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    武素丽

    • 教授     博士生导师   硕士生导师
    • 性别:女
    • 毕业院校:大连理工大学
    • 学位:博士
    • 所在单位:化工学院
    • 学科:应用化学. 精细化工
    • 办公地点:西部校区实验楼E-422
    • 联系方式:13842603107
    • 电子邮箱:wusuli@dlut.edu.cn

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    Monodisperse TiO2 Spheres with High Charge Density and Their Self-Assembly

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    论文类型:期刊论文

    第一作者:Xia, Hongbo

    通讯作者:Wu, SL (reprint author), Dalian Univ Technol, Dept State Key Lab Fine Chem, Dalian, Peoples R China.

    合写作者:Wu, Suli,Su, Xin,Zhang, Shufen

    发表时间:2017-01-01

    发表刊物:CHEMISTRY-AN ASIAN JOURNAL

    收录刊物:SCIE、EI、PubMed

    卷号:12

    期号:1

    页面范围:95-100

    ISSN号:1861-4728

    关键字:crystal growth; ligand effects; self-assembly; solgel processes; titanium

    摘要:Titanium dioxide (TiO2) spheres are potential candidates to fabricate three-dimensional (3D) photonic crystals owing to their high refractive index and low absorption in the visible and near-infrared regions. Here, TiO2 spheres with both high surface charge density and uniform size, which are necessary for the self-assembly of TiO2 spheres, have been prepared by means of sol-gel methods in ethanol in the presence of thioglycolic acid as ligand. Thioglycolic acid, which contains two functional groups, not only acts as coordinating ligand for stabilizing and controlling the growth of TiO2 spheres but also endows the resulting TiO2 spheres with high charge density as based on zeta-potential analysis when the pH of the TiO2 aqueous dispersion was 6.5 or higher. The SEM images illustrate that the diameter of the prepared TiO2 spheres can be tuned from 100 to 300 nm by simply controlling the concentration of H2O. FTIR spectra confirm that thioglycolic acid bonded to the surface of TiO2 spheres through carboxylic groups. As anticipated, the obtained TiO2 spheres could self-assemble to form a 3D opal photonic crystal structure by means of a simple gravity sedimentation method. Then the TiO2 spheres in the 3D opal photonic crystal structure were able to transform into a pure anatase phase by annealing at different temperatures.