通过静电纺丝技术制备了具有一维纳米结构的SiO2/TiO2纳米复合纤维,基于热碱化学刻蚀技术对其微观形貌进行二次调制,制备出具有较高比表面积的多孔TiO2纳米纤维。TG表征表明550℃以上的焙烧温度才能完全烧掉纳米纤维前驱体中有机物组分,从而得到无机 SiO2/TiO2纳米复合纤维。同时发现,SiO2掺杂可以有效抑制 TiO2高温条件下从锐钛矿相向金红石相的转化,在700℃仍然可以得到结晶较好的纯相 SiO2/TiO2锐钛矿。SEM 表征表明NaOH 热化学处理可以从复合纳米纤维 SiO2/TiO2体相刻蚀掉大部分 Si O 2纳米晶粒,从而制备出多孔TiO2无机纳米纤维,相对未经处理的TiO2纳米纤维,该材料具有更高的比表面积和更加精细的微观结构。
SiO2/TiO2 composite nanofiber with one-dimensional microstructure was prepared through electro-spinning.Then porous TiO2 nanofiber with high specific surface area can be obtained based on hot alkaline chemical etching technique.TG analysis revealed that the organic precursor components can be completely re-moved above 550℃ and thus pure inorganic SiO2/TiO2 nanofiber can be obtained.Meanwhile,it was found that TiO2 phase transition from anatase to rutile can be effectively inhibited by the doping of SiO2 into the bulk of TiO2 .Hence,highly crystallized rutile TiO2 can be gotten at 700℃.SEM characterization showed that most SiO2 can be successfully etched from the bulk of SiO2/TiO2 composite nanofiber and thus high-quality porous TiO2 nanofiber can be formed.Compared with the nanofiber without any treatment,porous TiO2 nanofiber ex-hibited higher specific surface area and better microstructure.
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