Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.062
Publication date: 18th December 2023
Metal halide perovskites (MHPs) have shown excellent results as X-ray scintillation detectors. X-ray tomography requires many projections and therefore scintillators with excellent stability, which is challenging for MHPs that often suffer from fast degradation under X-ray irradiation and ambient conditions. MHP nanowires could offer improved sensitivity and resolution by exploiting nanophotonic light guiding, and the stability could be improved by growing physically protected nanowires directly in anodized aluminum oxide (AAO) nanopore templates.
We have developed a one-step solution method to grow arrays of up to 30 μm long single-crystalline CsPbBr3 nanowires in an AAO template, with controlled diameters ranging from 30 to 360 nm [1,2]. 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. 2D X-ray images can distinguish line pairs with a spacing of 2 μm and slanted edge measurements show a spatial resolution of ∼160 lp/mm at modulation transfer function (MTF) = 0.1 [1]. The stability was tested over 2 weeks of X-ray exposure [3]. The X-ray scintillation unexpectedly correlated positively with room humidity, but showed no systematic degradation. The resolution was stable at (180 ± 20) , i.e., about 2.8 micron.
For 3D microscopy, a tomogram with 600 projections was taken with a Cu X-ray source over 41 h. The scintillation variations remained below 5% during the acquisition, which allowed a successful 3D reconstruction with high spatial resolution [3]. 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.
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