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Optimal acceleration voltage for near-atomic resolution imaging of layer-stacked 2D polymer thin films

Author

Listed:
  • Baokun Liang

    (Universität Ulm)

  • Yingying Zhang

    (Faculty of Chemistry and Food Chemistry & Center for Advancing Electronics Dresden (cfaed), Technische Universität Dresden)

  • Christopher Leist

    (Universität Ulm)

  • Zhaowei Ou

    (Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, School of Chemistry, and State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University)

  • Miroslav Položij

    (Faculty of Chemistry and Food Chemistry & Center for Advancing Electronics Dresden (cfaed), Technische Universität Dresden)

  • Zhiyong Wang

    (Faculty of Chemistry and Food Chemistry & Center for Advancing Electronics Dresden (cfaed), Technische Universität Dresden)

  • David Mücke

    (Universität Ulm)

  • Renhao Dong

    (Faculty of Chemistry and Food Chemistry & Center for Advancing Electronics Dresden (cfaed), Technische Universität Dresden
    Key Laboratory of Colloid and Interface Chemistry of the Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University)

  • Zhikun Zheng

    (Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, School of Chemistry, and State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University)

  • Thomas Heine

    (Faculty of Chemistry and Food Chemistry & Center for Advancing Electronics Dresden (cfaed), Technische Universität Dresden
    Helmholtz Center Dresden-Rossendorf, Institute of Research Ecology, Leipzig Research Branch
    Department of Chemistry, Yonsei University)

  • Xinliang Feng

    (Faculty of Chemistry and Food Chemistry & Center for Advancing Electronics Dresden (cfaed), Technische Universität Dresden
    Max Planck Institute of Microstructure Physics)

  • Ute Kaiser

    (Universität Ulm)

  • Haoyuan Qi

    (Universität Ulm
    Faculty of Chemistry and Food Chemistry & Center for Advancing Electronics Dresden (cfaed), Technische Universität Dresden)

Abstract

Despite superb instrumental resolution in modern transmission electron microscopes (TEM), high-resolution imaging of organic two-dimensional (2D) materials is a formidable task. Here, we present that the appropriate selection of the incident electron energy plays a crucial role in reducing the gap between achievable resolution in the image and the instrumental limit. Among a broad range of electron acceleration voltages (300 kV, 200 kV, 120 kV, and 80 kV) tested, we found that the highest resolution in the HRTEM image is achieved at 120 kV, which is 1.9 Å. In two imine-based 2D polymer thin films, unexpected molecular interstitial defects were unraveled. Their structural nature is identified with the aid of quantum mechanical calculations. Furthermore, the increased image resolution and enhanced image contrast at 120 kV enabled the detection of functional groups at the pore interfaces. The experimental setup has also been employed for an amorphous organic 2D material.

Suggested Citation

  • Baokun Liang & Yingying Zhang & Christopher Leist & Zhaowei Ou & Miroslav Položij & Zhiyong Wang & David Mücke & Renhao Dong & Zhikun Zheng & Thomas Heine & Xinliang Feng & Ute Kaiser & Haoyuan Qi, 2022. "Optimal acceleration voltage for near-atomic resolution imaging of layer-stacked 2D polymer thin films," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-31688-4
    DOI: 10.1038/s41467-022-31688-4
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