LaNiO_3薄膜的制备及其氧敏特性的研究

本文以Ｌａ（ＮＯ_３）_３·６Ｈ_２Ｏ和Ｎｉ（ＮＯ_３）_２·６Ｈ_２Ｏ为配位前驱体,采用柠檬酸为螯合剂,利用溶胶－凝胶法合成了钙钛矿型稀土复合氧化物ＬａＮｉＯ_３薄膜,研究了薄膜的氧敏特性及烧结温度对薄膜氧敏特性的影响。     

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。     

LiCl/SiO2薄膜的制备及湿敏性能

采用溶胶－凝胶工艺,制备了ＬｉＣｌ／ＳｉＯ２多孔薄膜湿敏薄材料,薄膜采用提拉法在氧化铝基片上制成,用ＳＥＭ技术对薄膜的孔结构和表面形貌进行了观察,用ＸＲＤ技术研究了热处理温度对ＬｉＣｌ／ＳｉＯ２凝胶结晶行为的影响,研究了ＬｉＣｌ／ＳｉＯ２薄湿敏特性。     

溶胶一凝胶法制备LiCI／SiO2—AI2O3

采用溶胶－凝胶工艺,将ＬｉＣｌ湿敏组元复合到ＳｉＯ２－ＡＩ２Ｏ３玻璃先驱体中,用的拉法镀膜,经过适当的热处理,可以获得具有纳米结构的良好湿敏特性的ＬｉＣｌ／玻璃基江膜,湿敏特性研究表明该类薄膜制得的传感器可在全湿范围内实现对湿度的测量。     

掺铝钛酸锶薄膜及其与CrOx复合膜的制备及氧敏性能的研究

以ＴｉＣｌ４,ＳｒＣｌ２．６Ｈ２Ｏ为主要原料,采用溶胶－凝胶法制备出掺Ａｌ＾３＋的钛酸锶薄膜,分析了薄膜的表面形貌和晶相组成,并比较了铝含量不同的ＳｒＴｉ１－ｘＡｌｘＯ３－δ薄膜的氧敏性能,实验结果表明：掺摩尔分类为０．０１的铝的钛酸锶薄膜表现出较高的氧敏性,但是,铝的掺入并没有消除钛酸锶薄膜的半导体特在中性气氛附近从ｎ型向ｐ型转变。在此基础上,又合了了ＳｒＴｉ０．９９Ａｌ０．０１Ｏ３－δ－ＣｒＯ     

溶胶-凝胶法制备TiO2-SiO2复合薄膜的波导特性研究

研究了采用溶胶－凝胶法制备的ＴｉＯ２－ＳｉＯ２复合薄膜的波导特性。结果表明随着ＴｉＯ２含量和热处理温度的提高,薄膜的波导损耗增大。ＦＴ－ＩＲ光谱,ＸＲＤ和ＡＦＭ分析表明：这种损耗主要来自于薄膜中的微区不均匀和由于薄膜表面的粗糙度增大而产生的光散射的影响。通过航向光谱计算得到了薄膜的折射率和消光系数和色散关系以及它们与工艺之间的关系。     

氧氯化锆前驱体氧化锆溶胶的制备与研究

探讨了以无机盐氧氯化锆为前驱物,以双氧水为水解促进剂,通过溶胶－凝胶法制备氧化锆溶胶的工艺条件。探讨了双氧水的作用机理,通过研究胶凝过程中双氧水加入量对溶胶粘度－时间关系的影响以及对粒径分布的影响,结合IR、XRD和TEM等测试,讨论了双氧水的作用效果并分析了双氧水加入后溶胶和凝胶的结构、晶型以及溶胶粒子形貌的变化。结果表明,双氧水对于本溶胶体系有效的催化作用,溶胶具有较好地稳定性,是制备氧化锆薄膜的一种经济实用的前驱溶胶。     

非水解溶胶-凝胶法制备TiO2光催化薄膜

以TiCl4为前驱体,无水乙醇为氧供体,聚乙二醇(polyethylene glycol,PEG)为成膜控制剂,通过非水解溶胶-凝胶法制备了TiO2光催化薄膜.应用X射线衍射和热重-差式扫描量热研究了TiO2凝胶在热处理过程中的物相变化.采用场发射扫描电镜和光照甲基橙的降解实验研究了TiCl4浓度和镀膜次数对TiO2薄膜显微结构和光催化活性的影响.结果表明:非水解溶胶-凝胶法制备的TiO2薄膜开始出现金红石相的温度为750 ℃,高于传统水解溶胶-凝胶法制备的薄膜.TiCl4浓度和PEG用量是影响薄膜结构和光催化性能的关键因素.当TiCl4浓度为0.83 mol/L,PEG与TiCl4摩尔比为0.1时,所制备的薄膜是一种晶粒细小且孔隙及孔径分布均匀的多孔膜,这有利于提高薄膜的比表面积,薄膜具有最佳的光催化性能.     

纳米湿敏陶瓷α—Fe2O3—Al2O3—K2O的制备与性能

采用溶胶－凝胶法新工艺制备了不同配比的纳米级α－Ｆｅ２Ｏ３－Ａｌ２Ｏ３－Ｋ２Ｏ复合氧化湿敏陶瓷。ＸＲＤ、ＢＥＴ比表面吸附、Ａｒｃｈｉｍｅｄｅ排水法等手段对系列纳米陶瓷物相及微结构进行了分析表征。湿敏特性测试结果表明：调控各组分摩尔配比为ｒ（Ｆｅ：Ａｌ：Ｋ）＝９０：５：５,可获得全湿区阻－湿特性线性关系良好、感湿灵敏度较高、湿滞小、使用温度范围宽、响应速度较快、性能一致性优的湿敏元件。提出组份间界面     

影响旋转法制备K2O—PbO—SiO2溶胶—凝胶涂层性能的因素

用正硅酸乙酯、醋酸铅和醛酸钾制备了Ｋ２Ｏ－ＰｂＯ－ＳｉＯ２溶胶。溶胶－凝胶涂层用离心法涂覆到平板玻璃上。涂膜玻璃的折射率随溶胶－凝胶涂层中铅含量的增加而提高。讨论了溶胶－凝胶涂层的厚度和均匀性与溶胶粘度和离心转速的关系。     

掺锶对钛酸铅薄膜结晶性能的影响

钛酸锶铅(PST)薄膜是一类重要的铁电薄膜材料.采用溶胶-凝胶法在硅(100)衬底上制备了钛酸锶铅薄膜.利用X射线衍射(XRD)、原子力显微镜(AFM)等表征手段,表征了不同锶掺杂量及不同退火温度对薄膜结晶性能的影响.通过实验发现:锶掺杂对薄膜的微观结构和表面形貌有重要的影响.由XRD谱图发现,随着锶掺入量的增加,Pb 1-xSrxTiO3薄膜中的晶轴比、晶胞体积都逐渐减小,晶化温度降低.通过AFM发现,相同掺锶量的薄膜随着退火温度的升高,结晶性能增强,颗粒增大,粗糙度增加.     

Corrosion inhibition of magnesium by combined zirconia silica sol-gel films

The inhibition of Mg (AZ91D) corrosion by thin sol-gel films was studied. The sol-gel films were prepared by the traditional acid or base-catalyzed hydrolysis and condensation, and finally deposited by dip coating. Two different sol-gel monomers were used: phenyltrimethoxysilane (PTMOS) and zirconium(IV)tetra-1-propoxide (ZrTPO). Films were made of each of the individual monomers and by depositing first a PTMOS film followed by ZrTPO-based film. The corrosion inhibition of the films and their characterization were examined by different methods including potentiodynamic polarization, contact angle measurement, adhesion test, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and electrochemical impedance spectroscopy (EIS).We found that while the ZrTPO-based film did not show a significant corrosion inhibition, the PTMOS-based film provided moderate protection. Interestingly, the combined film exhibited superior corrosion inhibition as compared with the other films.     

TiO_2薄膜光生载流子功效应与光催化性能的关系

主要探讨光生载流子的功效应与光催化性能之间的联系,从光生载流子"功效应"的角度评价TiO2薄膜的光催化活性,为寻找其他的光催化活性评价方法建立相关基础。采用溶胶-凝胶法在普通载玻片上制备了TiO2薄膜,利用X射线衍射、Raman光谱、扫描电子显微镜对TiO2样品进行了表征,并通过对甲基橙降解反应测试了样品的光催化性能。结果表明:TiO2薄膜为锐钛矿结构且结晶良好,颗粒分布均匀,粒径约为80nm。光生载流子功效应通过计算Fermi能级劈裂值发现,Fermi能级劈裂值越大,TiO2薄膜的光催化性能越好,说明Fermi能级劈裂值在光催化活性评价中具有重要作用。     

医用NiTi合金表面溶胶-凝胶法制备含磷TiO2薄膜

采用溶胶－凝胶法在医用NiTi形状记忆合金表面制备了含磷TiO2薄膜，原子力显微镜（AFM）分析表明，薄膜由微米级颗粒堆积而成，薄膜表面均匀平滑，通过阳极极化曲线测试对NiTi合金基体及其表面镀有含磷TiO2膜后在模拟体液中的腐蚀行为进行了研究，结果表明，含磷TiO2膜可作为NiTi合金的表面保护膜,使其抗腐蚀性显著提高，体外生物活性测试表明，含磷TiO2薄膜在模拟体液中能够诱导Ca,P沉积，具有一定的生物活性。     

玻璃负载纳米TiO_2膜的研究

以钛酸丁酯为前驱物,采用溶胶-凝胶法制备了纳米TiO2溶胶,采用浸渍-提拉法在玻璃基片上制备了纳米TiO2膜。通过正交实验,确定了溶胶-凝胶法制备玻璃负载纳米TiO2膜的最佳体积配比为:V(钛酸丁酯)∶V(无水乙醇)∶V(聚乙二醇-400)∶V(三乙醇胺)=5∶20∶5∶6。研究了纳米TiO2/玻璃薄膜的吸光度和透射比。用金相显微镜及扫描探针对TiO2薄膜结构及特征进行了分析。结果表明,得到的TiO2薄膜具有很好的吸收紫外线性能和较高的光透率。有良好的化学稳定性,与玻璃基体具有较强的结合性。     

Photocatalytic activities and specific surface area of TiO<Subscript>2</Subscript> films prepared by CVD and sol-gel method

The photocatalytic activity of CVD grown films shows significant, non-linear (sigmoid-like) dependency on the film thickness. However, the photocatalytic activity of sol-gel grown film is almost independent of the film thickness. The specific surface area of sol-gel grown films is very small, regardless of the film thickness. Conversely, the specific surface area of CVD grown films indicates significant thickness dependency. The specific area and photocatalytic activity were found to show very similar dependencies on the film thickness.     

Controlled Layer-by-Layer Formation of Ultrathin Oxide Films on Silver Island Films for Surface-Enhanced Raman Scattering Measurement

Methods for the controlled deposition of ultrathin metal oxide layers onto silver island films for surface-enhanced Raman scattering (SERS) measurements are reported. Two related deposition techniques are explored for thin film growth: a surface sol-gel method and atomic layer deposition. Both methods exhibit excellent control of the deposited film thickness to atomic level precision while conformally coating the complex structures found in silver island films. Coating of metal oxide films onto silver substrates provides a method for monitoring the distance dependence of SERS enhancements and offers a platform for exploring adsorption and interaction of analytes on dielectric surfaces. Analysis of the distance dependence of the Raman signal with increasing film thickness yields estimated silver particle sizes that are in agreement with microscopy, which is consistent with the layer-by-layer growth mechanism of uniform metal oxide films on the silver substrate. These methods can be easily extended to grow a variety of laminar or mixed metal oxide films for the exploration of interfacial phenomena.     

微流控芯片中TiO2薄膜的低温制备

在玻璃微流控芯片中,在低温条件下以溶胶凝胶法及水热处理法制备TiO2薄膜.考察了溶胶处理方式、水热流速、水热时间等因素对纳米TiO2薄膜的稳定性影响,考察了涂层次数、元素掺杂等因素对微流控芯片的光催化性能的影响.实验结果表明:100 μL/h流速下水热3 h获得的5层纳米TiO2薄膜芯片光催化降解亚甲基蓝,降解率可达到42.9％,且具有较高的稳定性.掺杂Si可以明显提高TiO2薄膜的光催化性能,亚甲基蓝降解率可达97.1％.     

Surface modified nanostructured-TiO<Subscript>2</Subscript> thin films for removal of Congo red

We synthesized nanostructured TiO₂ thin films by the modified sol-gel template method using the polyethylene glycol as filler media. The TiO₂ surface modification for both the thin films, i.e., template and non-template, was done with the ascorbic acid. All the four thin film samples, S1 (TiO₂ (non-template), TiO₂ (template), S3 (S1 modified with ascorbic acid) and S4 (S2 modified with ascorbic acid), were characterized by various analytical methods. Phase evaluation was monitored by the X-Ray diffraction analysis. Moreover, the thin films particle sizes were obtained to be 22.32, 21.20, 14.52 and 16.77 nm, respectively for the samples S1, S2, S3 and S4. The changes in particle size and morphology due to the PEG and ascorbic acid were determined by scanning electron microscopy (SEM). Similarly, thermal gravimetric (TG) and differential scanning calorimetry (DSC) were performed to determine the decomposition behavior of organic compound present in the solid samples. The functional groups were determined by infrared (IR) analysis. The photocatalytic efficiency, as a reference of Congo red, was conducted using all the four samples of TiO₂ thin films. Complete photocatalytic degradation of Congo red was achieved by these samples within 130, 80, 40 and 30 mins of UV illumination.     

LaNiO3缓冲层厚度对Ca0.4Sr0.6Bi4Ti4O15薄膜结构和电性能的影响

利用溶胶–凝胶法在Si（100）衬底上制备了具有（110）取向的LaNiO3薄膜,然后在LaNiO3/Si（100）上制备了Ca0.4Sr0.6Bi4Ti4O15（Ca0.4Sr0.6BTi）薄膜。研究了LaNiO3缓冲层厚度对Ca0.4Sr0.6BTi薄膜结构和电性能的影响。结果表明,当引入LaNiO3厚度为250 ...