Abstract Fe and Mo co-doped TiO2 pigments were prepared via solid-phase synthesis, and the samples were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS), and ultraviolet–visible–near infrared (UV-VIS-NIR) spectrophotometer. The effects of coloring impurity Fe3+ and compensating impurity Mo6+ on the phase, morphology, chemical structure, and optical properties of TiO2 pigments were systematically studied—especially the mechanism of synergistic effects of visible light color and near-infrared reflectance of TiO2 pigments. The results showed that single doping of Fe3+ or Mo6+ could accelerate the transition of TiO2 pigment from anatase phase to rutile phase. In the (Fe, Mo) co-doped sample, the Mo impurity helped accelerate the A→R crystal phase transition of TiO2, but an excessive amount of Fe impurity could inhibit the phase transition process. The morphology and particle size of the samples were also affected by the type of impurity and the doping concentration. In addition, the doped impurities could form a strong characteristic absorption peak in the visible light spectrum to enhance the absorption of visible light. The sample then gradually changed from white to pink, white gray to orange, etc. In the near-infrared region, the impurity compensation effect between Mo6+ and Fe3+ could be utilized to reduce the free carrier concentration of the TiO2 pigment and weaken its near infrared absorption. By reasonably adjusting the relative contents of Fe and Mo impurities, the developed Ti0.98875Fe0.0075Mo0.00375O2 yellow pigment could finally yield a NIR reflectance of 96%.This is expected to meet the application requirements of colored energy-saving pigments.

中文翻译：

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(Fe, Mo) 共掺杂 TiO2 用于有色冷色颜料的结构和可见-近红外光学特性

摘要 采用固相合成法制备了 Fe 和 Mo 共掺杂的 TiO2 颜料，并通过 X 射线衍射 (XRD)、场发射扫描电子显微镜 (FESEM)、X 射线光电子能谱 (XPS)、和紫外-可见-近红外（UV-VIS-NIR）分光光度计。系统研究了着色杂质Fe3+和补偿杂质Mo6+对TiO2颜料的物相、形貌、化学结构和光学性能的影响——尤其是TiO2颜料的可见光色和近红外反射率协同效应的机理。结果表明，Fe3+或Mo6+的单一掺杂可以加速TiO2颜料从锐钛矿相向金红石相的转变。在 (Fe, Mo) 共掺杂样品中，Mo 杂质有助于加速 TiO2 的 A→R 晶相转变，但过量的 Fe 杂质会抑制相变过程。样品的形态和粒径也受杂质类型和掺杂浓度的影响。此外，掺杂的杂质可以在可见光光谱中形成强烈的特征吸收峰，从而增强对可见光的吸收。然后样品逐渐由白色变为粉红色，由白灰色变为橙色等。在近红外区域，可以利用Mo6+和Fe3+之间的杂质补偿作用降低TiO2色素的自由载流子浓度，减弱其近红外吸收。通过合理调整Fe和Mo杂质的相对含量，研制的Ti0.98875Fe0.0075Mo0.00375O2黄色颜料最终可以达到96%的近红外反射率。