報告題目:STEM 技術的發展及其在功能材料中的應用
報 告 人:王毅(德國馬普固體研究所)
報告時間:2019年11月27日上午8:30-9:30
報告地點:江蘇省高效電化學儲能技術重點實驗室 8號樓 8311
主辦單位:??茀f、材料科學與技術學院
報告摘要:
The marked progress of the instrumentation hardware has made scanning transmission electron microscope (STEM) imaging and spectroscopy at atomic resolution readily possible nowadays. But still, the acquisition and interpretation of these data can be problematic due to heavy image distortion and poor signal-to-noise ratio.
In this presentation, I will present the development of STEM imaging acquisition, post-data processing, and image quantification procedures, which improve image measurement precision to picometer-scale. Shifting to analytical regime, by combining multi-frame spectrum imaging and automatic energy-offset correction, I developed a spectrum imaging technique, which suppresses image distortion and improves the signal-to-noise ratio. I will also talk about our recent work on electric field mapping by 4D-STEM using fast direct electron detector. Finally, I will show some examples on using these quantitative and analytical STEM techniques to probe the structural, chemical and electronic properties at atomic scale in the fields of functional oxides and energy-related materials.
報告人簡介:
王毅,現任德國馬普固體研究所研究員 (永久職位),電鏡中心課題組長。2006年獲湖北大學獲物理學學士、2009年獲材料學碩士學位、2012年獲法國國家科學研究中心-下諾曼底卡昂大學獲物理學博士學位。2013年開始在德國馬普固體研究所開展科研工作,研究方向為球差校正(掃描)透射電子顯微鏡、原子分辨電子能量損失譜、4D-STEM等相關技術開發,及其在功能材料中的應用。在Nature Materials、Nature Physics、Nature communications、Ultramicroscopy 、Advanced Materials 等學術期刊發表論文50余篇。