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Microscopic Visualization of Porous Nanographenes Synthesized through a Combination of Solution and On-Surface Chemistry
Published on: March 4, 2021
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Structural Studies of Hydrographenes
Elena Vishnyakova1, Gaowei Chen1, Bruce E Brinson1
1Department of Chemistry and The Smalley-Curl Institute, Rice University , 6100 Main Street, Houston, Texas 77005 United States.
Accounts of Chemical Research
|May 10, 2017
Summary
Researchers explored hydrographenes, a functionalized graphene, using Birch reduction. This process transforms graphene into an insulator, revealing potential for new applications in materials science.
Area of Science:
- Materials Science
- Nanotechnology
- Organic Chemistry
Background:
- Graphene's unique properties drive scientific interest.
- Exfoliating graphene from graphite is challenging due to strong van der Waals forces.
- Lithium graphenide formation via electron transfer is a key exfoliation method.
Purpose of the Study:
- Investigate hydrographenes derived from various graphite types via Birch reduction.
- Characterize the structure and properties of hydrographenes.
- Explore the reversibility of graphene functionalization.
Main Methods:
- Birch reduction for graphene functionalization.
- Solid-state 13C NMR spectroscopy for structural analysis.
- High-resolution transmission electron microscopy (HR-TEM) for morphological studies.
Main Results:
- Hydrographenes exhibit isolated aromatic rings surrounded by saturated rings, not benzene clusters.
- NMR confirmed residual solvents (tert-butyl alcohol, ethanol) within hydrographene layers.
- HR-TEM showed morphological changes, including dislocations and increased layer spacing, especially in annealed graphite derivatives.
- Repetitive hydrogenation increased graphitic layer spacing; heating reversed this, restoring graphite structure.
Conclusions:
- Birch reduction provides a route to hydrographenes with distinct structural features.
- Hydrographene formation is reversible, with heating restoring the graphite lattice.
- The study highlights potential applications for functionalized graphene materials.
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