TiO_2/α-FeOOH纳米复合材料的微结构及性能研究  

Microstrcture Characterization and Properties of TiO_2/α-FeOOH Nanocomposites

作　　者：王燕飞[1,2] 王卫[3] 郑遗凡[1,4] 李国华[4] 

机构地区：[1]浙江工业大学分析测试中心,杭州310014 [2]天台县质量技术监督局苍山所,台州317200 [3]台州市环境保护局椒江分局,台州318000 [4]浙江工业大学化学工程与材料学院,杭州310014

出　　处：《无机材料学报》2013年第2期177-183,共7页Journal of Inorganic Materials

基　　金：浙江省自然科学基金(Y4080209);浙江省科技计划项目(2007F70039)~~

摘　　要：以TiCl4为前驱体,铁黄(α-FeOOH)为载体,采用水解沉淀法在不同温度下制备了系列TiO2/α-FeOOH纳米复合材料。应用XRD、HRTEM、STEM等方法对样品的物相、形貌、微结构等进行系统表征,采用UV-DRS光谱仪检测其光学性能。结果表明:随着反应温度的升高(30℃→90℃),两相形成的包覆结构先逐渐变的连续,然后再逐渐失去连续性,其中45℃反应合成的TiO2/α-FeOOH包覆结构连续致密;包覆外层是由晶粒细小的金红石相TiO2组成,内层由晶粒较大的针铁矿相(α-FeOOH)组成,金红石连续致密地包覆在α-FeOOH外面;TiO2与α-FeOOH之间形成了稳定的共格结构,部分TiO2生长到α-FeOOH外层,晶格畸变变大,复合结构良好。光学性能测试结果表明,包覆结构良好的复合材料吸收峰红移最大,大大拓宽了光谱响应范围,从而有效提高了对太阳光的利用率。A series of TiO2/α-FeOOH nanocomposites were prepared by hydrolysis precipitation method at different temperatures using TIC14 as Ti source and α-FeOOH as support. The phase composition, morphology, microstructure and optical properties of the samples were investigated by XRD, HRTEM, STEM and UV-DRS. The results show that with the temperature gradually increasing from 30℃ to 90℃, the core-shell structure first gets better and then worse, and the best core-shell structure is formed at 45℃. The shell is composed of fine grains of rutile TiO2 and the large grain of α-FeOOH serves as the core, and the nanocomposites coated continuous and dense The interaction between TiO2 and ct-FeOOH is not only physical adsorption, a coherent lattice structure is formed at the interface between TiO2 and ct-FeOOH, which leads to a large lattice distortion and a good composite structure. UV-DRS results show that the largest red shift of absorption peak is observed for the composite with good core-shell structure, indicating that the TiO2/α-FeOOH nanocomposites can greatly expand the range of spectral response and thus improve the utilization of sunlight.

关 键 词：金红石 铁黄 纳米复合材料 微结构 

分 类 号：O649[理学—物理化学]