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Understanding the graphitization and growth of free-standing nanocrystalline graphene using in situ transmission electron microscopy

Shyam Kumar, C. N. and Chakravadhanula, Venkata Sai Kiran and Riaz, Adnan and Dehm, Simone and Wang, Di and Mu, Xiaoke and Flavel, Benjamin and Krupke, Ralph and Kübel, Christian (2017):
Understanding the graphitization and growth of free-standing nanocrystalline graphene using in situ transmission electron microscopy.
9, In: Nanoscale, (35), pp. 12835-12842, ISSN 2040-3364, DOI: 10.1039/C7NR03276E,
[Online-Edition: https://doi.org/10.1039/C7NR03276E],
[Article]

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.

Item Type: Article
Erschienen: 2017
Creators: Shyam Kumar, C. N. and Chakravadhanula, Venkata Sai Kiran and Riaz, Adnan and Dehm, Simone and Wang, Di and Mu, Xiaoke and Flavel, Benjamin and Krupke, Ralph and Kübel, Christian
Title: Understanding the graphitization and growth of free-standing nanocrystalline graphene using in situ transmission electron microscopy
Language: English
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.

Journal or Publication Title: Nanoscale
Volume: 9
Number: 35
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Fachgebiet Molekulare Nanostrukturen
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 12 Feb 2018 14:48
DOI: 10.1039/C7NR03276E
Official URL: https://doi.org/10.1039/C7NR03276E
Funders: 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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