Shyam Kumar, C. N. ; Chakravadhanula, Venkata Sai Kiran ; Riaz, Adnan ; Dehm, Simone ; Wang, Di ; Mu, Xiaoke ; Flavel, Benjamin ; Krupke, Ralph ; Kübel, Christian (2017)
Understanding the graphitization and growth of free-standing nanocrystalline graphene using in situ transmission electron microscopy.
In: Nanoscale, 9 (35)
doi: 10.1039/C7NR03276E
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Graphitization of polymers is an effective way to synthesize nanocrystalline graphene on different substrates with tunable shape, thickness and properties. The catalyst free synthesis results in crystallite sizes on the order of a few nanometers, significantly smaller than commonly prepared polycrystalline graphene. Even though this method provides the flexibility of graphitizing polymer films on different substrates, substrate free graphitization of freestanding polymer layers has not been studied yet. We report for the first time the thermally induced graphitization and domain growth of free-standing nanocrystalline graphene thin films using in situ TEM techniques. High resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED) and electron energy loss spectroscopy (EELS) techniques were used to analyze the graphitization and the evolution of nanocrystalline domains at different temperatures by characterizing the crystallinity and domain size, further supported by ex situ Raman spectroscopy. The graphitization was comparable to the substrate supported heating and the temperature dependence of graphitization was analyzed. In addition, the in situ analysis of the graphitization enabled direct imaging of some of the growth processes taking place at different temperatures.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2017 |
| Autor(en): | Shyam Kumar, C. N. ; Chakravadhanula, Venkata Sai Kiran ; Riaz, Adnan ; Dehm, Simone ; Wang, Di ; Mu, Xiaoke ; Flavel, Benjamin ; Krupke, Ralph ; Kübel, Christian |
| Art des Eintrags: | Bibliographie |
| Titel: | Understanding the graphitization and growth of free-standing nanocrystalline graphene using in situ transmission electron microscopy |
| Sprache: | Englisch |
| Publikationsjahr: | 20 Juli 2017 |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Nanoscale |
| Jahrgang/Volume einer Zeitschrift: | 9 |
| (Heft-)Nummer: | 35 |
| DOI: | 10.1039/C7NR03276E |
| URL / URN: | https://doi.org/10.1039/C7NR03276E |
| Kurzbeschreibung (Abstract): | Graphitization of polymers is an effective way to synthesize nanocrystalline graphene on different substrates with tunable shape, thickness and properties. The catalyst free synthesis results in crystallite sizes on the order of a few nanometers, significantly smaller than commonly prepared polycrystalline graphene. Even though this method provides the flexibility of graphitizing polymer films on different substrates, substrate free graphitization of freestanding polymer layers has not been studied yet. We report for the first time the thermally induced graphitization and domain growth of free-standing nanocrystalline graphene thin films using in situ TEM techniques. High resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED) and electron energy loss spectroscopy (EELS) techniques were used to analyze the graphitization and the evolution of nanocrystalline domains at different temperatures by characterizing the crystallinity and domain size, further supported by ex situ Raman spectroscopy. The graphitization was comparable to the substrate supported heating and the temperature dependence of graphitization was analyzed. In addition, the in situ analysis of the graphitization enabled direct imaging of some of the growth processes taking place at different temperatures. |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Molekulare Nanostrukturen 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 12 Feb 2018 14:48 |
| Letzte Änderung: | 12 Feb 2018 14:48 |
| PPN: | |
| Sponsoren: | CNSK greatly acknowledges the PhD funding from the Deutscher Akademischer Austauschdienst (DAAD). BSF gratefully acknowledges the support from the Deutsche Forschungsgemeinschaft (DFG) under grant numbers FL 834/ 1-1 and FL 834/2-1., RK acknowledges funding by the DFG under INST 163/354-1 FUGG. |
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