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Anatase to rutile phase transformation of iron-doped titanium dioxide nanoparticles: The role of iron content

机译：铁掺杂二氧化钛纳米颗粒的金红石相变的锐钛矿：铁含量的作用

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摘要

Control of the conditions that affect the formation of the anatase and rutile phases of TiO2 is of considerable interest. The aim of this work was to study the effect of Fe doping on the anatase to rutile transformation for the TiO2:Fe3+ samples not undergo annealing at high temperatures. In the hope of increasing photocatalysis efficiency, the decrease of TiO2 band-gap energy caused by Fe doping was studied. The Fe3+-doped TiO2 (TiO2:Fe3+) nanoparticles with dopant contents ranging from 0 to 14.54 at% have been synthesized by hydrothermal method. Different techniques such as transmission electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, Raman scattering, diffuse reflection and photoluminescense spectroscopy were used to characterize the synthesized nanoparticles. The results showed that the increase of Fe3+ dopant content up to 9.29 at% leaded to the anatase to rutile phase transformation. The Fe-doping resulted in the shifting and broadening of the Raman modes, and the red shift of the absorption edge of the TiO2:Fe3+ nanoparticles as well. The band gap energy decreased from 3.57 to 3.06 eV for the direct and from 3.21 to 2.14 eV for indirect transitions with increasing Fe3+-doping concentration from 0 to 14.54 at%. In addition, the presence of Fe3+ dopant affected the photoluminescence spectra of the nanoparticles.
机译：控制影响TiO 2的锐钛矿和金红石阶段形成的条件具有相当大的兴趣。这项工作的目的是研究Fe掺杂对TiO2：Fe3 +样品在高温下进行退火的金红石转化的影响。在升高光催化效率的希望中，研究了由Fe掺杂引起的TiO2带间隙能量的降低。通过水热法合成了具有掺杂剂内容物的Fe3 + - 掺杂的TiO 2（TiO2：Fe3 +）纳米颗粒，其掺杂剂含量为0至14.54％。使用不同的技术，例如透射电子显微镜，能量分散X射线光谱，X射线衍射，拉曼散射，弥漫反射和光致荷敏光谱，表征合成的纳米颗粒。结果表明，将Fe3 +掺杂剂含量的增加高达9.29％以锐钛矿对金红相转化。 Fe-掺杂导致拉曼模式的移位和扩展，以及TiO 2：Fe3 +纳米颗粒的吸收边缘的红色移位。带隙能量从3.57到3.06eV为直接和3.21至2.14eV降低，用于间接转变，随着0至14.54的浓度增加，浓度增加。另外，Fe3 +掺杂剂的存在影响了纳米颗粒的光致发光光谱。

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