Single-Crystalline Perovskite Nanowire Arrays for Stable X-ray Scintillators with Micrometer Spatial Resolution.
Zhaojun ZhangHanna DierksNils LamersChen SunKlára NovákováCrispin John Dakin HetheringtonIvan G ScheblykinJesper WallentinPublished in: ACS applied nano materials (2021)
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 3 nanowires (NWs) in an AAO (anodized aluminum oxide) membrane template, with nanowire diameters ranging from 30 to 360 nm. The CsPbBr 3 nanowires in AAO (CsPbBr 3 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 3 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 air ) 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 3 NW/AAO scintillators a promising candidate for high-resolution X-ray imaging applications.
Keyphrases
- high resolution
- room temperature
- dual energy
- mass spectrometry
- single molecule
- ionic liquid
- reduced graphene oxide
- magnetic resonance imaging
- computed tomography
- high speed
- magnetic resonance
- optical coherence tomography
- living cells
- tandem mass spectrometry
- optic nerve
- radiation induced
- convolutional neural network
- molecularly imprinted
- contrast enhanced