Highly Sensitive Direct X‐Ray Detector Based on Copper(II) Coordination Polymer Single Crystal with Anisotropic Charge Transport

Abstract

Anisotropic charge transport plays a pivotal role in clarifying the conductivity mechanism in direct X‐ray detection to improve the detection sensitivity. However, the anisotropic photoelectric effect of semiconductive single crystal responsive to X‐ray is still lacking of theoretical and experimental proof. The semiconductive coordination polymers (CPs) with designable structures, adjustable functions, and high crystallinity provide a suitable platform for exploring the anisotropic conductive mechanism. Here,the study first reveals a 1D conductive transmission path for direct X‐ray detection from the perspective of structural chemistry. The semiconductive copper(II)‐based CP 1 single crystal detector exhibits unique anisotropic X‐ray detection performance. Along the 1D π–π stacking direction, the single crystal device (1‐SC‐a) shows a superior sensitivity of 2697.15 µCGyair−1 cm−2 and a low detection limit of 1.02 µGyair s−1 among CPs‐based X‐ray detectors. This study provides beneficial guidance and deep insight for designing high‐performance CP‐based X‐ray detectors.

Synthesis of energetic coordination compounds based on pyrazole and 4-chloropyrazole via co-melting crystallization method

“…The solvent-based approach for ECCs synthesis entails breaking the ionic bonds in inorganic salts and subsequently reassembling them with organic ligands to create coordination compounds. 18,19 While generally feasible, this process can become intricate, primarily due to solvent involvement (Scheme 1, Path 1). One prevalent issue is the potential introduction of solvent molecules that are challenging to remove into the resulting ECCs, including coordinated or crystallization water.…”

Radiochromic semiconductive MOFs with high sensitivity and fast photochromic responses for dual-mode X-ray direct detection

“…22 A polycrystalline pellet sample of this Tb( iii )–benzoquinone MOF had a thermal stability up to 200 °C and an X-ray sensitivity of 23.8 μC Gy −1 cm −2 under 80 kV p X-ray exposure, and is competitive with the commercial a-Se detector. Guo, Zheng and coworkers found that a single-crystal detector of a copper( ii ) MOF 23 displayed a superior sensitivity of 2697.15 μC Gy −1 cm −2 . In 2022, Han et al reported a viologen-templated zinc-oxalate semiconductive MOF (EV-MOF detector) with the highest X-ray sensitivity (3216 μC Gy −1 cm −2 at 1339 V cm −1 ) so far.…”