静电纺丝技术制备TiO_2/SiO_2复合中空纳米纤维与表征

Preparation and characterization of TiO_2/SiO_2 composite hollow nanofibres via an electrospinning technique

用静电纺丝技术成功制备出复合中空TiO2/SiO2纳米纤维。用动态热分析仪、红外光谱仪、X射线衍射仪、扫描电镜、透射电镜和X射线能谱仪等分析技术对样品进行了表征。分析结果表明,得到的产物为复合中空TiO2/SiO2纳米纤维,以非晶SiO2为外壳,内壁由粒径为50 nm的晶态TiO2粒子组成,复合中空纳米纤维平均直径2μm,长度>100μm。讨论了复合中空纳米纤维的形成机制,复合纤维在烧结过程中,芯层TiO2纳米粒子向外表面扩散,与壳层SiO2粒子形成新化学键,得到复合中空纳米纤维。

The hollow TiO2/SiO2 composite nanofibres were successfully synthesized via an electrospinning technique. The samples were studied by TGA-DTA, FTIR, XRD, SEM, TEM and EDS. The results indicate that the outer-wall of the as-prepared TiO2/SiO2 nanofibres is amorphous SiO2 and the inner-wall is composed of TiO2 nanoparticles of 50 nm in diameter. The composite hollow nanofibres are 2 μm in the mean diameter and greater than 100μm in length. Their formation mechanisms were also discussed. During the calcination of composite fibres, the TiO2 nanoparticles are diffused from the core toward the inner surface, new bonds are formed between TiO2 nanoparticles and SiO2 shell, and composite hollow nanofibres are finally obtained.