Qinyuan ZHANG
,
Guangming WU
,
Bin ZHOU
,
Jun SHEN
,
Jue WANG
,
Zhonggang WU
,
Xiaohong JI
材料科学技术（英）
Transparent mixed phase (1 - x)V2O5 -xTiO(2) (x=0,0.1,0.2,0.3,0.4) thin films were prepared on indium tin oxide (ITO) coated glass via sol-gel process. The films were characterized by cyclic voltammetry, optical spectroscopy, scanning electron microscopy, IR and X-ray diffractometer. Electrochemical lithium insertion/extraction showed that the porous structure of sol-gel (1 - x)V2O5-xTiO(2) thin films exhibited good recharge ability of Li+/e(-) insertion/extraction process. For a 220 nm thick (1 - x)V2O5-xTiO(2) film with 90% V2O5, the capacity of charge exchange reached 9 mC/cm(2). In both Li+ intercalated and free states, the films were highly transparent to visible light. Such films have potential applications in counter electrodes for electrochromic smart windows and other electrochemical devices.
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Qinyuan ZHANG
,
Zhonghong JIANG
材料科学技术（英）
Two kinds of new Ormosil xerogels derived from GPTMS (3-glycidyl propyl trimethoxisilane) and TEOS (tetraethoxysilane) or GPTMS and Ti(OBu)4 (tetrabutoxytitanate) were synthesized via the sol-gel method as dye laser host. Their optical properties, microstructure characteristics and surface laser damage thresholds have been reported. The effects of dye matrix combination on the fluorescence emission, slope efficiency, photostability and tunable bandwidth were examined. Laser oscillation was easily achieved near 620 nm with a slope efficiency of 29% from DCM doped SiO2-Ormosil pumped by a frequency-doubled radiation from a Q-switched Nd:YAG laser. The laser wavelength was tunable over 59nm, and the laser output energy had only a 10% reduction after 2.5×104 pulses at a pump repetition rate of 1 Hz and a pump intensity of 1 J/cm2.
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