出了今后的发展趋势。     

TiO2光诱导亲水薄膜的制备及其亲水性研究现状

对具有光诱导亲水性的TiO2薄膜的制备工艺及其研究现状进行了评述.主要介绍了TiO2亲水薄膜常用的和具有开发潜力的制备工艺,总结了人们对其亲水机理的认识过程以及有代表性的亲水理论,讨论了改善TiO2薄膜亲水性的各种方法.根据国内外的研究和应用现状,提出亲水性氧化钛薄膜今后的发展方向.     

Characterization of Doped Amorphous Silicon Thin Films through the Investigation of Dopant Elements by Glow Discharge Spectrometry. A Correlation of Conductivity and Bandgap Energy Measurements

The determination of optical parameters, such as absorption and extinction coefficients, refractive index and the bandgap energy, is crucial to understand the behavior and final efficiency of thin film solar cells based on hydrogenated amorphous silicon (a-Si:H). The influence of small variations of the gas flow rates used for the preparation of the p-a-SiC:H layer on the bandgap energy, as well as on the dopant elements concentration, thickness and conductivity of the p-layer, is investigated in this work using several complementary techniques. UV-NIR spectrophotometry and ellipsometry were used for the determination of bandgap energies of four p-a-SiC:H thin films, prepared by using different B(2)H(6) and SiH(4) fluxes (B(2)H(6) from 12 sccm to 20 sccm and SiH(4) from 6 sccm to 10 sccm). Moreover, radiofrequency glow discharge optical emission spectrometry technique was used for depth profiling characterization of p-a-SiC:H thin films and valuable information about dopant elements concentration and distribution throughout the coating was found. Finally, a direct relationship between the conductivity of p-a-SiC:H thin films and the dopant elements concentration, particularly boron and carbon, was observed for the four selected samples.     

纳米二氧化钛薄膜的制备技术

纳米二氧化钛薄膜是一种功能性薄膜,在环境保护、抗菌自洁、表面防雾等领域有着广阔的应用前景。论述了纳米TiO2薄膜制备技术的最新研究进展。简要陈述了薄膜的改性技术和在实际应用中存在的问题,并展望了今后TiO2薄膜制备技术的发展方向。