Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan.
ACS Appl Mater Interfaces. 2009 May;1(5):1140-3. doi: 10.1021/am9001474.
We report herein a simple procedure for the fabrication of TiO2 nanofibers by the combination of electrospinning and sol-gel techniques by using poly(vinylpyrrolidone) (PVP), titanium(IV) butoxide, and acetylacetone in methanol as a spinning solution. TiO2 nanofibers (260-355 nm in diameter), with a bundle of nanofibrils (20-25 nm in diameters) aligned in the fiber direction, or particle-linked structures were obtained from the calcination of as-spun TiO2/PVP composite fibers at temperatures ranging from 300 to 700 degrees C. These nanofibers were utilized as photocatalysts for hydrogen evolution. The nanofiber photocatalyst calcined at 450 degrees C showed the highest activity among the TiO2 nanofibers tested such as ones prepared by the hydrothermal method and anatase nanoparticles (Ishihara ST-01). These results indicate that one-dimensional electrospun nanofibers with highly aligned bundled nanofibrils are beneficial for enhancement of the crystallinity, large surface area, and higher photocatalytic activity.
我们在此报告了一种通过静电纺丝和溶胶-凝胶技术相结合，使用聚（乙烯基吡咯烷酮）（PVP）、钛（IV）丁氧基和乙酰丙酮在甲醇中作为纺丝溶液来制备 TiO2 纳米纤维的简单方法。TiO2 纳米纤维（直径为 260-355nm），在纤维方向上排列着纳米纤维束（直径为 20-25nm），或由在 300 至 700 摄氏度范围内煅烧的纺丝 TiO2/PVP 复合纤维得到的颗粒连接结构。这些纳米纤维被用作光催化剂以促进氢气的产生。在 450°C 下煅烧的纳米纤维光催化剂在测试的 TiO2 纳米纤维中表现出最高的活性，例如通过水热法制备的和锐钛矿纳米颗粒（Ishihara ST-01）。这些结果表明，具有高度取向的束状纳米纤维的一维静电纺纳米纤维有利于提高结晶度、增大表面积和提高光催化活性。
