碳掺杂TiO2纳米纤维光学带隙的裁剪

Javeria Arshad, Muqarrab Ahmed, Nadia Anwar, Shaheen Irfan, Nazia Iram, Ghazi Aman Nowsherwan, Rabia Khalid, Bushra Anwar, Fouzia Anwar
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摘要

该研究旨在通过掺杂碳来增强二氧化钛(TiO2)的可见光活性,从而减少其有效带隙。采用简单的静电纺丝法合成了碳掺杂TiO2纳米纤维。然后对制备的样品进行表征以研究其性质。x射线衍射(XRD)分析证实了纳米纤维中存在金红石相的TiO2。在合成过程中使用的最高温度下,XRD谱图显示出最大的峰强度,表明温度影响了纳米纤维的晶体结构。利用扫描电子显微镜(SEM)对纳米纤维的形貌进行了观察。结果表明,随着温度的升高,纳米纤维的直径减小。XRF (x射线荧光)结果表明了碳掺杂TiO2纳米纤维的原子组成。采用紫外可见光谱法评价了碳掺杂TiO2纳米纤维的光学性能。结果表明,光学波段向可见光区域偏移。此外,碳的掺杂降低了有效带隙,从而提高了TiO2材料的可见光活性。这些结果对碳掺杂TiO2纳米纤维在光催化和太阳能转换等各个领域的潜在应用具有重要意义。
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Tailoring of optical band gap in carbon-doped TiO2 nanofibers
The study intended to enhance the visible light activity of titanium dioxide (TiO2) by doping it with carbon, thereby reducing its effective band gap. Carbon-doped TiO2 nanofibers were synthesized using a simple electrospinning process. The prepared samples were then characterized to investigate their properties. X-ray diffraction (XRD) analysis confirmed the presence of the rutile phase of TiO2 in the nanofibers. The XRD pattern exhibited maximum peak intensity at the highest temperature used during synthesis, indicating that the temperature influenced the crystalline structure of the nanofibers. Scanning electron microscopy (SEM) was conducted to examine the morphology of the nanofibers. The results revealed that as temperature increased, the diameter of the nanofibers decreased. The XRF (X-ray Fluorescence) results indicate the atomic composition of carbon-doped TiO2 nanofibers. UV–vis spectroscopy was performed to evaluate the optical properties of the carbon-doped TiO2 nanofibers. The results demonstrated a shift of the optical band towards the visible region. Moreover, the carbon doping reduced the effective band gap, resulting in improved visible light activity of the TiO2 material. These results have significant implications for potential applications of carbon-doped TiO2 nanofibers in various fields, such as photocatalysis and solar energy conversion.
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