静电纺丝法制备多孔五氧化二钒纳米管

Preparation of porous vanadium pentoxide nanotubes by electrospinning

摘要:

静电纺丝法制备多孔五氧化二钒纳米纤维,在经过后续的高温处理得到多孔洞的五氧化二钒纳米管结构。本文以商用五氧化二钒粉末,苯甲醇和异丙醇为原料制备氧化钒溶胶,添加聚乙烯吡咯烷酮(PVP)以增加前驱体的粘性,并以此为前驱体通过静电纺丝法制备超长五氧化二钒纳米纤维。于是我们得到静电纺丝法制备的五氧化二钒纤维,通过改变热处理的时间来实现对纤维形貌的控制。我们所添加的PVP在整个溶液中的质量分数为10%。使用扫描电子显微镜(SEM)、投射电子显微镜(TEM)以及X射线衍射仪(XRD)来表征所制备的多孔五氧化二钒纳米管的形貌和结晶度。由热重分析仪(TGA)来测试静电纺丝设备制备得到的五氧化二钒纳米纤维的热分解,并以此选择高温处理温度。静电纺丝得到的超长五氧化二钒纳米纤维的直径在400-700纳米间,长度为2-10微米。经过不同时间的高温处理后,所获得结构为不同完整程度的多孔洞五氧化二钒纳米管。

Abstract:

Porous vanadium oxide nanotubes (VNTs) are generated by electrospinning technique and following sintering treatment. In this paper, we choose commercial vanadium oxides and benzyl alcohol and Isopropanol as the raw materials to form low-cost inorganic vanadium sol solution followed the appropriate addition of poly(vinylpyrrolidone) (PVP) as electrospinning vanadium precursor[1]. Thus, we can prepare the one-dimensional (1D) VNTs, which mainly containing V₂O₅-sol and PVP, followed by varying the holding time of sintering. Crystal structure and the morphology of electrospun VNTs are analyzed by using scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). X-ray photoelectron spectroscopy (XPS) also displays carbon remained after PVP sintered. The electrospun VNTs are about 400 - 700 nm in diameter, and 2-10 μm long with various degrees of porous interconnected fibrous morphology which could be seen by SEM and TEM images. And the degrees of the fracture of the porous vanadium pentoxide nanotubes are various with different holding time at high temperature.