主讲人：姚立德 博士 芬兰阿尔托大学
时间：2017年7月17日 （星期二） 下午15:00
One of most exciting developments in nanomaterials characterization is the commercial-ization of aberration corrected TEMs and STEMs[1,2]. By correcting for spherical aber-rations, these techniques allow for the imaging of atomic positions with a precision of a few picometers. Together with the integration of energy dispersive X-ray spectroscopy (EDS) and electron energy loss spectroscopy (EELS), the structural and elemental com-position of nanomaterials can be determined at the atomic level. Recently, another excit-ing development in TEM has emerged, namely the use of special specimen holders for in-situ TEM measurements under various heating, cooling, and electrical bias conditions . The combination of in-situ TEM/STEM imaging and EDS/EELS analysis is ex-tremely powerful as it allows for real-time studies on nanoscale dynamical processes and their direct impact on macroscopic material properties. In the Nanomicroscopy Center at Aalto University, we have established a new platform for in-situ TEM characterization. In this talk, I will present some recent experimental results, including (1) the observation of electron beam-induced structural phase transitions in epitaxial manganite films , (2) in-situ spectroscopy of electric-field controlled oxygen ion migration in metal/oxide heterostructures , and (3) simultaneous real-time analysis of resistive and structural phase transitions in complex oxide nanostructures . Additionally, I would present an outlook on the development of a combined optical/electrical probing holder for in-situ TEM measurements on perovskite solar cells.
Dr. Lide Yao， Aalto University, Finland
Dr. Lide Yao is currently an Academy Research Fellow at the Aalto University, Finland. In November 2007, he received a PhD in condensed matter physics under the supervision of Prof. Richeng Yu from the Institute of Physics, Chinese Academy of Sciences in China. After that, he joined the Laboratory of Electron Microscopy at the University of Karlsruhe (current Karlsruhe Institute of Technology) and the Fritz-Haber Institute of the Max-Planck Society in Germany for postdoc research. Since November 2010, he moved to the Department of Applied Physics of the Aalto University in Finland. Currently, he is leading an Academy Research Fellow project (ITEMsDo, 2015 – 2020) and a Key Project (2016-2018) granted by the Academy of Finland. His research interest is mainly focusing on developing and utilizing the in-situ TEM for innovative studies on electrically, thermally, and optically driven nanoscale functional materials. As yet, Dr. Yao has authored/co-authored more than 50 peer-reviewed research articles, including Nature Mater.，Nature Commun., Phy. Rev. Lett.，Adv. Mater.，Nano Lett., Adv. Funct. Mater., PRB, APL, etc.