一维TiO_2纳米材料的微观形态与结构的控制

Control of microscopic morphology and structure of one dimensional titanium dioxide nanomaterials

采用水热法在不同温度下制备了TiO2一维纳米材料,并对其进行了微观形态和晶体结构研究.结果表明,通过控制系统的温度和压力可以分别得到TiO2纳米微粒、纳米管和纳米带.纳米管和纳米带材料具有不同于金红石和锐钛矿型的锐钛矿和钛酸的混合结构;将产物在500℃下热处理后,纳米管/带完全转变为锐钛矿型结构.

One dimensional nanostructure materials of TiO2 were successfully synthesized by hydrothermal method. Their microscopic morphologies and crystal structures were investigated with scanning electron microscope (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD) techniques. It is found that the TiO2 nanoparticles, nanotubes and nanoribbons could be formed under different temperatures and pressures. The XRD data confirmed that the obtained nanotubes and nanoribbons exhibited new crystallographic structures which were different from those of rutile and anatase. Analysis showed that they were the mixture of anatase TiO2 and trititanate. After the nanotubes and nanoribbons were annealed at 500°C for 1 hour, their crystallographic structures all changed to anatase.