A strengthening mechanism for sol-gel derived nano-porous silica flms was studied. The silica flms were preparedwith the dip method from two-step catalyzed silica sols and treated in a mixed atmosphere of ammonia and water vaporafterwards. Properties of the flms were analyzed by using atomic force microscopy (AFM), Fourier-transform infraredspectroscopy (FTIR), ellipsometry and an abrasion test, respectively. The experimental results have shown that the twostepcatalysis strengthens the flms and the scratch resistance of the silica flms is further improved after treatment in themixed gas. The increase in strength is attributed to the cross-linking of silica particles by randomly branched or/andentangled linear chains in the sols, more Si-O-Si bonds formed by the mixed gas treatment and structural changes inthe silica flms.

采用溶胶-凝胶技术，结合二步水解法分别在单晶硅片、石英玻璃和K9玻璃上制备SiO2-TiO2纳米复合薄膜，采用高压汞灯对其进行紫外光处理，分别用AFM、椭偏仪、FTm、uv-vis分光光度计以及xRD对凝胶膜紫外光处理前后的光学性能和结构进行研究，并与传统的热处理进行比较与分析。研究表明，紫外光处理是实现凝胶膜低温致密化的有效方法之一，其致密化的机理不同于传统的热处理，主要是通过紫外高能光子诱导复合薄膜网络结构的原子中的电子激发，导致原子化学键的断裂，进而产生结构重组而致密化。

When designing a cut-off interference filter, extra layers are needed to add on each side of periodicsymmetrical multilayer to match the incident medium and the substrate. In this paper, we use sol-gel film withadjustable refractive index as the match layer. The influence of the refractive index and thickness of the matchlayer on the film system is discussed in detail. As an example, a special filter which is transparent (>80%) at thewavelength 3-5μm and high reflective (>90%) at the wavelength 1.3μm is designed. Finally a series of optimizedfilm parameters are presented. The whole design process is a good reference to the other multilayer special filtermade by sol-gel process.

Vanadium pentoxide films were prepared by evaporation followed by annealing posttreat-ment in 02 atmosphere. Lithium was inserted electrochemically from an electrolyde into vana-dium pentoxide films so that Li, V205 was formed. The structure of the posttreated sampleswas determined by XRD and infrared reflectance was measured by FTIR for as-grown andlithiated films, respectively. The experimental results have shown that V2Os thin films havesome infrared absorption peaks located at 982, 824, 527 and 504cm-1, and the infrared vibra-tion bands corresponding to the peaks have a good agreement with the analysis by Abello et al.for polycrystaliine V205, and there is a obvious influence of lithium insertion on the infraredvibration properties which may be reconciled with the lattice change such as expansion andcontraction.

采用溶胶一凝胶技术，以钛酸丁酯Ti（0c4H2）、v2O5粉末为原材料制备了纳米结构的Ti呸。v2O5复合薄膜。使用XRD、AFM、UV-ⅥS-NIR分光光度计等方法研究了v2O5对TiO2纳米复合薄膜性能的影响。实验结果表明：v20s掺杂使复合薄膜表面颗粒尺寸增加，但仍具有纳米孔洞结构；随v205含量的增加，TiO2晶相由锐钛矿向金红石的转变率大大提高，使金红石完全转变温度降低了200℃左右；复合薄膜在紫外区域的吸收显著增强，吸收边缘发生了红移。复合薄膜定域态宽度随v2ck含量的增加而增加；光学带隙随v2O5的含量增加而减小。