用紫外 -可见吸收光谱、动态光散射与透射电镜研究紫外光辐射对 Ti O2 溶胶的影响 ,结果表明 ,光辐射使 Ti O2 溶胶在可见光区的吸收减少 ,紫外区吸收增加 ,吸收带隙增大 .与非光辐射的 Ti O2 溶胶粒子相比 ,光辐射使 Ti O2 溶胶粒子分...用紫外 -可见吸收光谱、动态光散射与透射电镜研究紫外光辐射对 Ti O2 溶胶的影响 ,结果表明 ,光辐射使 Ti O2 溶胶在可见光区的吸收减少 ,紫外区吸收增加 ,吸收带隙增大 .与非光辐射的 Ti O2 溶胶粒子相比 ,光辐射使 Ti O2 溶胶粒子分布均匀且平均粒径减小 ,提高了 Ti O2展开更多
The amorphous V 2O 5 films prepared by vacuum evaporation are unstable and easily dissolved by electrolyte during the electrochromic process, so unfit to make electrochromic materials. We found that the annealed films...The amorphous V 2O 5 films prepared by vacuum evaporation are unstable and easily dissolved by electrolyte during the electrochromic process, so unfit to make electrochromic materials. We found that the annealed films have enhanced stability and electrochromic properties. We studied the microstructural changes during the electrochromic process by Raman spectra and discussed the mechanism for the enhancement. The results indicated that the amorphous films annealed by 400-500℃became polycrystalline and the films contained (V 2O 5)n ordered chains which prevented the films from solution effectively and enhanced the electrochromic characteristics. When colored and decolored, the microstructure of the polycrystalline V 2O 5 films changed inversely. During the cathodic polarization process, Li+inserted into the V 2O 5 crystal cell , formed V-O-Li band, disordered the films and UV absorption of the films blue shifted. On the contrary , during the anodic polarization process, Li +escaped from the crystal cell. The films largely restored .展开更多
TiO 2 nanoparticle film catalysts with different thicknesses were prepared by plasma enhanced chemical vapor deposition(PECVD) method and the surfaces were subsequently treated by TiCl 4 or O 2 plasma. Two kinds of Ti...TiO 2 nanoparticle film catalysts with different thicknesses were prepared by plasma enhanced chemical vapor deposition(PECVD) method and the surfaces were subsequently treated by TiCl 4 or O 2 plasma. Two kinds of TiO 2 films with different surface properties were obtained. Their surface microstructures and energy levels of surface states were tested by AFM, XRD, SPS. The photocatalytic activities of the catalysts were determined via photodegradation experiments of phenol. The results demonstrated that photocatalytic activities of samples whose surface was treated by O 2 plasma were greater than those treated by TiCl 4 plasma. Moreover, photodegradation ratio of phenol during the first hour catalyzed by 0.17 μm thickness TiO 2 nanoparticle film was greater than other samples. Especially, the difference of photocatalytic activities of TiO 2 nanoparticle films treated by TiCl 4 or O 2 plasma was respectively explained by energy band theory.展开更多
TiO2 nanoparticulate films were prepared by means of Plasma-enhanced Chemical Vapor Deposition （PECVD）. By further surface treatment by TiCl4 or O2 plasma, films with dif- ferent surface properties were obtained. It...TiO2 nanoparticulate films were prepared by means of Plasma-enhanced Chemical Vapor Deposition （PECVD）. By further surface treatment by TiCl4 or O2 plasma, films with dif- ferent surface properties were obtained. It was found that treatment by TiCl4 plasma enhanced the amount of Ti3+ suiface state and Ti dislocation of the film, detected by the surface photovoltage spectroscopy, while O2 plasma surface treating enhanced its amount of O2 surface state. It was also indicated by the H2O adsorption experiment that film treated by O2 plasma had larger separation efficiency for photogenerated carriers than the one treated by TiCl4 plasma.展开更多
The dynamic wetting of water spreading on TiO 2 and TiO 2 SiO 2 films prepared by sol gel method and subsequently treated by air plasma and UV irradiation was investigated. Water completely spread on TiO 2 surface wit...The dynamic wetting of water spreading on TiO 2 and TiO 2 SiO 2 films prepared by sol gel method and subsequently treated by air plasma and UV irradiation was investigated. Water completely spread on TiO 2 surface within 3 s and its dynamic contact angles can be expressed by a power law θ d= k(t+a) -n with the n value 0.98. Less than 50%(molar fraction) SiO 2 addition can accelerate the dynamic water spreading rate on the TiO 2 SiO 2 films and the optimum molar fraction of SiO 2 amount corresponding to as annealed, air plasma, and UV irradiation treatment process is 15%, 10% and 20%, respectively.展开更多
文摘用紫外 -可见吸收光谱、动态光散射与透射电镜研究紫外光辐射对 Ti O2 溶胶的影响 ,结果表明 ,光辐射使 Ti O2 溶胶在可见光区的吸收减少 ,紫外区吸收增加 ,吸收带隙增大 .与非光辐射的 Ti O2 溶胶粒子相比 ,光辐射使 Ti O2 溶胶粒子分布均匀且平均粒径减小 ,提高了 Ti O2
文摘The amorphous V 2O 5 films prepared by vacuum evaporation are unstable and easily dissolved by electrolyte during the electrochromic process, so unfit to make electrochromic materials. We found that the annealed films have enhanced stability and electrochromic properties. We studied the microstructural changes during the electrochromic process by Raman spectra and discussed the mechanism for the enhancement. The results indicated that the amorphous films annealed by 400-500℃became polycrystalline and the films contained (V 2O 5)n ordered chains which prevented the films from solution effectively and enhanced the electrochromic characteristics. When colored and decolored, the microstructure of the polycrystalline V 2O 5 films changed inversely. During the cathodic polarization process, Li+inserted into the V 2O 5 crystal cell , formed V-O-Li band, disordered the films and UV absorption of the films blue shifted. On the contrary , during the anodic polarization process, Li +escaped from the crystal cell. The films largely restored .
文摘TiO 2 nanoparticle film catalysts with different thicknesses were prepared by plasma enhanced chemical vapor deposition(PECVD) method and the surfaces were subsequently treated by TiCl 4 or O 2 plasma. Two kinds of TiO 2 films with different surface properties were obtained. Their surface microstructures and energy levels of surface states were tested by AFM, XRD, SPS. The photocatalytic activities of the catalysts were determined via photodegradation experiments of phenol. The results demonstrated that photocatalytic activities of samples whose surface was treated by O 2 plasma were greater than those treated by TiCl 4 plasma. Moreover, photodegradation ratio of phenol during the first hour catalyzed by 0.17 μm thickness TiO 2 nanoparticle film was greater than other samples. Especially, the difference of photocatalytic activities of TiO 2 nanoparticle films treated by TiCl 4 or O 2 plasma was respectively explained by energy band theory.
文摘TiO2 nanoparticulate films were prepared by means of Plasma-enhanced Chemical Vapor Deposition （PECVD）. By further surface treatment by TiCl4 or O2 plasma, films with dif- ferent surface properties were obtained. It was found that treatment by TiCl4 plasma enhanced the amount of Ti3+ suiface state and Ti dislocation of the film, detected by the surface photovoltage spectroscopy, while O2 plasma surface treating enhanced its amount of O2 surface state. It was also indicated by the H2O adsorption experiment that film treated by O2 plasma had larger separation efficiency for photogenerated carriers than the one treated by TiCl4 plasma.
文摘The dynamic wetting of water spreading on TiO 2 and TiO 2 SiO 2 films prepared by sol gel method and subsequently treated by air plasma and UV irradiation was investigated. Water completely spread on TiO 2 surface within 3 s and its dynamic contact angles can be expressed by a power law θ d= k(t+a) -n with the n value 0.98. Less than 50%(molar fraction) SiO 2 addition can accelerate the dynamic water spreading rate on the TiO 2 SiO 2 films and the optimum molar fraction of SiO 2 amount corresponding to as annealed, air plasma, and UV irradiation treatment process is 15%, 10% and 20%, respectively.
