Effect of coating layers on nano-TiO2 particles on the preparation of nanocrystalline lambda-Ti3O5 by carbonthermal reduction
Effect of coating layers on nano-TiO2 particles on the preparation of nanocrystalline lambda-Ti3O5 by carbonthermal reduction
复制标题
纳米TiO2颗粒包覆层对碳热还原制备纳米晶λ-Ti3O5的影响
DOI：
10.1007/s10854-016-4285-z
复制
发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Bo Huang
中科院分区：
文献类型：
--
作者：
Dan Wei;Wanxia Huang;Qiwu Shi;Tiecheng Lu;Bo Huang
采用沉淀法合成λ-Ti 3 O 5，制备了3种不同表面包覆条件的金红石型TiO 2纳米粒子。首次研究了金红石型纳米TiO 2表面层对λ-Ti 3 O 5制备的影响。采用X射线衍射、扫描电镜、能谱仪和透射电镜对粉体进行了表征。将金红石型纳米TiO 2粉体分别与炭黑混合，然后在等温加热条件下退火。产物的相结构分析表明，Al 2 O3-SiO2双包覆TiO 2粉体经碳热还原可合成高纯纳米晶λ-Ti 3 O 5粉体，而未经包覆和SiO2包覆的TiO 2粉体则不能合成高纯纳米晶λ-Ti 3 O 5粉体。因此，纳米TiO 2包覆层在λ-Ti 3 O 5纳米晶的形成过程中起到了决定性的作用。结果表明，在TiO 2/C体系的碳热还原过程中，涂层和金属离子（即Al 3+）都起到了稳定介稳相λ-Ti 3 O 5的作用。该研究为纳米晶λ-Ti 3 O 5的制备提供了重要的理论依据。
Three different kinds of rutile TiO2nanoparticles with different surface coating conditions were prepared by precipitation method for synthesizing λ-Ti3O5. The effect of surface layersonnano rutile TiO2particles on the preparation of λ-Ti3O5was firstly investigated. X-ray diffraction, scanning electron microscope, energy dispersive spectrometer and transmission electron microscope were used to characterize these powders. The nano rutile TiO2powders were mixed with carbon black separately and then annealed at an isothermal heat condition. The phase structures of the products demonstrate that high purity nanocrystalline λ-Ti3O5powders can be synthesized by carbothermal reduction of the Al2O3–SiO2dual-coated TiO2powders, but not by the uncoated and SiO2-coated TiO2powders. Thus, the coating layers of the TiO2nanoparticles played adecisiverole in the formation of nanocrystalline λ-Ti3O5. It proposed that both of the coating layers and metal ion (i.e. Al3+) make a contribution to stabilize the metastable phase λ-Ti3O5to ambient temperature in the carbothermal reduction of the TiO2/C system. This study provided considerable insights into the preparation of nanocrystalline λ-Ti3O5.