Halogen-bonded charge-transfer co-crystal scintillators for high-resolution X-ray imaging

Chen, Yu-Hua; Zhang, Guo-Zhen; Chen, Fu-Hai; Zhang, Shu-Quan; Fang, Xin; Chen, Hong-Ming; Lin, Mei-Jin

doi:10.1039/d4sc00735b

Chem. Sci.

2024

DOI: 10.1039/d4sc00735b

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Halogen-bonded charge-transfer co-crystal scintillators for high-resolution X-ray imaging

Yu-Hua Chen,

Guo-Zhen Zhang,

Fu-Hai Chen

et al.

Abstract: The development of high-quality organic scintillators encounters challenges primarily associated with the weak X-ray absorption ability resulting from the presence of low atomic number elements. An effective strategy involves the...

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Multiple Electron Transfer in Semiconductive Ternary D‐D'‐A Metal‐Organic Framework for Enhanced X‐Ray Detection and Imaging

Wei,

Liu,

et al. 2024

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Semiconductive metal–organic frameworks (MOFs) with donor–acceptor (D–A) characteristics have garnered attractive attention due to their capacity for separating and transferring photogenerated charges, making them promising candidates for high‐performance X‐ray detectors. However, the low charge transfer efficiency between the metal nodes and organic ligands limits the X‐ray‐to‐electricity conversion efficiency of these materials. Herein, an additional photoactive donor (D’) is introduced by incorporating a heavy atom‐containing polyoxometalate (POM) [α‐SiW12O40]4− into a binary {[Ni·bcbp·(H2O)2]·(H2O)4·Cl}n (Ni‐bcbp, bcbp: H2bcbp·2Cl = 1,1′‐bis(4‐carboxyphenyl)(4,4′‐bipyridinium) dichloride) MOF, resulting in a semiconductive ternary D‐D'‐A framework {[Ni2(bcbp)2·(H2O)4·(DMA)]·(SiW12O40)}n (SiW@Ni‐bcbp, DMA: dimethylacetamide). The obtained material features an unprecedented porous 8‐connected bcu‐net structure that accommodates nanoscale [α‐SiW12O40]4− counterions, displaying uncommon optoelectronic responses. In contrast to binary Ni‐bcbp, the SiW@Ni‐bcbp framework exhibits distinctive photochromism and robust X‐ray responsiveness, which can be attributed to the synergistic effects of the electron reservoir and multiple photoinduced electron transfer originating from the POMs. As a result, the X‐ray detector based on SiW@Ni‐bcbp demonstrates a sensitivity of 5741.6 µC Gyair−1 cm−2 with a low detection limit of 0.49 µGyair s−1. Moreover, the devices demonstrated the capability of producing clearness X‐ray images, providing a feasible and stable solution for constructing high‐performance direct X‐ray detectors.

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Multiple Electron Transfer in Semiconductive Ternary D‐D'‐A Metal‐Organic Framework for Enhanced X‐Ray Detection and Imaging

Wei,

Liu,

et al. 2024

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Halogen-bonded charge-transfer co-crystal scintillators for high-resolution X-ray imaging

Abstract: The development of high-quality organic scintillators encounters challenges primarily associated with the weak X-ray absorption ability resulting from the presence of low atomic number elements. An effective strategy involves the...

Cited by 1 publication

References 44 publications

Multiple Electron Transfer in Semiconductive Ternary D‐D'‐A Metal‐Organic Framework for Enhanced X‐Ray Detection and Imaging

Multiple Electron Transfer in Semiconductive Ternary D‐D'‐A Metal‐Organic Framework for Enhanced X‐Ray Detection and Imaging

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