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Functional carbon allotropes
New synthetic carbon allotropes – carbon nanotubes (CNTs) and graphene – play a central role in the development of novel, high-performance materials within the Central Institute for New Materials and Process Technology. Due to their exceptional electronic and mechanical properties, both carbon modifications would be promising integral components in future high-tech applications. However, both polydisperse materials are hardly processable without chemical modification of the surfaces, as they are intrinsically insoluble in both aqueous media and organic solvents. The group "Functional Carbon Allotropes" under the leadership of Prof. Dr. Andreas Hirsch and Dr. Frank Hauke deals with the fundamental chemical modification of both carbon allotropes, both by supramolecular self-organization (non-covalent functionalization). as well as by direct derivatization of the corresponding carbon frameworks (covalent functionalization). In addition to basic scientific research on reactivity patterns, the focus is also on modulating the material and surface properties of these new carbon modifications. The targeted implementation of functional anchor groups serves as a key step to connect further molecular building blocks (fullerenes, porphyrins, dendrimers, calixarenes) and thus to combine the property profile of carbon nanotubes and graphene with the material characteristics of other groups of substances.
Graphene – a layer of the hexagonal carbon network of graphite – can be represented by appropriate activation and exfoliation of the individual graphite layers from this ubiquitously available source material. Graphene flakes of different sizes are formed and in addition to the desired single-layer carbon network, flakes with a higher number of layers are also formed. This polydispersity represents a fundamental challenge for the microscopic and spectroscopic characterization of these systems. In carbon nanotubes, the polydispersity goes beyond the pure "molecular size" because the material consists of single tubes of different lengths, varying diameters and different chiralities (rolling direction of the single graphene layer to the tube). the composition. However, the last point has a fundamental influence on the intrinsic electronic properties of carbon nanotubes, Thus, a further focus of the working group "Functional Carbon Allotropes" is not only the chemical modification but also the separation of the polydisperse mixtures in order to develop a uniform property profile.
The third research focus is on the detailed characterization of functional carbon allotropes, which is only possible through the interdisciplinary use of a variety of complementary spectroscopic and microscopic analysis methods.
The work of the research group "Functional Carbon Allotropes" is thematically fixed in a number of DFG individual projects, in the BMBF joint project "Skalagraph", in the "Advanced Investigator Grant" – GRAPHENOCHEM – of the ERC, in the CRC 583 "Redoxactive metal complexes: Reactivity control by molecular architectures". "and the Cluster of Excellence "Engineering of Advanced Materials".
Functional carbon allotropes
New synthetic carbon allotropes – carbon nanotubes (CNTs) and graphene – play a central role in the development of novel, high-performance materials within the Central Institute for New Materials and Process Technology. Due to their exceptional electronic and mechanical properties, both carbon modifications would be promising integral components in future high-tech applications. However, both polydisperse materials are hardly processable without chemical modification of the surfaces, as they are intrinsically insoluble in both aqueous media and organic solvents. The group "Functional Carbon Allotropes" under the leadership of Prof. Dr. Andreas Hirsch and Dr. Frank Hauke deals with the fundamental chemical modification of both carbon allotropes, both by supramolecular self-organization (non-covalent functionalization). as well as by direct derivatization of the corresponding carbon frameworks (covalent functionalization). In addition to basic scientific research on reactivity patterns, the focus is also on modulating the material and surface properties of these new carbon modifications. The targeted implementation of functional anchor groups serves as a key step to connect further molecular building blocks (fullerenes, porphyrins, dendrimers, calixarenes) and thus to combine the property profile of carbon nanotubes and graphene with the material characteristics of other groups of substances.
Graphene – a layer of the hexagonal carbon network of graphite – can be represented by appropriate activation and exfoliation of the individual graphite layers from this ubiquitously available source material. Graphene flakes of different sizes are formed and in addition to the desired single-layer carbon network, flakes with a higher number of layers are also formed. This polydispersity represents a fundamental challenge for the microscopic and spectroscopic characterization of these systems. In carbon nanotubes, the polydispersity goes beyond the pure "molecular size" because the material consists of single tubes of different lengths, varying diameters and different chiralities (rolling direction of the single graphene layer to the tube). the composition. However, the last point has a fundamental influence on the intrinsic electronic properties of carbon nanotubes, Thus, a further focus of the working group "Functional Carbon Allotropes" is not only the chemical modification but also the separation of the polydisperse mixtures in order to develop a uniform property profile.
The third research focus is on the detailed characterization of functional carbon allotropes, which is only possible through the interdisciplinary use of a variety of complementary spectroscopic and microscopic analysis methods.
The work of the research group "Functional Carbon Allotropes" is thematically fixed in a number of DFG individual projects, in the BMBF joint project "Skalagraph", in the "Advanced Investigator Grant" – GRAPHENOCHEM – of the ERC, in the CRC 583 "Redoxactive metal complexes: Reactivity control by molecular architectures". "and the Cluster of Excellence "Engineering of Advanced Materials".
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