6/1 Seminar Speech

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建立於 2020-05-26, 週二 09:42

最近更新於 2020-06-01, 週一 13:20

發佈於：2020-05-26, 週二 09:44

點擊數：4349

Speaker: Professor Chien-Chun Chen

Topic: Atomic Electron Tomography

Speaker：Professor Chien-Chun Chen

Organization：Department of Engineering and System Science, National Tsing Hua University

Topic：Atomic Electron Tomography

Date：10:20 , 2020.6.1

Location：Room 203, College of Engineering

Education：

University of California, Los Angeles (U.S.A.) / Physics / PhD

National Taiwan University / Physics / MS

National Taiwan University / Physics / BS

Work Experience：

National Tsing Hua University / Department of Engineering and System Science / Assistant Professor

National Applied Research Laboratories / Instrument Technology Research Center / Assistant Research Fellow

National Synchrotron Radiation Research Center / Assistant Research Fellow

National Sun Yat-sen University / Department of Physics / Assistant Professor

Abstract：

Three-dimensional (3D) imaging and structural determination have played an extremely important role in the evolution of modern science and technology. X-ray crystallography, a 100-year-established method based on the global average of thousands to millions of identical unit cells, remains the only method to determine 3D structures at atomic resolution. However, visualizing local atomic structures within individual samples (e.g., defects and dislocations) has become much more important in modern science due to their capability of dramatically changing the properties of materials. More recently, with advancements of electron microscopy, the alternative methodology, electron tomography (ET), has appeared its great potential to visualize 3D structures of local structures at atomic resolution. By combining state-of-the-art scanning transmission electron microscope (STEM) with high-angle annual dark field (HAADF) detector and a novel tomographic reconstruction technique, known as equally sloped tomography (EST), we have achieved electron tomography at atomic resolution and identified all atoms within the nanoparticle. I will introduce the fundamentals of atomic electron tomography and current developments of this technique in Taiwan.