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TUD · Technische Universität Dresden

TUD logoThe TUD group has a long lasting expertise in modeling, synthesis, characterisation, functionalisation and assembling of colloidal semiconductor and metal nanocrystals (NCs). Semiconductor nanocrystals also known as quantum dots have attracted considerable attention because of their appealing optical properties such as strong, narrow, and tuneable (quantum confinement) photoluminescence with quantum yields in the region of 30-95% and full-width-half-maximums (FWHM) of 20-50 nm. Amongst other attractive properties of NCs are their high extinction coefficients (at least an order of magnitude higher than organic dyes), stability (common for inorganic materials), and variable surface functionalities which determine their processability. Metal nanocrystals possess pronounced surface plasmon resonances which are size-dependent and remarkably sensitive to the chemical composition of the nanocrystal surface. The combination of all these properties makes both metal and semiconductor NCs very promising for a variety of active applications in nanophotonics and optoelectronics, including LEDs, solar cells, lasing, optical sensors, colour conversion layers, bioimaging, etc. Assembly approaches are considered as important tools for nanotechnology allowing a predictable and reproducible handling and addressing of nanoobjects. The TUD group is an expert in the layer-by-layer electrostatic assembly, solvent-controlled precipitation, covalent linking, gelation, 1D assembling by oriented attachment, nanoparticle self-assembly, fabrication of robust all-inorganic composites, etc. These methods being applied to the variety of available nanocrystals allow the fabrication of functional composites possessing desirable properties as demanded by the particular nanophotonic and optoelectronic application.

Partner: TUD

Group Leader: Alexander Eychmüller

Websitehttp://www.chm.tu-dresden.de/pc2/

Available Resources

  • Chemical laboratories, equipped with Schlenk lines and gloveboxes for the synthesis of semiconductor and metal nanocrystals under inert atmosphere
  • UV-Vis-NIR spectrofluorimeter Fluorolog 3 equipped for static and time-resolved fluorescence spectroscopy with sub-nanosecond resolution. Spectral region: 300 – 1700 nm.
  • UV-Vis-NIR spectrometer Cary 5000 (Varian), equipped with mirror reflection and integrated sphere setups. Spectral region: 200 – 2500 nm

TUD nanocrystals

Key Personnel

Alexander Eychmüller studied physics at the University of Göttingen. In 1987 he obtained his Ph.D. on proton transfer reactions at the MPI. After a postdoctoral year at UCLA working he joined the group of Prof. A. Henglein in Berlin. In 1994 he moved with Prof. H. Weller to the University of Hamburg to study photophysical and structural properties of semiconductor NCs. He habilitated in 1999 and the venia legendi in 2000 and was offered a chair in Physical Chemistry and Electrochemistry of the TUD in 2005.

Nikolai Gaponik obtained his Ph.D. (2000) in Minsk working on the photoelectrochemistry of the composite materials based on conducting polymers and NCs. He worked as a visiting scientist at the LMU Munich with Prof. J. Feldmann in 2000 and later as postdoc with Prof. H. Weller in Hamburg. Since 2005 he is a senior scientist at the TUD. Current research interest focuses on the synthesis, assembly and applications of nanocrystals. He is an author of more than 90 articles in refereed journals.

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