当前位置: X-MOL 学术Microscopy › 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.)
High spatiotemporal-resolution imaging in the scanning transmission electron microscope
Microscopy ( IF 1.8 ) Pub Date : 2020-04-03 , DOI: 10.1093/jmicro/dfaa017
Ryo Ishikawa 1, 2 , Yu Jimbo 3 , Mitsuhisa Terao 3 , Masashi Nishikawa 3 , Yujiro Ueno 1 , Shigeyuki Morishita 3 , Masaki Mukai 3 , Naoya Shibata 1, 4 , Yuichi Ikuhara 1, 4
Affiliation  

The temporal resolution in scanning transmission electron microscopy (STEM) is limited by scanning system of an electron probe, leading to only a few frames per second (fps) at most in the current microscopes. This situation enforces us to stay atomic-resolution STEM imaging and spectroscopy in the state of static observations. To push the boundary of atomic-resolution STEM imaging into dynamic observations, an unprecedentedly faster scanning system combined with fast electron detection systems should be prerequisite. Here we develop a new scanning probe system with the acquisition time of 83 nanoseconds per pixel and the fly-back time of 35 microseconds, leading to 25 fps STEM imaging with the image size of 512 × 512 pixels that is faster than a human perception speed. Using such high-speed probe scanning system, we have demonstrated the observations of shape-transformation of Pt nanoparticle and Pt single atomic motions on TiO2 (110) surface at atomic-resolution with the temporal resolution of 40 milliseconds. The present probe scanning system opens the door to use atomic-resolution STEM imaging for in-situ observation of materials dynamics under the temperatures of cooling or heating, the atmosphere of liquid or gas, electric-basing or mechanical test.

中文翻译:

扫描透射电子显微镜中的高时空分辨率成像

扫描透射电子显微镜(STEM)的时间分辨率受到电子探针扫描系统的限制,导致目前显微镜最多只有每秒几帧(fps)。这种情况迫使我们将原子分辨率 STEM 成像和光谱学保持在静态观察状态。为了将原子分辨率 STEM 成像的边界推向动态观察,一个前所未有的更快的扫描系统与快速电子检测系统相结合应该是先决条件。在这里,我们开发了一个新的扫描探针系统,每个像素的采集时间为 83 纳秒,回扫时间为 35 微秒,从而实现 25 fps STEM 成像,图像尺寸为 512 × 512 像素,比人类感知速度更快. 使用这种高速探针扫描系统,我们已经以原子分辨率和 40 毫秒的时间分辨率证明了对 Pt 纳米颗粒的形状变换和 Pt 单原子运动在 TiO2 (110) 表面上的观察。本探针扫描系统为使用原子分辨率 STEM 成像在冷却或加热温度、液体或气体气氛、电基或机械测试下原位观察材料动力学打开了大门。
更新日期:2020-04-03
down
wechat
bug