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Chae, Han Gi
Polymer nano-composites and Carbon Fiber Laboratory (P&C Lab)
Research Interests
  • Polymer Physics/ Processing, Carbon Nano-materials, Ultra high performance/ multifuctional nano-composites, Smart textile/ fiber

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Structure evolution mechanism of highly ordered graphite during carbonization of cellulose nanocrystals

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Title
Structure evolution mechanism of highly ordered graphite during carbonization of cellulose nanocrystals
Author
Eom, YounghoSon, Sung MinKim, Yea EunLee, Jung-EunHwang, Sang-HaChae, Han Gi
Issue Date
2019-09
Publisher
Pergamon Press Ltd.
Citation
CARBON, v.150, pp.142 - 152
Abstract
The microstructural evolution of highly ordered graphite during high temperature carbonization of cellulose nanocrystals (CNC) was traced in the temperature range of 1000–2500 °C. It was interesting to note that the direct carbonization of CNC under inert environment led to an irregular morphology due to molecular fusion whereas oxidative stabilization at 250 °C under air and subsequent carbonization preserved the pristine needle-like structure of the CNC during carbonization. Various characterizations such as high resolution transmission electron microscopy (HRTEM), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS) exhibited that the carbonization of CNC undergoes three distinctive stages of structural changes depending on carbonization temperature: (1) formation of turbo-stratic graphitic structure below 1500 °C (1st stage), (2) phase conversion to polycrystalline graphite between 1500 and 2000 °C (2nd stage), and (3) in-plane homogenization to highly ordered graphite above 2000 °C (3rd stage).
URI
https://scholarworks.unist.ac.kr/handle/201301/26643
URL
https://www.sciencedirect.com/science/article/pii/S0008622319304701
DOI
10.1016/j.carbon.2019.05.007
ISSN
0008-6223
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