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  Preparation of Carbon Nanosheets at Room Temperature

Schrettl, S., Schulte, B., Stefaniu, C., Oliveira, J., Brezesinski, G., & Frauenrath, H. (2016). Preparation of Carbon Nanosheets at Room Temperature. Journal of visualized experiments, 109: e53505. doi:doi:10.3791/53505.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-2A9A-2 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002C-7E1B-C
Genre: Journal Article

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 Creators:
Schrettl, Stephen, Author
Schulte, Bjoern, Author
Stefaniu, Cristina1, Author              
Oliveira, Joana1, Author              
Brezesinski, Gerald1, Author              
Frauenrath, Holger, Author
Affiliations:
1Gerald Brezesinski, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863500              

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Free keywords: Chemistry, oligoynes, amphiphiles, self-assembled monolayers, air-water interface, room temperature carbonization, nanosheets, carbon nanostructures
 Abstract: Amphiphilic molecules equipped with a reactive, carbon-rich "oligoyne" segment consisting of conjugated carbon-carbon triple bonds self-assemble into defined aggregates in aqueous media and at the air-water interface. In the aggregated state, the oligoynes can then be carbonized under mild conditions while preserving the morphology and the embedded chemical functionalization. This novel approach provides direct access to functionalized carbon nanomaterials. In this article, we present a synthetic approach that allows us to prepare hexayne carboxylate amphiphiles as carbon-rich siblings of typical fatty acid esters through a series of repeated bromination and Negishi-type cross-coupling reactions. The obtained compounds are designed to self-assemble into monolayers at the air-water interface, and we show how this can be achieved in a Langmuir trough. Thus, compression of the molecules at the air-water interface triggers the film formation and leads to a densely packed layer of the molecules. The complete carbonization of the films at the air-water interface is then accomplished by cross-linking of the hexayne layer at room temperature, using UV irradiation as a mild external stimulus. The changes in the layer during this process can be monitored with the help of infrared reflection-absorption spectroscopy and Brewster angle microscopy. Moreover, a transfer of the carbonized films onto solid substrates by the Langmuir-Blodgett technique has enabled us to prove that they were carbon nanosheets with lateral dimensions on the order of centimeters.

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 Dates: 20162016
 Publication Status: Published in print
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Title: Journal of visualized experiments
  Other : Journal of visualized experiments: JoVE
  Abbreviation : J. Vis. Exp.
Source Genre: Journal
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Publ. Info: Rockville Pike, Bethesda MD : JoVE
Pages: - Volume / Issue: 109 Sequence Number: e53505 Start / End Page: - Identifier: ISSN: 1940-087X