Highly sensitive terbium-based metal–organic framework scintillators applied in flexible X-ray imaging†

IF 6.1 1区 化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR
Peng-Kun Wang, Wen-Fei Wang, Bao-Yi Li, Rui-Xuan Qian, Zhao-Xing Gao, Shuai-Hua Wang, Fa-Kun Zheng and Guo-Cong Guo
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Abstract

Scintillators have played an indispensable role in public security and medical diagnosis fields due to their ability to convert X-ray photons into visible light. Metal–organic frameworks (MOFs) have the advantages of designable structures, easy preparation of flexible films and high stability, and hence show great potential in the field of scintillation. However, research on flexible X-ray imaging based on MOF scintillators has been rather limited. The exploration and development of MOF-based flexible scintillation screens would be very promising and exciting. Here, a novel terbium-based MOF (Tb-MOF-1) scintillator was synthesized and employed for X-ray detection and imaging. Benefiting from the sensitizing effect of the ligand, Tb-MOF-1 shows excellent photoluminescence and radioluminescence signals, and its scintillation sensitivity is much higher than that of the commercial scintillator Bi4Ge3O12 (BGO). Tb-MOF-1 shows a low X-ray detection limit of 1.71 μGy s−1, which is lower than the demand for medical diagnosis of 5.5 μGy s−1. The scintillation mechanism of Tb-MOF-1 is substantiated using spectroscopy and theoretical calculations. Furthermore, the robust structure of Tb-MOF-1 brings its strong tolerance against water and X-ray dosages, which facilitates its long-term operation. A flexible scintillation screen (Tb-MOF-screen) derived from Tb-MOF-1 was fabricated, achieving a high spatial resolution of 7.7 lp mm−1@MTF 0.2. Ultimately, flexible X-ray imaging tests were successfully carried out by tightly fitting the Tb-MOF-screen to different curvature radii wires, which firstly verifies the X-ray imaging potential of Ln-MOF-based scintillation screens for non-planar objects.

Abstract Image

Abstract Image

高灵敏度铽基金属有机骨架闪烁体在柔性x射线成像中的应用
闪烁体具有将x射线光子转化为可见光的能力,在公共安全和医疗诊断领域发挥着不可或缺的作用。金属有机骨架(MOFs)具有结构可设计、柔性薄膜制备方便、稳定性高等优点,在闪烁领域显示出巨大的潜力。然而,基于MOF闪烁体的柔性x射线成像研究却相当有限。基于mof的柔性闪烁屏的探索和开发是非常有前景的。本文合成了一种新型铽基MOF (Tb-MOF-1)闪烁体,并将其用于x射线探测和成像。得益于配体的敏化作用,Tb-MOF-1表现出优异的光致发光和放射发光信号,其闪烁灵敏度远高于商用闪烁体Bi4Ge3O12 (BGO)。Tb-MOF-1的x射线检出限较低,仅为1.71 μGy s−1,低于医学诊断所需的5.5 μGy s−1。利用光谱学和理论计算证实了Tb-MOF-1的闪烁机理。此外,Tb-MOF-1的坚固结构使其对水和x射线剂量具有较强的耐受性,从而有利于其长期运行。由Tb-MOF-1衍生而成的柔性闪烁屏(Tb-MOF-screen)的空间分辨率达到了7.7 lp mm−1@MTF 0.2。最终,通过将tb - mof闪烁屏与不同曲率半径的导线紧密贴合,成功进行了柔性x射线成像测试,首次验证了ln - mof闪烁屏对非平面物体的x射线成像潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Inorganic Chemistry Frontiers
Inorganic Chemistry Frontiers CHEMISTRY, INORGANIC & NUCLEAR-
CiteScore
10.40
自引率
7.10%
发文量
587
审稿时长
1.2 months
期刊介绍: The international, high quality journal for interdisciplinary research between inorganic chemistry and related subjects
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