共查询到18条相似文献,搜索用时 203 毫秒
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采用溶胶-凝胶法在普通玻璃衬底上制备了不同Fe3+掺杂量的TiO2薄膜.通过X射线光电子能谱仪(XPS)、X射线衍射仪(XRD)、场发射扫描电子显微镜(SEM)、UV-Vis-NIR3600型紫外-可见分光光度计、CA-XP150型水接触角测试仪研究了不同Fe3+掺杂量对TiO2薄膜微观结构、表面形貌、光学性能和亲水性能的影响.结果 表明,所制备的不同Fe3+掺杂量的TiO2薄膜均具有锐钛矿结构;随着Fe3+掺杂量的增大,薄膜样品(镀膜玻璃)在可见光区的平均透过率从70.28%降低到61.45%.当薄膜中Fe3+掺杂量为0.25mol%时,薄膜样品具有最佳的亲水性能,在可见光照射120 min后水接触角降到3.2°;在黑暗中放置20 h后水接触角恢复到4.0°. 相似文献
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凝胶热处理方式对Fe-TiO2薄膜表面形态及亲水性能的影响 总被引:1,自引:1,他引:0
实验采用溶胶-凝胶法,以聚乙二醇(PEG)为致孔剂制备了仿生的Fe3+掺杂TiO2(Fe- TiO2)多孔薄膜。应用TG-DSC分析了凝胶薄膜的热分解行为,采用SEM、XRD及接触角测定仪等分析测试手段分别考察了两种热处理方式对形成薄膜的表面形态、相态以及亲水性的影响。结果表明:由恒温方式处理得到的薄膜连续无裂纹,其表面形成了分布均匀的、直径2~5 μm的球面形气孔,而升温方式得到的薄膜其表面形成了分布均匀的、直径约100 μm的葵花状斑块;溶胶不经陈化得到的薄膜为无定形,而经80 ℃、8 h陈化后制备的薄膜为锐钛型;采用Fe3+掺杂及在薄膜表面形成气孔,能显著提高TiO2薄膜的亲水性,并且恒温热处理方式得到的薄膜其亲水性优于升温方式得到的薄膜样品。 相似文献
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低温制备纳米晶TiO2薄膜及其光催化性能 总被引:11,自引:3,他引:8
以无机盐TiOSO4、氨水、H2O2为原料,通过沉淀、胶溶、络合、回流等步骤制备了含有锐钛矿晶粒的回流溶胶(refluxed sol,RS).以RS为前驱体在玻璃基片上用红外灯100 ℃干燥,在低温下制备了纳米TiO2薄膜,采用X射线衍射、热重、扫描电镜、紫外可见光吸收光谱等测试手段对TiO2薄膜进行了表征.结果表明:低温制备的TiO2薄膜呈透明状,在可见光下透光率超过80 %,附着力良好,薄膜表面均匀分布着球形锐钛矿晶粒,晶粒粒径随回流时间延长而增加.以10 mg/L甲基橙为降解对象,考察了TiO2薄膜的光催化性能,由100 ℃回流6 h的RS-6溶胶制备的TiO2薄膜光催化性能最好,120 min内甲基橙脱色率达到99%以上,说明采用RS前驱体制备的TiO2薄膜光催化性能良好. 相似文献
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采用胶体晶体薄膜为模板,利用溶胶–凝胶法制备了钇掺杂有序多孔TiO2薄膜,通过Fourier变换红外光谱、扫描电子显微镜、X射线衍射、X射线光电子能谱、紫外–可见光谱表征样品的结构和形貌,并以甲基橙为模型化合物研究了钇掺杂有序多孔TiO2薄膜材料可见光催化性能。结果表明:钇掺杂有序多孔TiO2薄膜规整致密,晶型为锐钛矿型,样品中钇元素含量约为1.2%。钇掺杂使得TiO2吸收光红移至可见光区,钇掺杂有序多孔TiO2薄膜可见光催化性能好于未掺杂有序多孔TiO2薄膜。 相似文献
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基于提高TiO2薄膜的光学属性和着色效率,以钛酸四丁酯和氧化镧为主要原料,采用溶胶-凝胶法,在ITO玻璃表面制备La3+掺杂TiO2薄膜.通过XRD、SEM、EDS、TG-DTA等手段对制备La3+掺杂TiO2凝胶粉末进行表征,使用电化学工作站CHI660E和紫外-可见光分光光度计UV-5500PC对La3+掺杂TiO2薄膜的电致变色性能进行测试.结果表明:凝胶在加热的过程中发生一系列的物理和化学反应,且当温度升高至400 ℃时,系统达到相对热稳定状态.经600℃热处理,La3+掺杂TiO2转化为金红石相.外加电压为-2V时,薄膜显示为深蓝色,反向施压至+2V时,蓝色褪去.金红石相TiO2无定形程度随La3+掺入量增加而提高,对应其着色效率提高.La3掺杂TiO2薄膜在可见光范围内透过率均在70% ~ 80%,光学性能良好. 相似文献
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用溶胶-凝胶法在石英基材上制备了纳米二氧化钛(TiO2)薄膜.用射频等离子体修饰TiO2薄膜.提出了射频等离子体使TiO2对光谱响应红移的修饰方法.X射线衍射分析结果表明:TiO2被等离子体修饰后仍然保持锐钛矿晶型.紫外-可见光谱分析结果表明:放电功率为400W时,TiO2薄膜的吸收边向可见光红移.Fourier变换红外光谱表明:等离子体修饰使TiO2薄膜的亲水性增强.电子自旋共振的结果表明:被修饰薄膜中Lande因子g=2.000 3处氧空位俘获的电子的信号明显增强.放电功率为400W时,结晶紫溶液的光降解实验表明:等离子体修饰的TiO2的光催化活性较好. 相似文献
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通过采用溶胶一凝胶法制备了稳定的TiO2溶胶,在此基础上制备了Al^3+,Zn^2+,Cu^2+等金属离子氧化物掺杂的复合TiO2薄膜。采用X射线衍射、紫外一可见分光光度计以及NKD-7000W薄膜分析系统对所得薄膜晶相组成、光学性质以及禁带宽度等进行了表征。结果表明,这些金属氧化物与TiO2的复合薄膜体系中,形成了单一的锐钛矿相TiO2,与纯TiO2薄膜相比,复合薄膜中TiO2纳米粒子平均尺寸在一定程度上减小了。同时,复合TiO2薄膜的光学透过率以及光学禁带宽度均随着添加量的增加而规律性变化。 相似文献
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采用溶胶-凝胶法分别制备了TiO2/ZrO2、TiO2/ZrTiO4、TiO2/SiO2等异质结构纳米薄膜.本文对形成溶胶的各成分配比、粘度以及薄膜样品的热处理工艺等进行了探讨,同时用喷涂法在瓷砖上成功制备光催化薄膜,用SEM对薄膜的外貌特征进行了表征,并利用紫外-可见分光光度计研究了薄膜吸收光谱的变化,用分光光度法研究了异质结构薄膜对甲基橙溶液的降解,探讨了过渡层对薄膜的光催化效率和抗失活稳定性的影响.结果表明,TiO2/ZrO2、TiO2/ZrTiO4薄膜中的晶粒尺寸减小,薄膜的光催化活性和抗失活稳定性均有较大提高,并可以用工厂方法制备大面积薄膜. 相似文献
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Kiyoharu Tadanaga Noriko Katata Tsutomu Minami 《Journal of the American Ceramic Society》1997,80(12):3213-3216
Alumina thin films with a roughness of 20 to 50 nm were formed by immersing porous alumina gel films prepared by the sol-gel method in boiling water. When hydrolyzed fluoroalkyltrimethoxysilane was coated on the alumina films, the contact angle for water was increased with an increase of immersion time, and immersion for 30 s was long enough to give super-water-repellency and high transparency; the contact angle for water of the film was 165° and the transmittance for the visible light was higher than 92%. It was found that the surface of the alumina gel films immersed in boiling water consisted of boehmite crystals. It was shown that the existence of air in the hydrophobic pores on the surface caused the super-water-repellency. 相似文献
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文章采用溶胶-凝胶法在玻璃基底上制备得到了高透光率,高导电性的掺铝氧化锌薄膜(AZO),利用原子力显微镜、扫描电镜、X射多次退火的制备过程不仅可以得到可见光区透光率大于85%,电阻率为7.2×10-5Ω·m的透明导电薄膜,而且因省略了热处理过程而简化了制备工艺,缩短了制膜时间。线衍射仪和紫外可见分光光度计等研究了三种不同的制备过程对AZO性质的影响。结果表明,制备过程的不同导致了薄膜的表面形貌、结构和导电性质方面的差别,其中分层多次退火过程有利于晶粒长大,形成结晶度高且具有单一(002)取向的AZO薄膜,同时改善薄膜的导电性能。分层 相似文献
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Jianqiao Huang Xinyu Zhang Gerassimos Orkoulas Panagiotis D. Christofides 《Chemical engineering science》2011,66(23):5955
This work demonstrates the use of feedback control, coupled with a suitable actuator design, in manufacturing thin films whose surface morphology is characterized by a desired visible light reflectance/transmittance level. The problem is particularly important in the context of thin film manufacturing for thin film solar cells where it is desirable to produce thin films with precisely tailored light trapping characteristics. Initially, a thin film deposition process involving atom adsorption and surface migration is considered and is modeled using a large-lattice (lattice size=40,000) kinetic Monte Carlo simulation. Subsequently, thin film surface morphology characteristics like roughness and slope are computed with respect to different characteristic length scales ranging from atomic to the ones corresponding to visible light wavelength and it is found that a patterned actuator design is needed to induce thin film surface roughness and slope at visible light wavelength spatial scales, which lead to desired thin film reflectance and transmittance levels. Then, an Edwards–Wilkinson-type equation (a second-order stochastic partial differential equation) is used to model the surface evolution at the visible light wavelength spatial scale and form the basis for the design of a feedback controller whose objective is to manipulate the deposition rate across the spatial domain of the process. The model parameters of the Edwards–Wilkinson equation are estimated from kinetic Monte Carlo simulations and their dependence on the deposition rate is used in the formulation of the predictive controller to predict the influence of the control action on the surface roughness and slope throughout the thin film growth process. Analytical solutions of the expected surface roughness and surface slope at the visible light wavelength spatial scale are obtained by solving the Edwards–Wilkinson equation and are used in the control action calculation. The cost function of the controller involves penalties on both surface roughness and slope from set-point values as well as constraints on the magnitude and rate of change of the control action. The controller is applied to the large-lattice kinetic Monte Carlo simulation. Simulation results demonstrate that the proposed controller and patterned actuator design successfully regulate aggregate surface roughness and slope to set-point values at the end of the deposition that yield desired levels of thin film reflectance and transmittance. 相似文献
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采用两种不同的酸碱复合催化方法制备SiO2增透膜,对该增透膜的透过率、表面形貌、硬度等进行了比较.第一种方法是滴加HCl制备薄膜,与酸催化法制备的薄膜相比,透光率有所提高,但薄膜表面不均匀,影响了薄膜的透光率;第二种方法是滴加酸溶胶制备薄膜,其透过率高,薄膜硬度大,且薄膜表面颗粒均匀平整.采用红外光谱,XRD和SEM等手段对两种方法制备薄膜的结构和表面形貌进行了表征,结果表明,滴加酸溶胶法得到的薄膜性质更稳定,透光率、强度等指标也最优. 相似文献