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首页> 外文会议>International Conference on Advanced Ceramics and Composites >X-RAY DIFFRACTION STUDY ON THE IN-SITU CRYSTALLISATION KINETICS IN ELECTROSPUN PVP/TiO_2 NANOFIBERS
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X-RAY DIFFRACTION STUDY ON THE IN-SITU CRYSTALLISATION KINETICS IN ELECTROSPUN PVP/TiO_2 NANOFIBERS

机译：电纺PVP / TiO_2纳米纤维原位结晶动力学的X射线衍射研究

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摘要

Nanostructured TiO_2 has received much attention recently owing to their promising physical properties for photocatalytic applications. The process of photocatalysis is closely related to the electronic band gap which is controlled by shape, surface area and particle size. Elongated structures such as nanofibres are of particular importance because they can provide a high specific surface area for photocatalysis. In this paper, the effect of atmosphere and doping on the crystallisation kinetics of electrospun TiO_2 nanofibers has been investigated using high-temperature synchrotron radiation diffraction. Electrospun TiO_2 nanofibers were synthesized using titanium isopropoxide, poly (vinyl-pyrrolidone) as a polymer binder, and acetic acid and ethanol as a solvent. Diffraction results showed that the as-synthesized TiO_2 nanofibres were amorphous initially but when heated in air they crystallized to form anatase and rutile at 600 °C and 700 °C respectively. However, in argon atmosphere, anatase and rutile formed simultaneously at 700 °C. In the presence of vanadium dopant, both anatase and rutile formed in concert at 500 °C. The effects of atmosphere and doping on the crystallisation kinetics and phase stability of TiO_2 nanofibres at elevated temperature are discussed.
机译：纳米结构的TiO_2一直备受关注最近由于其有前途的光催化应用的物理性能。光催化过程密切相关的是由形状，表面积和粒径控制的电子带隙。细长结构如纳米纤维是特别重要的，因为它们可以提供一种用于光催化高的比表面积。在本文中，利用高温同步加速器辐射衍射研究气氛和掺杂对静电的TiO_2纳米纤维的结晶动力学已经效果。电的TiO_2纳米纤维使用异丙氧基钛，聚（乙烯基 - 吡咯烷酮）作为聚合物粘合剂，以及乙酸和乙醇作为溶剂合成。衍射结果表明，所合成的纳米纤维的TiO_2最初无定形，但是当在空气中加热它们结晶在600℃和700℃下分别以形成锐钛矿和金红石。然而，在氩气氛下，锐钛矿和金红石，在700同时形成℃。在钒掺杂剂的存在下，形成在音乐会在500℃锐钛矿和金红石。讨论的气氛和掺杂对在升高的温度下的TiO_2纳米纤维的结晶动力学和相稳定性的影响。

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