Quantitative Mapping of Nanoscale Chemical Dynamics in Sub‐Sampled Operando (S)TEM Images using Spatio‐Temporal Analytics
Quantitative Mapping of Nanoscale Chemical Dynamics in Sub‐Sampled Operando (S)TEM Images using Spatio‐Temporal Analytics
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使用时空分析对子采样操作 (S)TEM 图像中的纳米级化学动力学进行定量绘图
DOI：
10.1002/cctc.201800333
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发表时间：
2018
期刊：
影响因子：
4.5
通讯作者：
L. Bramer
中科院分区：
文献类型：
--
作者：
B. Stanfill;S. Reehl;Maggie Johnson;N. Browning;B. L. Mehdi;Petruta Caragea;L. Bramer
在使用操作扫描透射电子显微镜研究动态化学过程中的主要限制之一是电子束对所观察到的反应动力学的影响。在这里，我们证明了灵活的高斯混合模型可以用于直接从子采样图像中提取定量信息，即图像中并非所有像素都被光束照射的图像。这种方法的使用被证明在水溶液中的银（Ag）纳米粒子的生长和锂电池的充电/放电循环。在这两个视频中，成像的化学反应可以精确量化，子采样水平低至1%。此外，我们的分析银成核视频揭示了新的光异质和均匀的成核动力学之间的相互作用。使用一小部分像素执行操作成像意味着观察可以显著降低光束的影响，自动提高成像速度并降低所需的总数据传输速率。这种新的软件功能提供了潜在的显着扩大应用的操作硬件方法来研究材料中的纳米级动力学。
One of the main limitations in the use of operando scanning transmission electron microscopes to study dynamic chemical processes is the effect of the electron beam on the kinetics of the reaction being observed. Here we demonstrate that a flexible Gaussian mixture model can be used to extract quantitative information directly from sub‐sampled images, that is, images in which not all the pixels in the image are illuminated with the beam. The use of this method is demonstrated on the growth of silver (Ag) nanoparticles in an aqueous solution and the charge/discharge cycle of a lithium battery. In both videos, the imaged chemical reactions can be accurately quantified for sub‐sampling levels down to 1 %. In addition, our analysis of the Ag nucleation video sheds new light on the interplay between heterogeneous and homogeneous nucleation dynamics. Performing operando imaging using a small fraction of the pixels means that the observations can significantly reduce the effect of the beam, automatically increase the imaging speed and decrease the total data transfer rate required. Such new software capabilities offer the potential to significantly widen the application of operando hardware approaches to study nanoscale dynamics in materials.
影响因子：
10.8
作者：
Woehl, Taylor J.;Park, Chiwoo;Evans, James E.;Arslan, Ilke;Ristenpart, William D.;Browning, Nigel D.
通讯作者：
Browning, Nigel D.
使用原位液体透射电子显微镜控制溶液中纳米颗粒的生长。
影响因子：
10.8
作者：
Evans JE;Jungjohann KL;Browning ND;Arslan I
通讯作者：
Arslan I
影响因子：
17.1
作者：
Woehl, Taylor J.;Evans, James E.;Arslan, Like;Ristenpart, William D.;Browning, Nigel D.
通讯作者：
Browning, Nigel D.