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通过调控铕激活剂提高FeO@YO:Eu纳米复合材料的磁饱和度

Improvement of Magnetic Saturation in FeO@YO:Eu Nanocomposites Through the Manipulation of Eu Activators.

作者信息

Rivera-Enríquez C E, Ojeda-Martínez M, Cano M E, Ojeda-Martínez M L, Barrera-Rodríguez A, Quintana-Ruiz M, Velásquez-Ordóñez C

机构信息

Centro Universitario de los Valles, Universidad de Guadalajara, Jalisco, 46600, México.

Centro Universitario de la Ciénega, Universidad de Guadalajara, Jalisco, 47820, México.

出版信息

J Fluoresc. 2025 Jan;35(1):111-120. doi: 10.1007/s10895-023-03504-9. Epub 2023 Nov 21.

DOI:10.1007/s10895-023-03504-9
PMID:37987984
Abstract

FeO@YO:Eu nanocomposites and YO:Eu nanophosphors were synthesized using the hydrothermal method. Nanocomposites were analyzed using X-ray diffraction (XRD), Rietveld refinements, Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, photoluminescence (PL), vibrating sample magnetometer (VSM), and high-resolution transmission electron microscopy (HRTEM). Nanocomposites exhibit superparamagnetic behavior that improves with Eu3+, resulting in increased magnetic saturation. In contrast to Y2O3:Eu3+ nanophosphors, the Fe3O4@Y2O3:Eu3+ nanocomposites display a distinctive characteristic whereby the photoluminescence intensity increases with a reduced concentration of Eu3+. The requirement of increasing the thickness of the Y2O3:Eu3+ outer layer to achieve improved light emission can be circumvented by solely manipulating the concentration of activators, without compromising the magnetic saturation of the nanocomposites. The luminescent and magnetic characteristics of Fe3O4@Y2O3:Eu3+ nanocomposites can be readily optimized using straightforward synthesis parameters, making them promising candidates for potential applications in theranostic medicine.

摘要

采用水热法合成了FeO@YO:Eu纳米复合材料和YO:Eu纳米磷光体。使用X射线衍射（XRD）、Rietveld精修、傅里叶变换红外光谱（FTIR）、拉曼光谱、光致发光（PL）、振动样品磁强计（VSM）和高分辨率透射电子显微镜（HRTEM）对纳米复合材料进行了分析。纳米复合材料表现出超顺磁性行为，这种行为随着Eu3+的加入而改善，导致磁饱和度增加。与Y2O3:Eu3+纳米磷光体相比，Fe3O4@Y2O3:Eu3+纳米复合材料表现出一种独特的特性，即光致发光强度随着Eu3+浓度的降低而增加。通过仅控制激活剂的浓度，就可以避免增加Y2O3:Eu3+外层厚度以实现改善发光的要求，同时又不影响纳米复合材料的磁饱和度。利用简单的合成参数可以很容易地优化Fe3O4@Y2O3:Eu3+纳米复合材料的发光和磁性特性，使其成为治疗诊断医学潜在应用的有前景的候选材料。

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本文引用的文献

1
Preparation of biocompatible magnetite-carboxymethyl cellulose nanocomposite: characterization of nanocomposite by FTIR, XRD, FESEM and TEM.生物相容性磁铁矿-羧甲基纤维素纳米复合材料的制备：通过傅里叶变换红外光谱、X射线衍射、场发射扫描电子显微镜和透射电子显微镜对纳米复合材料进行表征。
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