Metal Halide Nanocrystals@Silica Aerogel Composite with Enhanced Dispersion Stability and Light Output for Efficient X-Ray Imaging in Harsh Environment.
Metal Halide Nanocrystals@Silica Aerogel Composite with Enhanced Dispersion Stability and Light Output for Efficient X-Ray Imaging in Harsh Environment.
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DOI：
10.1002/smll.202307758
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发表时间：
2023-12
期刊：
影响因子：
13.3
通讯作者：
Lili Han;Jihao Zhao;Lijuan Wang;Guoqiang Peng;Youkui Xu;Minglang Yuan;Yifan Miao;Zhipeng Ci-Zhipe
中科院分区：
文献类型：
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作者：
Lili Han;Jihao Zhao;Lijuan Wang;Guoqiang Peng;Youkui Xu;Minglang Yuan;Yifan Miao;Zhipeng Ci-Zhipe
金属卤化物纳米晶(MHNC)镶嵌在聚合物基质中作为柔性X射线探测器屏是一种有效的策略，具有成本低、制备简单、大面积柔性等优点。然而，MHNC在制备、复合过程中，在机械力、储存或较高的工作温度下容易聚集。同时，它表现出与聚合物不匹配的折射率，导致光产额低。该设备的相关稳定性和性能仍然是一个巨大的未披露的挑战。在本论文中，我们成功地将MHNC(以CS2、ZnBr4：Mn2+为例)集成到二氧化硅气凝胶(AG)中，并嵌入到聚苯乙烯(PS)中，成功地研制出了CZBM@AG-PS复合屏幕。进一步的表征表明，高孔率的AG模板可以有效地改善MHNC在聚合物检测器屏幕中的分散，本质上减少了在恶劣环境中聚集引起的非辐射跃迁、瑞利散射和性能老化。此外，基于MHNCs/AG和AG/PS接口的新型光传输路径也实现了更高的光输出和更低的光串扰。最后，优化后的CZBM@AG-PS屏显示出更高的光产额、空间分辨率和温度稳定性。值得注意的是，通过对其他MHNC嵌入复合膜的性能测试，证明该策略是通用的，以实现超稳定和高效的X射线成像。
Metal halide nanocrystals (MHNCs) embedded in a polymer matrix as flexible X-ray detector screens is an effective strategy with the advantages of low cost, facile preparation, and large area flexibility. However, MHNCs easily aggregate during preparation, recombination, under mechanical force, storage, or high operating temperature. Meanwhile, it shows an unmatched refractive index with polymer, resulting in low light yield. The related stability and properties of the device remain a huge unrevealed challenge. Herein, a composite screen (CZBM@AG-PS) by integrating MHNCs (Cs2 ZnBr4 : Mn2+ as an example) into silica aerogel (AG) and embedded in polystyrene (PS) is successfully developed. Further characterization points to the high porosity AG template that can effectively improve the dispersion of MHNCs in polymer detector screens, essentially decreasing nonradiative transition, Rayleigh scattering, and performance aging induced by aggregation in harsh environments. Furthermore, the higher light output and lower optical crosstalk are also achieved by a novel light propagation path based on the MHNCs/AG and AG/PS interfaces. Finally, the optimized CZBM@AG-PS screen shows much enhanced light yield, spatial resolution, and temperature stability. Significantly, the strategy is proven universal by the performance tests of other MHNCs embedded composite films for ultra-stable and efficient X-ray imaging.