David Harting, Karl Hiekel, Karl Wegner, Richard Weichelt

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David Harting, Karl Hiekel, Karl Wegner, Richard Weichelt Nanotechnology David Harting, Karl Hiekel, Karl Wegner, Richard Weichelt

Topics Karl Hiekel Quantum dots Richard Weichelt Capping of CdTe NPs with DNA strands and their assembly on DNA origami structures David Harting Nanoparticles and diatoms Karl Wegner Flame spray pyrolysis 17.07.2014

Quantum dots Karl Hiekel Nanotechnology Quantum dots Karl Hiekel

Outline Quantum dots Quantum size effect Synthesis of QDs InP/ZnS QDs 17.07.2014

Quantum dots Semiconductors Nanocrystals Photoluminescence (1) Semiconductors Nanocrystals Photoluminescence Common QDs: CdSe, InP (2) (1 )http://web.mit.edu/kastner-group/Images/dotsmonolayer.jpg 16.07.2014 (2) http://www.materials360online.com/data/images/full/2147495596/2147495596_FULL_ SIZE.jpg 16.07.2014 17.07.2014

Possible applications: LEDs, Laser, solar cells, catalyst, biolabeling Quantum dots (3) Possible applications: LEDs, Laser, solar cells, catalyst, biolabeling (4) (5) (3) http://9circuits.com/blog/2011/09/19/electronics-101-basic-circuit-design/, 16.07.2014 (4) http://www.laserfest.org/lasers/images/nero1.jpg 16.07.2014 (5) http://www.treehugger.com/renewable-energy/40-efficient-solar-cells-they-are-being-used-back-on-earth.html, 16.07.2014 17.07.2014

-Separation of band gaps to energy levels in smaller particles Quantum size effect -Semiconductors -Separation of band gaps to energy levels in smaller particles (6) (7) (7) Waurisch, C. Thermodynamic and kinetic investigations into the syntheses of CdSe and CdTe nanoparticles; TU Dresden, 2012. (8) Weller, H. Angew. Chemie 1993, 105, 43–55. 17.07.2014

Quantum size effect (6) Brus, L. J. Phys. Chem. 1986, 90, 2555–2560.   (8) (8) (6) Brus, L. J. Phys. Chem. 1986, 90, 2555–2560. (9) http://upload.wikimedia.org/wikipedia/commons/9/97/Exciton_energy_ levels.jpg 17.07.2014 17.07.2014

Synthesis of QDs Two options: - top down e.g. etching, lithography - bottom up e.g. hot injektion 17.07.2014

Synthesis of QDs Hot injektion - seperation of nucleation and growth - prefending Ostwald ripening - small size distribution (10) (9) (9) http://www.chm.tu-dresden.de/pc2/graphics/reaction.png 17.07.2014 (10) http://www.chm.tu-dresden.de/pc2/graphics/hotinjection.png 16.07.2014 17.07.2014

InP/ZnS QDs - Consisting of non-toxic materials - Photoluminescence covers wide area - Shell enhances particles (11) (11) V. Brunetti et al, Nanoscale, 2013, 5, 307–317 17.07.2014

17.07.2014

Erste Gliederungsebene zweite Gliederungsebene dritte Gliederungsebene vierte Gliederungsebene fünfte Gliederungsebene 17.07.2014

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