CV

Curriculum vitae.

Contact Information

Name Jinseok Ryu, PhD
Professional Title Research Associate Professor
Email jinseuk56@gmail.com

Experience

  • 2026 - present

    Seoul, South Korea

    Research Associate Professor
    Research Institute of Advanced Materials (RIAM), Seoul National University
  • 2024 - 2026

    Didcot, United Kingdom

    Postdoctoral Research Associate
    electron Physical Science Imaging Centre (ePSIC), Diamond Light Source
    Funded by the InFUSE Prosperity Partnership.
  • 2022 - 2024

    Seoul, South Korea

    Postdoctoral Research Associate
    Research Institute of Advanced Materials (RIAM), Seoul National University
  • 2015 - 2016

    Icheon-si, Gyeonggi-do, South Korea

    Semiconductor Engineer
    SK Hynix
  • 2010 - 2012

    Seoul, South Korea

    Military Service
    Republic of Korea Air Force
    Honorable discharge.

Education

  • 2017 - 2022

    Seoul, South Korea

    PhD, combined MS/PhD course
    Seoul National University
    Materials Science and Engineering
    • Advisor: Prof. Miyoung Kim.
  • 2009 - 2015

    Seoul, South Korea

    BS
    Seoul National University
    Materials Science and Engineering

Teaching

28th TEM Workshop — Korean Society of Microscopy (20 Jul 2023): Machine learning in TEM analysis: basics and applications.
27th TEM Workshop — Korean Society of Microscopy (28–29 Jul 2022): STEM-derived multi-dimensional data processing in Python-integrated GMS3.
Fundamentals of Computer Science — Department of Materials Science and Engineering, Seoul National University (Sep–Dec 2020):

Skills

(S)TEM experiment and analysis (Advanced)
  • Acquisition on Cs-corrected TEMs including ARM300CF, ARM200CF, JEM-2100F (JEOL), Themis Z, and Tecnai F20 (Thermo Fisher).
  • 4D-STEM, DPC, STEM/EDS/EELS tomography, ptychography, virtual imaging, RDF, FEM, and quantitative chemical analysis.
  • Structure–property analysis across battery and photovoltaic materials, catalytic and plasmonic nanoparticles, amorphous materials, functional oxides, and light-emitting materials.
Microscopy data methods and automation (Advanced)
  • Python and DigitalMicrograph scripting for microscopy analysis (GitHub: jinseuk56).
  • Feature extraction from large microscopy datasets using supervised, unsupervised, and deep-learning methods (DRCA).
  • Electron/EELS tomography (CAETomo), 4D-STEM processing, hardware communication, measurement automation, and concurrent 4D-STEM/EDX acquisition.

Publications

† first or co-first author; * corresponding author.

  • 2026
    Resolving nanoscale heterogeneities in lead halide perovskites through low dose concurrent 4D-STEM-EDX mapping

    J. Ryu†, A. A. Sheader, M. Danaie, D. G. Hopkinson, K. E. MacArthur, N. K. Noel*, C. S. Allen*

    Advanced Materials

    DOI: 10.1002/adma.74382

  • 2026
    Dynamics of dislocation formations and their impacts on exsolution in Ru-doped perovskite oxide

    S. Choi†, Y. Lim†, P. Guha, H. Kim, J. Kim, S. Kim, R. Harder, W. Cha, H. Suh, J. Ryu, S. Yang, H. I. Ji*, D. H. Kwon*, H. Kim*

    Nature Communications

    DOI: 10.1038/s41467-026-73457-7

  • 2026
    4D-STEM Nanoscale Phase Mapping of the Solid-Electrolyte Interphase

    Y. Xu†, J. Ryu, B. Jagger, J. Zhao, M. Pasta*, C. S. Allen*

    ChemRxiv preprint

    DOI: 10.26434/chemrxiv.15000589/v1

  • 2026
    In situ transmission electron microscopy visualization of electric-field-induced phase transitions at the morphotropic phase boundary in Hf0.5Zr0.5O2

    S. Lee†, S. Kim†, J. Ryu†, J. Lee, J. Hong, J. E. Kim, J.-Y. Cha, Y. Shin, D. Kwon, J. H. Yoon, M. H. Park, M. Kim*, S.-Y. Lee*

    ACS Nano

    DOI: 10.1021/acsnano.5c15856

  • 2026
    A hierarchical shell locks and stabilizes perovskite nanocrystals with near-unity quantum yield

    Q. Zeng†, Y. Zhao, S. Park, H. Zhou, H.-J. Shim, T. Li, J. Ryu, M.-J. Sung, X. W. Chua, E. Yoon, B. A. I. Lewis, S.-J. Woo, M. Forzatti, M. J. Kim, E. A. Kim, L. Dai, J. Jang, Y. Tang, J. J. Kweon, T.-W. Lee*

    Science

    DOI: 10.1126/science.ady1370

  • 2025
    Spatio-Compositional Characterization of the Solid Electrolyte Interphase in Solid-State Batteries via Nanobeam Electron Diffraction Microscopy

    J. Ihli*, Y. Chart†, J. Ryu, Y. Liang, P. Y. Huang, H. Guo, D. G. Hopkinson, G. Hughes, Y. Xu, M. Pasta, C. S. Allen*

    Research Square preprint

    DOI: 10.21203/rs.3.rs-7898763/v1

  • 2025
    Sulfur-bearing serpentine in carbonaceous chondrites

    N. Topping†*, J. C. Bridges, L. J. Hicks, L. Petera, C. S. Allen, J. Ryu, D. G. Hopkinson, M. Danaie, L. Blase, F. M. Willcocks, G. Douglas, H. G. Changela, T. Noguchi, T. Matsumoto, A. Miyake

    Meteoritics and Planetary Science

    DOI: 10.1111/maps.70069

  • 2025
    Variable-range hopping conduction in amorphous, non-stoichiometric gallium oxide

    P. Hein†, T. Romstadt, F. Draber, J. Ryu, T. Boeger, A. Falkenstein, M. Kim, M. Martin*

    Advanced Electronic Materials

    DOI: 10.1002/aelm.202400407

  • 2024
    Molecular beam epitaxial In2Te3 electronic devices

    I. Kim†, J. Ryu, E. Lee, S. Lee, S. Lee, W. Suh, J. Lee, M. Kim, H. S. Oh, G.-C. Yi*

    NPG Asia Materials

    DOI: 10.1038/s41427-024-00578-0

  • 2024
    Direct three-dimensional observation of the plasmonic near-fields of a nanoparticle with circular dichroism

    J. Jo†, J. Ryu†, J. H. Huh, H. Kim, D. H. Seo, J. Lee, M. Kwon, S. Lee*, K. T. Nam*, M. Kim*

    ACS Nano

    DOI: 10.1021/acsnano.4c10677

  • 2023
    Iridium-cooperated, symmetry-broken manganese oxide nanocatalyst for water oxidation

    S. Park†, T. Jang†, S. Choi†, Y. H. Lee, K. H. Cho, M. Y. Lee, H. Seo, H. K. Lim, Y. Kim, J. Ryu, S. W. Im, M. G. Kim, J. S. Park, M. Kim, K. Jin, S. H. Kim, G. S. Park, H. Kim, K. T. Nam*

    Journal of the American Chemical Society

    DOI: 10.1021/jacs.3c07411

  • 2023
    Boron-doped amorphous carbon deposited by DC sputtering for a hardmask: Microstructure and dry etching properties

    S. Kim†, U.-g. Kim, J. Ryu, D. Kim, M. Kim, Y.-C. Joo, S.-Y. Lee*

    Applied Surface Science

    DOI: 10.1016/j.apsusc.2023.157895

  • 2022
    Overcharge-induced phase heterogeneity and resultant twin-like layer deformation in lithium cobalt oxide cathode for lithium-ion batteries

    J. Oh†, S. Y. Lee, H. Kim, J. Ryu, B. Gil, J. Lee, M. Kim*

    Advanced Science

    DOI: 10.1002/advs.202203639

  • 2022
    Atomic reconstruction and oxygen evolution reaction of Mn3O4 nanoparticles

    S. Yoon†, H. Seo, K. Jin, H. G. Kim, S. Y. Lee, J. Jo, K. H. Cho, J. Ryu, A. Yoon, Y. W. Kim, J. M. Zuo, Y. K. Kwon, K. T. Nam, M. Kim*

    The Journal of Physical Chemistry Letters

    DOI: 10.1021/acs.jpclett.2c01638

  • 2022
    Correlative study between the local atomic and electronic structures of amorphous carbon materials via 4D-STEM and STEM-EELS

    J. Ryu†, S. Lee†, S. Kim, Y.-C. Joo, M. Kim*

    Applied Physics Letters

    DOI: 10.1063/5.0100925

  • 2021
    Dimensionality reduction and unsupervised clustering for EELS-SI

    J. Ryu†, H. Kim, R. M. Kim, S. Kim, J. Jo, S. Lee, K. T. Nam, Y.-C. Joo, G.-C. Yi, J. Lee, M. Kim*

    Ultramicroscopy

    DOI: 10.1016/j.ultramic.2021.113314

Presentations

† presenter or co-presenter; * corresponding author.

  • 2025
    Concurrent Acquisition of Many 4D-STEM-EDX Data Pairs and Effective Data Analysis Workflow for Beam-sensitive Materials

    J. Ryu†, A. Sheader, M. Danaie, D. Hopkinson, K. MacArthur, N. Noel, C. Allen*

    Oral presentation · EMAG 2025, Manchester, United Kingdom

  • 2025
    Automation of Simultaneous 4D-STEM-EDX Acquisition and Data Analysis for Beam-sensitive Materials

    J. Ryu†, A. Sheader, M. Danaie, D. Hopkinson, K. MacArthur, N. Noel, C. Allen*

    Oral presentation · 13th Asia Pacific Microscopy Congress, Brisbane, Australia

  • 2025
    Mapping Electrical Properties Using STEM-EBIC for Electric Field-Induced Resistance Changes in Amorphous Gallium Oxide

    S. Lee†, J. Ryu, S. Lee, P. Hein, M. Martin, Y. Kim, M. Kim*

    Oral presentation · 13th Asia Pacific Microscopy Congress, Brisbane, Australia

  • 2024
    In-Situ Biasing TEM Analysis of Resistive Switching in Amorphous GaOx for Next-Generation Memory Applications

    S. Lee†, J. Ryu, H. Philipp, M. Martin, M. Kim*

    Oral presentation · Materials Research Society Fall Meeting, Boston, United States

  • 2024
    Ptychography Optimization for Atomic Analysis of Bending Mode in Bilayer Transition Metal Dichalcogenide Translational Motion

    Y. Chang†, J. Ryu, H. Yoo, H. N. Han, M. Kim*

    Oral presentation · 17th European Microscopy Congress, Copenhagen, Denmark

  • 2023
    GPU-based Fast Reconstruction and DL-based Feature Extraction for EELS Tomography

    J. Ryu†, J. Jo, H. Kim, K. T. Nam, M. Kim*

    Oral presentation · 20th International Microscopy Congress, Busan, South Korea

  • 2023
    Exploring Ionic Migration and Structural Evolution in Dielectric Devices

    J. Ryu† (on behalf of Prof. Miyoung Kim), G. Kim, S. Lee, M. Kim*

    Invited talk · 20th International Microscopy Congress, Busan, South Korea

  • 2023
    A Comprehensive Nanoscale Characterization of Amorphous Carbon Films through STEM-EELS and 4D-STEM

    J. Ryu†, S. Lee, S. Kim, Y.-C. Joo, M. Kim*

    Oral presentation · 20th International Microscopy Congress, Busan, South Korea

  • 2023
    Revealing the Resistive Switching Mechanism in Transition Metal Oxide Film Using In-situ Biasing TEM

    S. Lee†, J. Ryu, S. Y. Kim, G. Park, S. D. Hyun, S. Y. Yang, M. Kim*

    Oral presentation · 20th International Microscopy Congress, Busan, South Korea

  • 2023
    Unraveling Surface Plasmon Peak Splitting in Silver Nanoparticles Decorated on ZnO Nanorods via Monochromated STEM EELS Tomography

    J. Jo†, J. Ryu, M. Kim*

    Poster presentation · 20th International Microscopy Congress, Busan, South Korea

  • 2023
    Unsupervised Learning Strategies for Extracting Features from STEM-derived Multi-dimensional Data

    J. Ryu†, J. Jo, S. Lee, M. Kim

    Invited talk · Korea Society of Microscopy Spring Conference, Daejeon, South Korea

  • 2022
    A Machine-learning Approach to Characterization of Amorphous Materials with EELS-SI and 4D-STEM

    J. Ryu†, S. Lee, S. Kim, I. Yoo, Y.-C. Joo, M. Kim*

    Poster presentation · Materials Research Society Spring Meeting, Hawaii, United States

  • 2021
    Three-dimensional Characterization of Nanoparticles with Simultaneously Acquired Bright-field, Dark-field, and Secondary Electron Signals in STEM

    J. Jo†, K. MacArthur, J. Ryu, H. Kim, S. Collins, K. Müller-Caspary, K. Nam, M. Kim, R. E. Dunin-Borkowski*

    Poster presentation · PICO 2021, virtual conference

  • 2020
    Feature Extraction and Reconstruction of Electron Energy Loss Spectroscopy by Non-negative Matrix Factorization

    J. Ryu, J. Jo, J. Lee†, M. Kim*

    Oral presentation · 12th Asia Pacific Microscopy Congress, Hyderabad, India

Awards

  • 2021
    Excellence Prize, Best Paper Award
    Seoul National University and Samsung Electronics R&DB Foundation