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Effects of slight Fe (III)-doping on structural and optical properties of TiO2 nanoparticles
Journal of Sol-Gel Science and Technology ( IF 2.3 ) Pub Date : 2021-09-06 , DOI: 10.1007/s10971-021-05602-1
Rezika Zedek 1 , Hatem Djedjiga 1 , Mohamed Megherbi 1 , Mohammed Said Belkaid 1 , Esidor Ntsoenzok 2
Affiliation  

In this research work, undoped and slight Fe-doped-TiO2 nanoparticles (Fe–TiO2 NPs) were prepared using simple chemical sol–gel method and post-annealing temperature at 550 °C. This method is less expensive, and can be easily implemented. The samples were prepared using titanium (IV) isopropoxide (TTIP) as precursor, and iron sulfate hypetahydrate (FeSO4·7H2O) as doping sources. The crystalline structure, morphological, and optical proprieties were obtained using X-ray diffraction (XRD), scanning electron microscopy (SEM) equipped with energy-dispersive X-ray spectroscopy (EDX), and UV–Vis in mode diffuse reflectance spectroscopy (DRS). XRD result of Fe-doped samples showed a tetragonal structure and the presence of anatase–rutile mixed phase of TiO2. Fe (III) can be easily incorporated in the TiO2 lattice without disturbing the tetragonal system of TiO2. Analysis by UV–Vis in DRS mode reveals improvement in absorption efficiency in the visible range for Fe-doped TiO2. The nanoparticles formation is confirmed by SEM images. These nanoparticles can be used as photoanode in solar cells and photocatalytic activity. Our results show that doping with 1% Fe significantly improved the efficiency of the photo-absorption resulting in the visible shift. This shift is connected to the decrease in TiO2 band gap as measured by using Kabelka–Munk function F(R) and confirmed by the values of Urbach energy. Moreover, the prepared Fe-doped TiO2 samples containing mixtures of anatase and rutile nanoparticles with appropriate proportions, which can be used in solar cell application.



中文翻译:

少量 Fe (III) 掺杂对 TiO2 纳米粒子结构和光学性能的影响

在这项研究工作中,使用简单的化学溶胶-凝胶法和 550 °C 的后退火温度制备了未掺杂和轻微掺杂 Fe 的 TiO 2纳米颗粒(Fe-TiO 2 NPs)。这种方法成本较低,而且很容易实现。样品以异丙醇钛 (IV) (TTIP) 为前驱体,硫酸铁五水合物 (FeSO 4 ·7H 2O) 作为掺杂源。使用 X 射线衍射 (XRD)、配备能量色散 X 射线光谱 (EDX) 的扫描电子显微镜 (SEM) 和 UV-Vis 模式漫反射光谱 (DRS) 获得晶体结构、形态和光学特性。 )。Fe掺杂样品的XRD结果显示出四方结构和TiO 2锐钛矿-金红石混合相的存在。的Fe(III)可在二氧化钛可以容易地并入2晶格不干扰TiO 2的四方晶系2。DRS 模式下的 UV-Vis 分析揭示了 Fe 掺杂 TiO 2在可见光范围内的吸收效率的提高. 通过 SEM 图像确认纳米颗粒的形成。这些纳米颗粒可用作太阳能电池中的光阳极和光催化活性。我们的结果表明,掺杂 1% 的 Fe 显着提高了光吸收效率,从而导致了可见光偏移。这种转变与使用 Kabelka-Munk 函数F ( R )测量并由Urbach 能量值证实的TiO 2带隙的减小有关。此外,制备的Fe掺杂TiO 2样品含有适当比例的锐钛矿和金红石纳米颗粒的混合物,可用于太阳能电池应用。

更新日期:2021-09-07
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