A stable radiochromic semiconductive viologen-based metal-organic framework for dual-mode direct X-ray detection  

作　　者：Xuying Yu Jiarong Mi Yulan Han Cai Sun Mingsheng Wang Guocong Guo 

机构地区：[1]State Key Laboratory of Structural Chemistry,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou 350608,China [2]College of Chemistry,Fuzhou University,Fuzhou 350108,China [3]University of Chinese Academy of Sciences,Beijing 100049,China [4]School of Chemistry and Chemical Engineering,Queen’s University Belfast,Belfast BT95AG,United Kingdom

出　　处：《Chinese Chemical Letters》2024年第9期437-441,共5页中国化学快报（英文版）

基　　金：financial support by the National Key Research and Development Program of Ministry of Science and Technology(No.2021YFB3801604);the National Natural Science Foundation(Nos.22073102,21827813,21921001)of China。

摘　　要：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 commercialα-Se detector is still largely limited by high production costs,large leakage current and low stability.This article reports an easily prepared,stable radiochromic semiconductive metal–organic framework(MOF),(MV)[Cd_(3)(tdc)_(4)]·2H_(2)O(RCS-1,H_(2)tdc=2,5-thiophenedicarboxylic acid;MV^(2+)=methyl viologen cation)with direct X-ray detecting ability.With a large bulk resistivity of 8.40×10^(9)Ωcm,this material ensures minimal dark current and low noise for X-ray detection.Additionally,it exhibits higher sensitivity to W KαX-rays(98.58μC Gy^(-1)cm^(-2))thanα-Se(~20μC Gy^(-1)cm^(-2)).Meanwhile,unlike most reported direct X-ray detecting 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.

关 键 词：Metal-organic framework VIOLOGEN PHOTOCHROMISM CONDUCTANCE X-ray detection 

分 类 号：TN304[电子电信—物理电子学] O641.4[理学—物理化学]