학술논문
Nanocrystalline CaWO 4 and ZnWO 4 Tungstates for Hybrid Organic-Inorganic X-ray Detectors.
Document Type
Academic Journal
Author
Pudza I; Institute of Solid State Physics, University of Latvia, Kengaraga Street 8, LV-1063 Riga, Latvia.; Pudzs K; Institute of Solid State Physics, University of Latvia, Kengaraga Street 8, LV-1063 Riga, Latvia.; Tokmakovs A; Institute of Solid State Physics, University of Latvia, Kengaraga Street 8, LV-1063 Riga, Latvia.; Strautnieks NR; Institute of Solid State Physics, University of Latvia, Kengaraga Street 8, LV-1063 Riga, Latvia.; Kalinko A; 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.; Kuzmin A; Institute of Solid State Physics, University of Latvia, Kengaraga Street 8, LV-1063 Riga, Latvia.
Source
Publisher: MDPI Country of Publication: Switzerland NLM ID: 101555929 Publication Model: Electronic Cited Medium: Print ISSN: 1996-1944 (Print) Linking ISSN: 19961944 NLM ISO Abbreviation: Materials (Basel) Subsets: PubMed not MEDLINE
Subject
Language
English
ISSN
1996-1944
Abstract
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.