School of Materials Science and Technology, China University of Geosciences Beijing (CUGB), 29 Xueyuan Rd, Haidian district, Beijing 100083, China.
Nanoscale Res Lett. 2013 Dec 30;8(1):548. doi: 10.1186/1556-276X-8-548.
TiO2-based nanofibers were synthesized using a sol-gel method and electrospinning technique. The as-spun composite fibers were heat-treated at different temperatures (500°C, 550°C, 600°C, and 650°C) and atmospheres (ammonia and nitrogen) for 4 h. The fibers had diameters of 50 to 200 nm and mainly featured anatase and rutile phases. The anatase phase decreased and the rutile phase increased with increasing temperature. Different nitrogen conditions exerted minimal effects on the TiO2 crystalline phase. Different nitriding atmospheres during preservation heating yielded various effects on fibers. The effect of nitrogen in ammonia atmosphere is better than that in nitrogen atmosphere. The fibers heat-treated at 600°C and subjected to preservation heating in NH3 showed high photocatalytic activity.
基于 TiO2 的纳米纤维是采用溶胶-凝胶法和静电纺丝技术合成的。所纺的复合纤维在不同温度（500°C、550°C、600°C 和 650°C）和气氛（氨和氮）下进行 4 小时热处理。纤维的直径为 50 至 200nm，主要为锐钛矿和金红石相。随着温度的升高，锐钛矿相减少，金红石相增加。不同的氮条件对 TiO2 晶相的影响很小。在保存加热过程中使用不同的氮化气氛对纤维有不同的影响。在氨气氛中的氮的效果优于在氮气氛中的效果。在 600°C 下热处理并在 NH3 中进行保存加热的纤维表现出高的光催化活性。
