Shyam Kumar, C. N. ; Possel, Clemens ; Dehm, Simone ; Chakravadhanula, Venkata Sai Kiran ; Wang, Di ; Wenzel, Wolfgang ; Krupke, Ralph ; Kübel, Christian (2024)
Graphitizability of polymer thin films: an in situ TEM study of thickness effects on nanocrystalline graphene/glassy carbon formation.
In: Macromolecular Materials and Engineering, 309 (1)
doi: 10.1002/mame.202300230
Artikel, Bibliographie
Dies ist die neueste Version dieses Eintrags.
Kurzbeschreibung (Abstract)
Polymer pyrolysis has emerged as a 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 and the properties of the graphenoid material. Using in situ current annealing inside a transmission electron microscope (TEM), the thickness‐dependent structural evolution of the polymer film with a special focus on thickness effects is followed. At high temperatures, thin samples form large graphene layers oriented parallel to the substrate, whereas in thick samples multi‐walled cage‐like structures are formed. Moleclar Dynamics (MD) simulations reveal a 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 the graphitizability of polymers and provide a new understanding of the structural evolution during pyrolysis.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2024 |
| Autor(en): | Shyam Kumar, C. N. ; Possel, Clemens ; Dehm, Simone ; Chakravadhanula, Venkata Sai Kiran ; Wang, Di ; Wenzel, Wolfgang ; Krupke, Ralph ; Kübel, Christian |
| Art des Eintrags: | Bibliographie |
| Titel: | Graphitizability of polymer thin films: an in situ TEM study of thickness effects on nanocrystalline graphene/glassy carbon formation |
| Sprache: | Englisch |
| Publikationsjahr: | Januar 2024 |
| Ort: | Weinheim |
| Verlag: | Wiley-VCH |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Macromolecular Materials and Engineering |
| Jahrgang/Volume einer Zeitschrift: | 309 |
| (Heft-)Nummer: | 1 |
| Kollation: | 11 Seiten |
| DOI: | 10.1002/mame.202300230 |
| Zugehörige Links: | |
| Kurzbeschreibung (Abstract): | Polymer pyrolysis has emerged as a 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 and the properties of the graphenoid material. Using in situ current annealing inside a transmission electron microscope (TEM), the thickness‐dependent structural evolution of the polymer film with a special focus on thickness effects is followed. At high temperatures, thin samples form large graphene layers oriented parallel to the substrate, whereas in thick samples multi‐walled cage‐like structures are formed. Moleclar Dynamics (MD) simulations reveal a 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 the graphitizability of polymers and provide a new understanding of the structural evolution during pyrolysis. |
| Freie Schlagworte: | current annealing, glassy carbon, in situ transmission electron microscopy, nanocrystalline graphene, pyrolysis |
| ID-Nummer: | Artikel-ID: 2300230 |
| Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 600 Technik, Medizin, angewandte Wissenschaften > 600 Technik 600 Technik, Medizin, angewandte Wissenschaften > 660 Technische Chemie |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > In-Situ Elektronenmikroskopie 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Molekulare Nanostrukturen |
| Hinterlegungsdatum: | 29 Mai 2024 05:32 |
| Letzte Änderung: | 30 Jul 2024 08:58 |
| PPN: | 518705102 |
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| Suche nach Titel in: | TUfind oder in Google |
Verfügbare Versionen dieses Eintrags
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Graphitizability of Polymer Thin Films: An In Situ TEM Study of Thickness Effects on Nanocrystalline Graphene/Glassy Carbon Formation. (deposited 28 Mai 2024 12:05)
- Graphitizability of polymer thin films: an in situ TEM study of thickness effects on nanocrystalline graphene/glassy carbon formation. (deposited 29 Mai 2024 05:32) [Gegenwärtig angezeigt]
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