Hydrophobic organic-inorganic silica hybrid films were prepared by means of a two-step acid-catalyzed methodand sol-gel process using surfactant as template. Methyltriethoxysilane(MTES) and tetraethoxysilane(TEOS) wereco-hydrolyzed in different molar ration and were used as precursors. Addition MTES in TEOS precursors produces adecrease of Si-OH and Si-O- surface content. The infrared spectra of the films thus obtained indicated that they becomehydrophobic with the introduction of the methyl groups. Contact angle instrument was also used to supplement the result.Contact angle values for hydrophobic hybrid films are greater than120 degree. The refractive indices and thickness ofhydrophobic hybrid films are about 1.22-1.24 and about 270-300nm The Optical transmittance spectra and mechanicalintensity measurement results showed that the films have good optical and mechanical properties.

The influence of lithium intercalation on the optical absorption of vanadium pentoxide films is reported in this paper. Thin films wereprepared by thermal evaporation followed by annealing in air. Lithium was inserted electrochemically so that LixV2O5 (0≤x≤0.54) wasobtained. The pristine and lithium inserted films were characterized by X-ray diffraction (XRD), optical spectroscopy, and ellipsometry. Theoptical absorption coefficient was calculated from measured normal transmittance and reflectance spectra. XRD analysis has shown that theas-grown V2O5 films were amorphous, becoming microcrystal after annealing at 350℃. The optical absorption spectra of all the samplesexhibited two distinct regions of behavior: at high-energy where (ahm)1/2 varied linearly with the photonic energy hm, and a low-energy tail.The blue shift of the optical absorption edge is attributed to the Fermi level going into the conduction band after lithium insertion, and therelation between the change of the optical gap and the inserted electron concentration is interpreted in terms of a Burstein-Moss shift. Theresults confirm that the anodic electrochromism of V2O5 thin films is due to the blue shift of the absorption edge, and the near-infraredcathodic electrochromism arises from absorption of small polarons in V205.

new method to strengthen nano porous broadband anti-reflectance (AR) silica films is described. Silicasols were made from TEOS with a base/acid two-step catalytic process. Properties of silica films deposited witha dip-coat method are characterized with AFM, SEM, spectrophotometer and abrasion test. Experimental resultsshow that the average reflectance ofa glass coated with the nano porous silica films is less than 1% in the visibleregion; and that the two-step catalysis obviously strengthens the films. Finally, the strengthening mechanism ofthe films is discussed.

To control structure of nano-porous silica films effectively, a base/acid two-step catalytic sol-gel process was investigated. The nano-porous structure and IR absorption of the thin films were characterized by means of FE-SEM, AFM, SEM, FTIR, and ellipsometry, respectively. The experimental results have shown that the base/acid two-step catalysis can adjust the refractive index of the films from 1.18 to 1.41 rapidly and continuously. With a change of the experimental conditions, the frequency shift of the v4 (TO3) peak of FTIR absorption to a lower wave number indicates a decrease in the average Si-O-Si bridging angle. A reduction of FWHM of the peak reveals a narrow distribution of the Si-O-Si bridging angle. These results suggest that influence of the experimental conditions on the FTIR absorption of the nano-porous silica films is attributed to a change of silica particle shape and state of aggregation of the particles in the films.

在溶胶-凝胶基础上，采用碱酸两步法和浸渍镀膜技术制备出纳米多孔SiO2薄膜，并将该薄膜在空气和氨气与水蒸气的混合气体中热处理。使用透射电子显微镜、原子力显微镜、傅立叶红外光谱仪、椭偏仪、分光光度计等分析了薄膜的特性。实验结果表明：采用碱!酸两步催化法能够明显提高纳米多孔SiO2光学增透薄膜的力学特性，混合气体中的热处理又使其力学性能得到进一步改善。薄膜耐磨等力学性能增强归因于SiO2颗粒间更多的化学键合。在力学性能增强的同时，薄膜折射率仍保持约1.24的较低值，光学增透效果良好，透射率≥99.5%。