Pudza Inga, Pudzs Kaspars, Tokmakovs Andrejs, Strautnieks Normunds Ralfs, Kalinko Aleksandr, Kuzmin Alexei
Institute of Solid State Physics, University of Latvia, Kengaraga Street 8, LV-1063 Riga, Latvia.
Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, D-22607 Hamburg, Germany.
Materials (Basel). 2023 Jan 10;16(2):667. doi: 10.3390/ma16020667.
Hybrid materials combining an organic matrix and high-Z nanomaterials show potential for applications in radiation detection, allowing unprecedented device architectures and functionality. Herein, novel hybrid organic-inorganic systems were produced using a mixture of tungstate (CaWO4 or ZnWO4) nanoparticles with a P3HT:PCBM blend. The nano-tungstates with a crystallite size of 43 nm for CaWO4 and 30 nm for ZnWO4 were synthesized by the hydrothermal method. Their structure and morphology were characterized by X-ray diffraction and scanning electron microscopy. The hybrid systems were used to fabricate direct conversion X-ray detectors able to operate with zero bias voltage. The detector performance was tested in a wide energy range using monochromatic synchrotron radiation. The addition of nanoparticles with high-Z elements improved the detector response to X-ray radiation compared with that of a pure organic P3HT:PCBM bulk heterojunction cell. The high dynamic range of our detector allows for recording X-ray absorption spectra, including the fine X-ray absorption structure located beyond the absorption edge. The obtained results suggest that nanocrystalline tungstates are promising candidates for application in direct organic-inorganic X-ray detectors.
将有机基质与高Z值纳米材料相结合的混合材料在辐射探测应用中显示出潜力，可实现前所未有的器件架构和功能。在此，使用钨酸盐（CaWO4或ZnWO4）纳米颗粒与P3HT:PCBM混合物制备了新型有机-无机混合体系。通过水热法合成了微晶尺寸为43nm（CaWO4）和30nm（ZnWO4）的纳米钨酸盐。通过X射线衍射和扫描电子显微镜对其结构和形貌进行了表征。该混合体系用于制造能够在零偏压下工作的直接转换X射线探测器。使用单色同步辐射在很宽的能量范围内测试了探测器性能。与纯有机P3HT:PCBM体异质结电池相比，添加高Z值元素的纳米颗粒提高了探测器对X射线辐射的响应。我们探测器的高动态范围允许记录X射线吸收光谱，包括位于吸收边之外的精细X射线吸收结构。所得结果表明，纳米晶钨酸盐是直接有机-无机X射线探测器应用的有前途的候选材料。
