Argonne National Laboratory

Jianguo Wen

Materials Scientist

Transmission electron microscopy for understanding the materials structure/property relationships at high spatiotemporal resolution

Biography

Jianguo (J.G.) Wen is a material scientist at the Center for Nanoscale Materials who studies materials structures at high spatiotemporal resolution for understanding structure/property relationship using advanced transmission electron microscopy. The materials he studies covers nanomaterials, batteries, catalysts, photovoltaic materials, and superconducting, ferroelectric, piezoelectric materials etc. He also actively studies phase transformation mechanism including graphite/diamond and water/ice. Recently, his research focus is on studying the correlation between atomic structures of quantum emitters and their optical performance.

Education

  • BS, Physics Department, Wuhan University
  • Ph.D., Institute of Physics, Chinese Academy of Sciences
  • Postdoctoral Fellow, Delft University of Technology, The Netherlands

Research Topics

  • Development of the Quantum Emitter Electron Nanomaterial Microscope (QuEEN-M) for studying atomic structures and optical properties of quantum emitters at high spatiotemporal resolution, by combining atomic resolution scanning/transmission electron microscopy, cathodoluminescence & photoluminescence spectroscopy, and ultrafast electron beam pulsers.
  • Development of cryogenic liquid cell in combination with the 3-low (low-dose, low-KV, low-temperature) high resolution TEM imaging to study water/ice transformation process.  
  • Development of 3D electron diffraction for revealing nanostrain and lattice displacement in battery materials, as well as studying atomic structures of novel materials.
  • In-situ study of cracking propagation behaviors in monolayer 2D materials at an atomic scale by combining a TEM picoindenter with in-situ aberration-corrected high-resolution TEM imaging.
  • Studying material structures at high spatiotemporal resolution for understanding structure/property relationship using advanced transmission electron microscopy for nanomaterials including batteries, catalysts, photovoltaic materials, and superconducting, ferroelectric, piezoelectric oxide films.

Current/previous projects

  • Center for Nanoscale Materials, Electron and X-ray Microscopy: Development and application of advanced transmission electron microscopy for studying structure/property relationships of materials at high spatiotemporal resolution.
  • QuEEN-M: Development of the Queen-M (Quantum Emitter Electron Nanomaterial Microscope) for studying the correlation between atomic structures of quantum emitters and their optical performance.
  • Transmission Electron Aberration-Corrected Microscope (TEAM): Development of in-situ TEM modulars including MEMS liquid cell, MEMS heating, and MEMS tensile stages for the TEAM project.
  • Argonne internal projects on batteries: structural studies of cathode/anode materials for lithium-ion batteries, lithium-oxygen batteries.
  • Argonne internal projects on new materials discovery: structural studies of novel materials using 3D electron diffraction and aberration-corrected scanning/transmission electron microscopy.

Publications

Awards

Research News