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Kai He

Postdoctoral Research Associate | Electron Microscopy


  • Transmission Electron Microscopy
  • Electron Holography
  • Lorentz Microscopy
  • In-Situ TEM Application
  • Electron Beam Lithography

CFN Research Activities

Kai He joined the Electron Microscopy Group in the Center for Functional Nanomaterials at Brookhaven National Laboratory in July 2013. His research interests include transmission electron microscopy, eletron holography and in-situ applications of nanostructured magnetic, electronic, and energy materials. At CFN, he will be focusing on the application of scanning transmission electron microscopy and in-situ TEM on multiferroics and energy storage materials.


  • B.S./M.S.: Harbin Institute of Technology
  • Ph.D.: Arizona State University
    • Materials Science and Engineering

Professional Appointments

  • Ellen Williams Postdoc Fellow/Assistant Research Scientist: University of Maryland
    • Materials Science and Engineering

Selected Publications & Research Highlights

* corresponding author,  (1) co-first author.

K. He, Y. Zhou, P. Gao, L. Wang, N. Pereira, G.G.Amatucci, W. K. Nam, X. Q. Yang, Y. Zhu, F. Wang, D. Su, Sodiation via Heterogeneous Disproportionation in FeF2 Electrodes for Sodium-Ion Batteries, ACS Nano, 8, 7251 (2014).

Y. Wen(1), K. He (1), Y. Zhu(1), F. Han, Y. Xu, I. Matsuda, Y. Ishii, J. Cumings, C. Wang, Expanded Graphite as Superior Anode for Sodium-Ion Batteries, Nature Communications, 5,. 4033 (2014).

K. He, J. Cumings, Diagnosing nanoelectronic components using coherent electrons, Nano Letters, 13, 4815 (2013).

K. He*, D. J. Smith, M. R. McCartney, Direct visualization of three-step magnetization reversal of nanopatterned spin-valve elements using off-axis electron holography, Applied Physics Letters, 94, 172503 (2009). (Front Cover Article)

K. He*, D. J. Smith, M. R. McCartney, Effects of vortex chirality and shape anisotropy on magnetization reversal of Co nanorings, Journal of Applied Physics, 107, 09D307 (2010). (Invited)

K. He*, D.J. Smith, M.R. McCartney, Observation of asymmetrical pinning of domain walls in notched Permalloy nanowires using electron holography, Applied Physics Letters, 95, 182507, (2009).

K. He, J. H. Cho, Y. Jung, S. T. Picraux, J. Cumings, “Silicon Nanowires: Electron holography studies of doped p-n junctions and biased Schottky barriers”, Nanotechnology, 24, 115703 (2013).

K. He, C. Y. Xu, L. Zhen, W. Z. Shao, “Hydrothermal Synthesis and Characterization of Single-Crystalline Fe3O4 Nanowires with High Aspect Ratio and Uniformity”, Materials Letters, 61, 3159 (2007).