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吴广明, Kun Xiao*, Guangming Wu, Jun Shen, Debin Xie, Bin Zhou
,-0001,():
-1年11月30日
gel materials has received much significant attention recently as it can be used as highly promising cathodic materials for Li-ionbatteries. A novel kind of V2O5 aerogel materials, ambient dried V2O5 aerogel films were reported in this paper. The films were deposited by thedip-coating method and dipped into acetone and cyclohexane by turn to exchange the solvent in the films. Atomic force microscopy (AFM), X-raydiffraction topography (XRD), ellipsometry, and electrochemical measurements were employed to characterize the aerogel films. The porosity ofthe aerogel films is 56%, 16% higher than that of the xerogel films when dried at 120℃. The aerogel films have the higher capacity, as well asbetter reversibility than those of the xerogel films. The improvement of the capacity can be ascribed to the increase of porosity as well as the porediameters after the solvent exchange.
Thin films, Atomic force microscopy (, AFM), , X-ray diffraction topography (, XRD), , Electrochemical properties
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【期刊论文】Scratch-Resistant Improvement of Sol-Gel Derived Nano-Porous Silica Films
吴广明, JUE WANG, GUANGMING WU, JUN SHEN, TIANHE YANG, QINYUAN ZHANG, BIN ZHOUAND ZHONGSHENG DENG
Journal of Sol-Gel Science and Technology 18, 219-224, 200,-0001,():
-1年11月30日
Scratch-resistance of sol-gel derived nano porous silica films were studied. The thin films were preparedwith a dip-coating method from both one-step and two-step catalyzed silica sols, and treated in a mixture gas ofammonia andwater vapour afterwards. The thin films were characterized by using Atomic Force Microscope (AFM), ellipsometer, Fourier-transform Infrared Spectroscope (FTIR), respectively. Experimental results have shown thatthe two-step catalysis remarkably improves strength of the films, and abrasion-resistance and adhesion of the silicafilms were further increased after the mixture gas treatment. It is attributed to the cross-linking of silica particlesin the sols by randomly branched or/and entangled linear chains and more Si O Si bonds formed by the mixturegas treatment.
sol-gel process,, silica film,, AFM,, refractive index
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吴广明, Guangming Wu a, *, Jue Wang a, Jun Shen a, Tianhe Yang a, Qinyuan Zhang a, Bin Zhou a, Zhongsheng Deng a, Bin Fan b, Dongping Zhou b, Fengshan Zhang b
Materials Science and Engineering B78 (2000) 135-139,-0001,():
-1年11月30日
A relatively new method to adjust refractive index of nano-porous silica films rapidly and continuously is reported. The thinfilms were prepared with the base:acid two-step catalytic sol-gel process and the dip-coating method. The structure, reflectivespectra and refractive index of the films were analyzed with TEM, AFM, SEM, spectrophotometer, and ellipsometery, respectively. The experimental results have shown that the base: acid two-step catalysis can adjust the refractive index of thenano-porous silica films from 1.18 to 1.42 rapidly and continuously. And a broadband antireflective coating made with themethod has very low reflectance. The average reflectance of the coated glass in the solar energy spectrum decreases to 1.5% from 7% of the glass.
Sol-gel process, Silica coatings, Nano-porous structure, Antireflectance
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吴广明, Wu Guangming, Wang Jue, Shen Jun, Yang Tianhe, Zhang Qinyuan, Zhou Bin, Deng Zhongsheng
,-0001,():
-1年11月30日
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.
Sol-Gel Process, Silica Films, Anti-reflectance, Nano Porous Structure
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吴广明, Guangming Wu a, *, Jue Wang a, Jun Shen a, Tianhe Yang a, Qinyuan Zhang a, Bin Zhou a, Zhongsheng Deng a, Fan Bin b, Dongping Zhou b, Fengshan Zhang b
,-0001,():
-1年11月30日
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.
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