溶胶-凝胶法制备TiO_2和掺铁TiO_2及其纳米粒子的局域结构分析  

Local structural investigations on TiO_2 and Fe doped TiO_2 nanoparticles synthesized by sol-gel method

作　　者：姜炳植[1] 金林虎[1] 赵莲花[2] 

机构地区：[1]延边大学理学院物理系,吉林延吉133002 [2]延边大学理学院化学系,吉林延吉133002

出　　处：《延边大学学报（自然科学版）》2012年第2期134-137,共4页Journal of Yanbian University（Natural Science Edition）

摘　　要：采用溶胶-凝胶法分别在500℃和600℃烧结温度下制备了掺铁TiO2,而且在相同条件下制备了纯TiO2.XRD测量结果表明:纯TiO2和掺杂0.07%(摩尔分数)铁的TiO2样品均为锐钛矿相,粒径范围为10～25nm;样品粒径随烧结温度的升高而增大,但是掺铁样品的粒径比相同条件下制备的纯TiO2样品的要小.钛原子K-吸收端的EXAFS分析表明:与纯TiO2样品相比,掺铁TiO2样品的氧配位距离缩小,氧配位数增加,减少了氧空位;在不同烧结温度下制备的掺铁TiO2样品中,铁原子都进入了钛原子位置.Pure TiO2 and 0.07% （mole fraction） Fe doped TiO2 nanoparticles are prepared by sol-gel method at 500 ℃ and 600 ℃ sintering temperature. The results of XRD show that all samples consisted of anatase phase with the sizes ranged in 10-25 nm. Increasing of the sintering temperature leads the larger particle size of the pure TiO2 , meanwhile the Fe doped TiO2 smaller than the pure TiO2 at the same sintering temperature. The EXAFS analysis at Ti K-edge reveal that Ti--O bond length in the Fe doped nanoparticles shrink the oxy- gen coordination length, while the coordination numbers of oxygen increase with oxygen vacancy nearly vanis- hing. At the sintering temperature of 500℃ and 600 ℃, the Fe atoms occupy the titanium sites.

关 键 词：溶胶-凝胶法 掺铁TiO2 EXAFS 

分 类 号：O766.3[理学—晶体学]