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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 44: Poster: Biomaterials and Biopolymers

CPP 44.4: Poster

Mittwoch, 9. März 2016, 18:15–21:00, Poster B2

Fluorescence properties of Graphene Quantum Dots and Graphene Oxide derived by the thermolysis of citric acid — •Christian Wimmenauer, Stefan Fasbender, and Thomas Heinzel — Heinrich Heine Universität Düsseldorf

Fluorescent graphene quantum dots (GQDs) and graphene oxide (GO) are prepared by thermal decomposition of citric acid. The influence of different heating temperatures and different durations of the thermolysis on the fluorescence properties of GQDs and GO are investigated and a sharp distinction in the absorbance spectra of GQDs and GO is observed. Atomic Force Microscopy is used to determine the GQDs size and shape and the GQDs are sorted by size using dialysis membranes with different membrane pore sizes. Dialysis in deionized water is realized to obtain a pure aqueous GQD solution of pH = 7, allowing the possible use in bioimaging applications.