Zhang Zhaojun, Dierks Hanna, Lamers Nils, Sun Chen, Nováková Klára, Hetherington Crispin, Scheblykin Ivan G, Wallentin Jesper
Synchrotron Radiation Research and NanoLund, Department of Physics, Lund University, Box 124, Lund 22100, Sweden.
Chemical Physics and NanoLund, Department of Chemistry, Lund University, Box 124, Lund 22100, Sweden.
ACS Appl Nano Mater. 2022 Jan 28;5(1):881-889. doi: 10.1021/acsanm.1c03575. Epub 2021 Dec 18.
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 CsPbBr nanowires (NWs) in an AAO (anodized aluminum oxide) membrane template, with nanowire diameters ranging from 30 to 360 nm. The CsPbBr nanowires in AAO (CsPbBr 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 CsPbBr 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 Gy) 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 CsPbBr NW/AAO scintillators a promising candidate for high-resolution X-ray imaging applications.
基于金属卤化物钙钛矿的X射线闪烁探测器已展现出优异的光产额，但它们大多针对空间分辨率在几十微米水平的应用。在此，我们采用一步溶液法在阳极氧化铝（AAO）膜模板中生长长度为15μm的单晶CsPbBr纳米线（NWs）阵列，纳米线直径范围为30至360nm。AAO中的CsPbBr纳米线（CsPbBr NW/AAO）随着纳米线直径减小，X射线闪烁效率不断提高，在直径为30nm时最大光子产额约为5300 ph/MeV。CsPbBr NW/AAO复合材料还表现出高耐辐射性，在X射线照射24小时（累积剂量162 Gy）后闪烁强度仅下降约20 - 30%，在环境中储存2个月后几乎无变化。对于所有纳米线直径，X射线图像都能分辨间距为2μm的线对，而倾斜边缘测量显示在调制传递函数（MTF） = 0.1时空间分辨率约为160 lp/mm。高空间分辨率、辐射稳定性和易于制造的特性相结合，使得这些CsPbBr NW/AAO闪烁体成为高分辨率X射线成像应用的有前景候选者。
