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  2. Graphitizability of polymer thin films: an in situ TEM study of thickness effects on nanocrystalline graphene/glassy carbon formation
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    Dataset: Graphitizability of polymer thin films: an in situ TEM study of thickness effects on nanocrystalline graphene/glassy carbon formation

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    Alternate identifier:
    -
    Related identifier:
    (Is Identical To) https://publikationen.bibliothek.kit.edu/1000159975 - URL
    Creator/Author:
    Kumar, C. N. Shyam [Institut für Nanotechnologie (INT), Karlsruher Institut für Technologie (KIT)]

    Possel, Clemens [Institut für Nanotechnologie (INT), Karlsruher Institut für Technologie (KIT)]

    Dehm, Simone [Institut für Nanotechnologie (INT), Karlsruher Institut für Technologie (KIT)]

    Chakravadhanula, Venkata Sai Kiran [Helmholtz-Institut Ulm (HIU), Karlsruher Institut für Technologie (KIT)]

    Wang, Di https://orcid.org/0000-0001-9817-7047 [Institut für Nanotechnologie (INT), Karlsruher Institut für Technologie (KIT), Karlsruhe Nano Micro Facility (KNMF), Karlsruher Institut für Technologie (KIT)]

    Wenzel, Wolfgang [Institut für Nanotechnologie (INT), Karlsruher Institut für Technologie (KIT)]

    Krupke, Ralph https://orcid.org/0000-0001-8427-8592 [Institut für Nanotechnologie (INT), Karlsruher Institut für Technologie (KIT)]

    Kübel, Christian https://orcid.org/0000-0001-5701-4006 [Institut für Nanotechnologie (INT), Karlsruher Institut für Technologie (KIT), Karlsruhe Nano Micro Facility (KNMF), Karlsruher Institut für Technologie (KIT)]
    Contributors:
    -
    Title:
    Graphitizability of polymer thin films: an in situ TEM study of thickness effects on nanocrystalline graphene/glassy carbon formation
    Additional titles:
    -
    Description:
    (Abstract) Polymer pyrolysis has emerged as a simple and versatile method to synthesize graphenoid (graphene like) materials with varying thickness and properties. The morphology of the thin film, especially the thickness, greatly affects the graphitizability (ability to from ordered graphene/ graphite) and th... Polymer pyrolysis has emerged as a simple and versatile method to synthesize graphenoid (graphene like) materials with varying thickness and properties. The morphology of the thin film, especially the thickness, greatly affects the graphitizability (ability to from ordered graphene/ graphite) and thus the properties of the resulting graphenoid material. Using in situ current annealing inside a transmission electron microscope (TEM), we followed the thickness-dependent structural evolution of the polymer film with a special focus on thickness effects. Up to intermediate temperatures, the structural evolution during current annealing is similar to the evolution during thermal annealing of the thin films. At higher temperatures, thin samples form large graphene layers oriented parallel to the substrate, whereas in thick samples multi-walled cage-like structures are formed. MD simulations reveal a critical film thickness of 40 Å below which, the carbonized layers align parallel to the surface. For thicker samples, the orientation of the layers becomes increasingly misoriented starting from the surface to the center. This structural change can be attributed to the formation of bonded multi-layers from the initially unsaturated activated edges. The resulting cage-like structures are stable even during simulated annealing at temperatures as high as 3500 K. An atomistic understanding of the formation of these structures is presented. The results clearly indicate the critical effect of thickness on graphitizability of polymers and provide a new understanding of the structural evolution during pyrolysis.

    Polymer pyrolysis has emerged as a simple and versatile method to synthesize graphenoid (graphene like) materials with varying thickness and properties. The morphology of the thin film, especially the thickness, greatly affects the graphitizability (ability to from ordered graphene/ graphite) and thus the properties of the resulting graphenoid material. Using in situ current annealing inside a transmission electron microscope (TEM), we followed the thickness-dependent structural evolution of the polymer film with a special focus on thickness effects. Up to intermediate temperatures, the structural evolution during current annealing is similar to the evolution during thermal annealing of the thin films. At higher temperatures, thin samples form large graphene layers oriented parallel to the substrate, whereas in thick samples multi-walled cage-like structures are formed. MD simulations reveal a critical film thickness of 40 Å below which, the carbonized layers align parallel to the surface. For thicker samples, the orientation of the layers becomes increasingly misoriented starting from the surface to the center. This structural change can be attributed to the formation of bonded multi-layers from the initially unsaturated activated edges. The resulting cage-like structures are stable even during simulated annealing at temperatures as high as 3500 K. An atomistic understanding of the formation of these structures is presented. The results clearly indicate the critical effect of thickness on graphitizability of polymers and provide a new understanding of the structural evolution during pyrolysis.

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    (Technical Remarks) Information on the data formats provided in the individual subdirectories

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    Keywords:
    In-situ TEM
    Related information:
    -
    Language:
    -
    Publishers:
    Karlsruhe Institute of Technology
    Production year:
    2022
    Subject areas:
    Engineering
    Resource type:
    Dataset
    Data source:
    -
    Software used:
    -
    Data processing:
    -
    Publication year:
    2023
    Rights holders:
    Kumar, C. N. Shyam

    Possel, Clemens

    Dehm, Simone

    Chakravadhanula, Venkata Sai Kiran

    Wang, Di https://orcid.org/0000-0001-9817-7047

    Wenzel, Wolfgang

    Krupke, Ralph https://orcid.org/0000-0001-8427-8592

    Kübel, Christian https://orcid.org/0000-0001-5701-4006
    Funding:
    -
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    Name Storage Metadata Upload Action
    Status:
    Published
    Uploaded by:
    kitopen
    Created on:
    2023-06-30
    Archiving date:
    2023-07-04
    Archive size:
    213.7 MB
    Archive creator:
    kitopen
    Archive checksum:
    9d7468e58d4f93d11cba9f21b5cf5777 (MD5)
    Embargo period:
    -
    The metadata was corrected retroactively. The original metadata will be available after download of the dataset.
    dataset/Graphitizability of polymer thin films: an in situ TEM study of thickness effects on nanocrystalline graphene/glassy carbon formation
    DOI: 10.35097/1606
    Publication date: 2023-07-04
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    Rights statement for the dataset
    This work is licensed under
    CC BY-NC 4.0
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    Cite Dataset
    Kumar, C. N. Shyam; Possel, Clemens; Dehm, Simone; et al. (2023): Graphitizability of polymer thin films: an in situ TEM study of thickness effects on nanocrystalline graphene/glassy carbon formation. Karlsruhe Institute of Technology. DOI: 10.35097/1606
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