Service Communautaire d'Information sur la Recherche et le Développement - CORDIS

Periodic Report Summary 1 - NANOCF (Tuning the properties of NanoCarbon with Fluorination)

The network NanoCF is designed to exploit the potential of fluorinated nanocarbon materials for application in electronics, photonics, or biomedicine. A multidisciplinary approach will be applied ranging from fundamental research in chemistry and physics to studying the materials properties for technological innovation. The work is based on preparation, modification and characterization of the carbon nanotubes, graphene and few-layered graphite. This work is supplemented by very successful theoretical modelling.
A detailed atomistic model has been developed showing the precise fluorination process of graphite, starting from Br2, followed by slow fluorination with BrF3 including predictions of intermediate structures. An entirely new model of local atomic defects in fluorinated graphene has been established, which predicts ferromagnetic behavior, and shows exactly how the defects couple, and migrate. This provides a first explanation of experimental results.
Graphene and few-layered graphene have been prepared using intercalation compounds of graphite fluoride C2F with different guest molecules. Semifluorinated graphite (C2F)n was synthesized using gaseous BrF3, which acted as a fluorinating agent, was diluted with Br2 to optimize the fluorination process.
Reactive centers on the surface of graphite fluoride were created by removal of fluorine atoms with a hydrazine vapor treatment. Such treatment preserves the backside fluorination. Sensing properties of the back-side fluorinated graphene to ammonia gas are significantly enhanced in comparison with pristine graphene.
Vertically alingned carbon nanotubes (vCNT) have been fluorinated in plasma using an argon-fluorine mixture precursor gas and the parallel grafting of oxygen present in the background vacuum has been achieved. The analysis of the impact of functionalization on pristine nanotube structure was supported by data acquired from Raman and photoemission spectroscopy.
Thus different routes for the fluorination of carbon nanomaterials have been successfully applied. Resulting materials have been characterized in their structure and their electronic properties using spectroscopic techniques. The understanding benefits from a detailed theoretical modelling.


Sandra Martinka, (EU-Referentin, LEAR)
Tél.: +49 3514658599
Fax: +49 351465898599


Life Sciences