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- W4375853835 abstract "High-temperature annealing is an effective way to heal the defects of graphene-based nanocarbons and enhance their crystallinity. However, the thermally induced vibration of the graphene building blocks often leads to unfavorable micro-, nano-structural evolution including layer stacking. Herein, the key structural factors to achieve highly crystalline graphene frameworks with desired microstructures upon annealing at 1800 °C is revealed. The structural changes of fullerenes, single-walled carbon nanotubes, and graphene-based porous frameworks are precisely analyzed by their structural parameters, such as the total number of graphene edge sites and precise graphene stacking structures, using a novel advanced vacuum temperature-programmed desorption technique up to 1800 °C. The stacked structure is differentiated into loose and tightly stacking, where the loosely stacked structure is found to induce further stacking at high-temperature. Moreover, a graphene framework with an inner space size of greater than 4–7 nm is beneficial to avoid structural change upon high-temperature annealing. These findings offer both a fundamental understanding of the solid-state chemistry of nanocarbons under high temperatures and a viable strategy for engineering edge-site free graphene frameworks with pre-designed microstructures. The structural retention degree (SRD) is established as a numerical descriptor for the thermal stability of carbon materials. The loosely stacked structure and high surface curvature (represented by inner space size <4–7 nm) are responsible for diminished SRD of nanocarbons, as they are able to trigger the stacking of basal plane during high-temperature annealing." @default.
- W4375853835 created "2023-05-10" @default.
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- W4375853835 date "2023-06-15" @default.
- W4375853835 modified "2023-10-14" @default.
- W4375853835 title "Structural Engineering of Nanocarbons Comprising Graphene Frameworks <i>via</i> High-Temperature Annealing" @default.
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- W4375853835 doi "https://doi.org/10.1246/bcsj.20230053" @default.
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