X-ray scintillation detectors based on metal halide perovskites have shown excellent light yield, but they mostly target applications with spatial resolution at the tens of micrometers level. Here, we use a one-step solution method to grow arrays of 15-μm-long single-crystalline CsPbBr3 nanowires (NWs) in an AAO (anodized aluminum oxide) membrane template, with nanowire diameters ranging from 30 to 360 nm. The CsPbBr3 nanowires in AAO (CsPbBr3 NW/AAO) show increasing X-ray scintillation efficiency with decreasing nanowire diameter, with a maximum photon yield of ∼5 »300 ph/MeV at 30 nm diameter. The CsPbBr3 NW/AAO composites also display high radiation resistance, with a scintillation-intensity decrease of only ∼20-30% after 24 h of X-ray exposure (integrated dose 162 Gyair) and almost no change after ambient storage for 2 months. X-ray images can distinguish line pairs with a spacing of 2 μm for all nanowire diameters, while slanted edge measurements show a spatial resolution of ∼160 lp/mm at modulation transfer function (MTF) = 0.1. The combination of high spatial resolution, radiation stability, and easy fabrication makes these CsPbBr3 NW/AAO scintillators a promising candidate for high-resolution X-ray imaging applications.
|Number of pages||9|
|Journal||ACS Applied Nano Materials|
|Early online date||2021 Dec 18|
|Publication status||Published - 2022 Jan 28|
Bibliographical noteFunding Information:
This project received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Grant agreement no. 801847). This research was also funded by the Olle Engkvist foundation, NanoLund, and Marie Sklodowska Curie Actions Cofund, Project INCA 600398. This work was partly supported by the Swedish Research Council (2020-03530) and Knut and Alice Wallenberg Foundation (2016.0059). The Research Infrastructure Fellow program from the Swedish Foundation for Strategic Research also provided support for this research.
© 2021 The Authors. Published by American Chemical Society.
Subject classification (UKÄ)
- Accelerator Physics and Instrumentation
- micrometer spatial resolution
- nanowire array
- X-ray imaging