KIT | KIT-Bibliothek | Impressum | Datenschutz

Graphitizability of Polymer Thin Films: An In Situ TEM Study of Thickness Effects on Nanocrystalline Graphene/Glassy Carbon Formation

Shyam Kumar, C. N. 1; Possel, Clemens 1; Dehm, Simone 1; Chakravadhanula, Venkata Sai Kiran 1; Wang, Di ORCID iD icon 1,2; Wenzel, Wolfgang 1; Krupke, Ralph ORCID iD icon 1; Kübel, Christian ORCID iD icon 1,2,3
1 Institut für Nanotechnologie (INT), Karlsruher Institut für Technologie (KIT)
2 Karlsruhe Nano Micro Facility (KNMF), Karlsruher Institut für Technologie (KIT)
3 Helmholtz-Institut Ulm (HIU), Karlsruher Institut für Technologie (KIT)

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. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000162009
Veröffentlicht am 06.09.2023
Originalveröffentlichung
DOI: 10.1002/mame.202300230
Scopus
Zitationen: 2
Dimensions
Zitationen: 2
Cover der Publikation
Zugehörige Institution(en) am KIT Helmholtz-Institut Ulm (HIU)
Institut für Nanotechnologie (INT)
Karlsruhe Nano Micro Facility (KNMF)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2023
Sprache Englisch
Identifikator ISSN: 1438-7492, 1439-2054
KITopen-ID: 1000162009
HGF-Programm 43.35.03 (POF IV, LK 01) Structural and Functional Behavior of Solid State Systems
Weitere HGF-Programme 43.31.02 (POF IV, LK 01) Devices and Applications
Erschienen in Macromolecular Materials and Engineering
Verlag John Wiley and Sons
Band 309
Heft 1
Seiten Art.-Nr.: 2300230
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Vorab online veröffentlicht am 23.08.2023
Schlagwörter current annealing, glassy carbon, in situ transmission electron microscopy, nanocrystalline graphene, pyrolysis
Nachgewiesen in Scopus
Web of Science
Dimensions
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
KITopen Landing Page