Copper(I) Iodide–Hexamethylenetetramine Complex as Stable Scintillator for Free-Standing Flexible and High-Resolution X-ray Imaging Screens

IF 8.7 1区化学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

ACS Materials Letters Pub Date : 2025-05-23 DOI:10.1021/acsmaterialslett.5c00649

Sergey A. Fateev, Anna D. Riabova, Daria E. Belikova, Anastasia V. Orlova, Eugene A. Goodilin and Alexey B. Tarasov*,

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Abstract

The organo–inorganic coordination polymer Cu₆I₆(HMTA)₂ (HMTA – hexamethylenetetramine) has been explored as a scintillator for X-ray imaging applications. This material, synthesized from readily available precursors via a scalable solution-based method, exhibits high photoluminescence quantum yield (>95%) and exceptional thermal and radiation stability. Composite scintillation screens (CSS) were fabricated by embedding Cu₆I₆(HMTA)₂ nanoparticles into an ethylene-vinyl acetate (EVA) matrix, achieving high phosphor loading (up to 75 wt %) while maintaining mechanical flexibility. These CSS exhibited a maximum light yield of 63,500 photons/MeV and spatial resolution up to 18 lp/mm (line pairs/mm). Thin-film scintillators, produced by depositing Cu₆I₆(HMTA)₂ on porous membranes, achieved an even higher spatial resolution of 24.5 lp/mm but showed reduced mechanical robustness. Remarkably, Cu₆I₆(HMTA)₂-based screens demonstrated superior radiation stability, retaining 95% of their initial radioluminescence intensity after exposure to high X-ray doses (∼100 Gy). These results highlight the potential of Cu₆I₆(HMTA)₂ as a high-performance scintillator for X-ray imaging applications.

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碘化铜-六亚甲基四胺配合物作为独立柔性高分辨率x射线成像屏的稳定闪烁体

有机-无机配位聚合物Cu6I6(HMTA)2 （HMTA -六亚甲基四胺）已被探索作为x射线成像应用的闪烁体。这种材料是通过可扩展的基于溶液的方法从现成的前体合成的，具有高光致发光量子产率（>95%）和优异的热稳定性和辐射稳定性。通过将Cu6I6(HMTA)2纳米颗粒嵌入乙烯-醋酸乙烯（EVA）基质中，制备了复合闪烁屏（CSS），在保持机械柔韧性的同时实现了高荧光粉负载（高达75% wt %）。这些CSS的最大产光量为63,500光子/MeV，空间分辨率高达18 lp/mm（线对/mm）。通过在多孔膜上沉积Cu6I6(HMTA)2制成的薄膜闪烁体达到了24.5 lp/mm的更高空间分辨率，但机械稳健性降低。值得注意的是，基于Cu6I6(HMTA)2的屏幕显示出优越的辐射稳定性，在暴露于高x射线剂量（~ 100 Gy）后保持95%的初始放射发光强度。这些结果突出了Cu6I6(HMTA)2作为x射线成像应用的高性能闪烁体的潜力。

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来源期刊

ACS Materials Letters MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

14.60

自引率

3.50%

发文量

261

期刊介绍： ACS Materials Letters is a journal that publishes high-quality and urgent papers at the forefront of fundamental and applied research in the field of materials science. It aims to bridge the gap between materials and other disciplines such as chemistry, engineering, and biology. The journal encourages multidisciplinary and innovative research that addresses global challenges. Papers submitted to ACS Materials Letters should clearly demonstrate the need for rapid disclosure of key results. The journal is interested in various areas including the design, synthesis, characterization, and evaluation of emerging materials, understanding the relationships between structure, property, and performance, as well as developing materials for applications in energy, environment, biomedical, electronics, and catalysis. The journal has a 2-year impact factor of 11.4 and is dedicated to publishing transformative materials research with fast processing times. The editors and staff of ACS Materials Letters actively participate in major scientific conferences and engage closely with readers and authors. The journal also maintains an active presence on social media to provide authors with greater visibility.