TiO_2纳米刺球制备和表征

Synthesis and Characterization of TiO_2 Nano-acanthosphere

采用溶胶-凝胶法制备出球形TiO2纳米粒子,通过离心的方法将TiO2纳米粒子从乙醇中转移到水中.在60℃下,将分散剂聚乙烯吡咯烷酮(PVP)和刻蚀剂NaBH4加入到TiO2纳米粒子水分散体系中,经61h的恒温刻蚀反应,制备出TiO2纳米刺球.此外,该刻蚀方法同样被应用于Au@SiO2@TiO2纳米刺球的制备.用扫描电子显微镜(SEM)、动态光散射(DLS)、透射电镜(TEM)及X射线衍射实验(XRD)等方法对TiO2纳米粒子和Au@SiO2@TiO2纳米粒子及其纳米刺球进行表征,进而探索NaBH4刻蚀TiO2的机理.该刻蚀方法所需的设备和实验步骤相对简单,反应条件温和可控,较易实现大批量的TiO2纳米刺球的合成并且也适用于外壳层为TiO2的复合核壳结构纳米刺球的制备.

The novel synthesis of nano acanthosphere via etching method was developed. The uniform spherical TiO2 nanoparticles were synthesized via sol-gel method,and the prepared TiO2 nanoparticles were centrifuged to he separated from ethanol, followed by dispersing in water,and etching by NaBH4 under PVP protection for 61 h at 60℃ to produce TiO2 nano acanthosphere. In addition, the etching method was also applied to synthesize Au@ SiO2 @TiO2 hybrid nanospheres. By means of SEM, DLS, TEM and XRD methods,the structure and properties of nano-acanthosphere formed from spherical nanoparticles were characterized and the etching mechanism was inquired. The reported etching method is rather facile, its mild and easy controllable reaction condition make it readily up-scalable for fabrication of TiO2/TiO2 outer shell -based hybrid nano-acamhosphere.