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Bromine polycondensation in pristine and fluorinated graphitic carbons
Olga V Sedelnikova1, Christopher P Ewels, Dmitry V Pinakov
1Nikolaev Institute of Inorganic Chemistry SB RAS, 3 Academician Lavrentiev Av., Novosibirsk 630090, Russian Federation. o.sedelnikova@gmail.com.
Nanoscale
|August 7, 2019
Summary
Researchers discovered two distinct bromine structures within graphitic carbons using Raman spectroscopy. Fluorine catalysis drives bromine molecules to form chains, revealing new insights into carbon-bromine interactions.
Area of Science:
- Materials Science
- Chemistry
- Spectroscopy
Background:
- The behavior of bromine within graphitic carbon materials has been a long-standing area of research with unclear findings.
- Understanding these interactions is crucial for developing advanced carbon-based materials.
Purpose of the Study:
- To elucidate the precise structures and behaviors of bromine species within graphitic carbon materials.
- To differentiate bromine interactions in pristine versus fluorinated graphitic carbons.
Main Methods:
- Raman spectroscopy was employed to analyze bromine structures in graphitic carbons.
- Density Functional Theory (DFT) calculations were utilized to assign observed Raman spectral features.
Main Results:
- Two distinct types of bromine structures were identified: intercalated Br2 molecules (similar to liquid bromine) and Br3-based chains.
- Bromination of pristine and low-fluorinated graphitic carbons yielded significantly different Raman spectra.
- Fluorine acts as a catalyst, promoting the formation of Br3 chains from Br2 molecules through charge transfer.
Conclusions:
- The study reveals a fluorine-catalyzed mechanism for bromine chain formation in graphitic carbons.
- This mechanism is general and applicable to various carbon defect sites, including edges.
- The findings provide a detailed understanding of bromine intercalation and transformation in functionalized carbon materials.
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