Synthesis of Carboxylated-Graphenes by the Kolbe-Schmitt Process

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F17%3A43913398" target="_blank" >RIV/60461373:22310/17:43913398 - isvavai.cz</a>
Result on the web
<a href="http://pubs.acs.org/doi/abs/10.1021/acsnano.6b07746" target="_blank" >http://pubs.acs.org/doi/abs/10.1021/acsnano.6b07746</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1021/acsnano.6b07746" target="_blank" >10.1021/acsnano.6b07746</a>

Result language
angličtina
Original language name
Synthesis of Carboxylated-Graphenes by the Kolbe-Schmitt Process
Original language description
Graphene oxide is an oxidized form of graphene containing a large variety of oxygen groups. Although past models have suggested carboxylic acids to be present in significant amounts, recent evidence has shown otherwise. Toward the production of carboxyl-graphene, a synthetic method is presented herein based on the Kolbe- Schmitt process. A modified procedure of heating graphite oxide in the presence of a KOH/CaO mixture results in up to 11 atom % of carboxylic groups. The graphite oxide starting material and reaction temperature were investigated as two important factors, where a crumpled morphology of graphite oxide flakes and a lower 220 degrees C temperature preferentially led to greater carboxyl functionalization. Successful carboxylation caused a band gap opening of similar to 2.5 eV in the smallest carboxyl graphene particles, which also demonstrated a yellow fluorescence under UV light unseen in its counterpart produced at 500 degrees C. These results are in good agreement with theoretical calculations showing band gap opening and spin polarization of impurity states. This demonstrates the current synthetic process as yet another approach toward tuning the physical properties of graphene.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10402 - Inorganic and nuclear chemistry

Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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