Liang Chengyu, Zhang Shitong, Cheng Liwei, Xie Jian, Zhai Fuwan, He Yihui, Wang Yaxing, Chai Zhifang, Wang Shuao
State Key Laboratory of Radiation Medicine and Protection, School for Radiological and interdisciplinary Sciences (RAD-X) and Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, Soochow University, Suzhou, 215123, China.
Department of Chemistry, Northwestern University, Evanston, IL, USA.
Angew Chem Int Ed Engl. 2020 Jul 13;59(29):11856-11860. doi: 10.1002/anie.202004006. Epub 2020 May 11.
Semiconductive metal-organic frameworks (MOFs) have emerged in applications such as chemical sensors, electrocatalysts, energy storage materials, and electronic devices. However, examples of semiconductive MOFs within flexible electronics have not been reported. We present flexible X-ray detectors prepared by thermoplastic dispersal of a semiconductive MOF (SCU-13) through a commercially available polymer, poly(vinylidene fluoride). The flexible detectors exhibit efficient X-ray-to-electric current conversion with enhanced charge-carrier mobility and low trap density compared to pelleted devices. A high X-ray detection sensitivity of 65.86 μCGy cm was achieved, which outperforms other pelleted devices and commercial flexible X-ray detectors. We demonstrate that the MOF-based flexible detectors can be operated at multiple bending angles without a deterioration in detection performance. As a proof-of-concept, an X-ray phase contrast under bending conditions was constructed using a 5×5 pixelated MOF-based imager.
半导体金属有机框架材料（MOFs）已在化学传感器、电催化剂、储能材料和电子器件等应用中崭露头角。然而，尚未有关于柔性电子器件中半导体MOFs的实例报道。我们展示了通过热塑性分散一种半导体MOF（SCU-13）于市售聚合物聚偏二氟乙烯中制备的柔性X射线探测器。与颗粒状器件相比，该柔性探测器展现出高效的X射线到电流的转换，具有增强的电荷载流子迁移率和低陷阱密度。实现了65.86 μCGy⁻¹ cm⁻²的高X射线探测灵敏度，优于其他颗粒状器件和商用柔性X射线探测器。我们证明基于MOF的柔性探测器可在多个弯曲角度下操作而检测性能不会恶化。作为概念验证，使用基于5×5像素化MOF的成像器构建了弯曲条件下的X射线相衬成像。
