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

2. 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

3. Quantum dots Karl Hiekel
Nanotechnology
Quantum dots
Karl Hiekel

4. Outline Quantum dots Quantum size effect Synthesis of QDs InP/ZnS QDs

5. Quantum dots Semiconductors Nanocrystals Photoluminescence
(1)
Semiconductors
Nanocrystals
Photoluminescence
Common QDs: CdSe, InP
(2)
(1 )
(2) SIZE.jpg

6. Possible applications: LEDs, Laser, solar cells, catalyst, biolabeling
Quantum dots
(3)
Possible applications: LEDs, Laser, solar cells, catalyst, biolabeling
(4)
(5)
(3)
(4)
(5)

7. -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.

8. 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) levels.jpg

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

10. Synthesis of QDs
Hot injektion - seperation of nucleation and growth - prefending Ostwald ripening - small size distribution
(10)
(9)
(9)
(10)

11. 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

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