Atomic Spatial and Temporal Imaging of Local Structures and Light Elements inside Zeolite Frameworks.,Advanced Materials

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Atomic Spatial and Temporal Imaging of Local Structures and Light Elements inside Zeolite Frameworks.
Advanced Materials ( IF 27.4 ) Pub Date : 2019-11-29 , DOI: 10.1002/adma.201906103
Boyuan Shen ₁ , Xiao Chen ₁ , Dali Cai ₁ , Hao Xiong ₁ , Xin Liu _{2,

3} , Changgong Meng ₂ , Yu Han _{3,

4} , Fei Wei ₁

Affiliation

Identifying the atomic structures of porous materials in spatial and temporal dimensions by (scanning) transmission electron microscope ((S)TEM) is significant for their wide applications in catalysis, separation and energy storage. However, the sensitivity of materials to electron beams made it difficult to reduce the electron damage to specimens while maintaining the resolution and signal-to-noise ratio. It is therefore still challenging to capture multiple images of the same area in one crystal to image the temporal changes of lattices. Usings integrated differential phase contrast (iDPC) STEM, atomic-resolution imaging of beam-sensitive zeolite frameworks is achieved with an ultralow dose of 40 e- Å-2 , 2-3 orders of magnitude lower than that of conventional STEM. Based on the iDPC technique, not only the atomic 3D architecture of ZSM-5 crystals but also the changes of frameworks are observed during in situ experiments. Local structures and light-element aromatics in ZSM-5 crystals can also be revealed directly under iDPC-STEM. These results provided not only an efficient tool to image beam-sensitive materials with ultralow beam current but also a new strategy to observe and investigate the hydrocarbon pools in zeolite catalysts at the single-molecule scale.

中文翻译：

沸石骨架内部局部结构和轻元素的原子时空成像。

通过（扫描）透射电子显微镜（（S）TEM）识别多孔材料在空间和时间维度上的原子结构，对于其在催化，分离和能量存储中的广泛应用具有重要意义。但是，由于材料对电子束的敏感性，很难在保持分辨率和信噪比的同时减少电子对标本的损害。因此，在一个晶体中捕获相同区域的多个图像以对晶格的时间变化进行成像仍然具有挑战性。使用集成的差分相衬对比度（iDPC）STEM，可以以40e-Å-2的超低剂量实现光束敏感沸石骨架的原子分辨率成像，比传统STEM的剂量低2-3个数量级。基于iDPC技术，在现场实验中，不仅观察到ZSM-5晶体的原子3D结构，而且观察到框架的变化。也可以在iDPC-STEM下直接显示ZSM-5晶体中的局部结构和轻元素芳族化合物。这些结果不仅提供了一种以超低束电流对束流敏感材料进行成像的有效工具，而且为观察和研究单分子规模的沸石催化剂中的碳氢化合物池提供了新的策略。

更新日期：2020-01-27

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