Abstract
Direct X-ray detectors,which directly convert X-rays into electrical signals through semiconductors,have higher space solution than scintillator-mediated indirect X-ray ones and are high desirable for early cancer detection and other applications,but the mainstream commercial α-Se detector is still largely limited by high production costs,large leakage current and low stability.This article reports an eas-ily prepared,stable radiochromic semiconductive metal-organic framework(MOF),(MV)[Cd3(tdc)4]-2H2O(RCS-1,H2tdc=2,5-thiophenedicarboxylic acid;MV2+=methyl viologen cation)with direct X-ray de-tecting ability.With a large bulk resistivity of 8.40 × 109 Ω cm,this material ensures minimal dark current and low noise for X-ray detection.Additionally,it exhibits higher sensitivity to W Kα X-rays(98.58 μC Gy-1 cm-2)than α-Se(～20 μC Gy-1 cm-2).Meanwhile,unlike most reported direct X-ray de-tecting semiconductors,compound RCS-1 shows remarkable color change upon X-ray irradiation owing to the presence of photochromism-active viologen cations.This feature offers an appealing visual detecting ability to direct X-ray detectors that provide only the electrical signals.
维普
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