二维钙钛矿中有机和无机位点的协同作用用于快中子和 X 射线成像,Advanced Functional Materials

当前位置： X-MOL 学术 › Adv. Funct. Mater. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

二维钙钛矿中有机和无机位点的协同作用用于快中子和 X 射线成像
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2023-06-06 , DOI: 10.1002/adfm.202301767
Wenyi Shao _{1,

2} , Qiang Li _{3,

4} , Tengyue He ₂ , Yue Zhang _{3,

4} , Mengchen Niu ₁ , Hongyun Wang ₁ , Zhenzhong Zhang ₁ , Yang Zhou ₂ , Jian‐Xin Wang ₂ , Ruirui Fan _{3,

4} , Xiaochuan Xia ₁ , Osman M. Bakr ₅ , Omar F. Mohammed _{2,

5} , Hongwei Liang ₁

Affiliation

快速中子和 X 射线成像被认为是互补的无损检测技术。然而，由于它们的横截面相反，在单一材料框架内开发对快中子和 X 射线敏感的闪烁体仍然具有挑战性。本文中，有机-无机杂化钙钛矿(C ₄ H ₉ NH ₃ ) ₂ PbBr ₄(BPB) 被证明是一种完全满足快中子和 X 射线探测要求的闪烁体。富含氢的有机成分充当快速中子转换器并产生可检测的反冲质子。富含重原子的无机部分有效沉积带电反冲质子的能量，并直接提供大的X射线截面。由于这些有机和无机成分的协同作用，BPB 闪烁体表现出高光产额（对于快中子，其亮度是商用 ZnS (Ag)/ 6 LiF 闪烁体的 86%；对于 X 射线，每 MeV 22 000 个光子^）快速响应时间 ( τ _deca_y= 10.3 纳秒）。更重要的是，还展示了能量选择性快中子和X射线成像，快中子分辨率为约1 lp mm ^-1 ， X射线分辨率为17.3 lp mm ^{-1 ；}这些是二维钙钛矿闪烁体的最高分辨率水平之一。这项研究强调了二维钙钛矿材料在快中子和 X 射线成像组合应用中的潜力。

"点击查看英文标题和摘要"

Synergy of Organic and Inorganic Sites in 2D Perovskite for Fast Neutron and X-Ray Imaging

Fast neutron and X-ray imaging are considered complementary nondestructive detection technologies. However, due to their opposite cross-sections, development of a scintillator that is sensitive to both fast neutrons and X-rays within a single-material framework remains challenging. Herein, an organic–inorganic hybrid perovskite (C₄H₉NH₃)₂PbBr₄ (BPB) is demonstrated as a scintillator that fully meets the requirements for both fast neutron and X-ray detection. The hydrogen-rich organic component acts as a fast neutron converter and produces detectable recoil protons. The heavy atom-rich inorganic fraction efficiently deposits the energy of charged recoil protons and directly provides a large X-ray cross-section. Due to the synergy of these organic and inorganic components, the BPB scintillator exhibits high light yields (86% of the brightness of a commercial ZnS (Ag)/⁶LiF scintillator for fast neutrons; 22 000 photons per MeV for X-rays) and fast response times (τ_deca_y = 10.3 ns). More importantly, energy-selective fast neutron and X-ray imaging are also demonstrated, with high resolutions of ≈1 lp mm⁻¹ for fast neutrons and 17.3 lp mm⁻¹ for X-rays; these are among the highest resolution levels for 2D perovskite scintillators. This study highlights the potential of 2D perovskite materials for use in combined fast neutron and X-ray imaging applications.

更新日期：2023-06-06

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南