First annual workshop in “Advances in Nanophotonics” Heraklion, Crete, Greece. 10th-13th October 2005 The assembling of semiconductor and metal nanocrystals Nikolai Gaponik, Alexey Shavel, Lehui Lu, Alexander Eychmüller Institute of Physical Chemistry and Electrochemistry, Technical University of Dresden 01062 Dresden, GERMANY Institute of Physical Chemistry, University of Hamburg 20146 Hamburg, GERMANY
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First annual workshop in “Advances in Nanophotonics”Heraklion, Crete, Greece. 10th-13th October 2005
The assembling of semiconductorand metal nanocrystals
Nikolai Gaponik, Alexey Shavel, Lehui Lu,Alexander Eychmüller
Institute of Physical Chemistry and Electrochemistry,Technical University of Dresden
01062 Dresden, GERMANYInstitute of Physical Chemistry, University of Hamburg
20146 Hamburg, GERMANY
First annual workshop in “Advances in Nanophotonics”Heraklion, Crete, Greece. 10th-13th October 2005
Content
Introduction
Synthesis and characterization of nanocrystals
Formation of nanocomposites:•LbL assembly•Chemical conjugation•Solvent controlled precipitation•Electrostatic assembly and chemical plating•1D assemblies
Conclusions
First annual workshop in “Advances in Nanophotonics”Heraklion, Crete, Greece. 10th-13th October 2005
Why nanocrystals?
•Size-dependent physico-chemical properties
•High photoluminescence quantum yields
•Narrow emission (color purity)
•Broad continous absorption bands
•High stability against photodegradation
•Solution processable photonics and optoelectronics
•Specific: solubility in water and compatibility withcommon buffers at physiological concentrations
First annual workshop in “Advances in Nanophotonics”Heraklion, Crete, Greece. 10th-13th October 2005
Why assembly, self-assembly, templating?
There is a lack of methods allowing controllableinsertion of nano-objects (particles, molecules,composites, etc.) in photonic and optoelectronicmicro(nano)structures
First annual workshop in “Advances in Nanophotonics”Heraklion, Crete, Greece. 10th-13th October 2005
Disordered hollow Au/Pt spheres(a) and semispheres (b)
Selective Fabrication of Ordered BimetallicNanostructures with Hierarchical Porosity
First annual workshop in “Advances in Nanophotonics”Heraklion, Crete, Greece. 10th-13th October 2005
1. Synthesis and post preparative treatment of luminescent NCs :•PL QE in solutions of up to 60%•PL in UV-blue, visible and NIR spectral regions•compatibility with non-polar (toluene, chloroform etc.) and polar organic(DMF, THF, DMSO etc.) solvents
2. Various composite materials with luminescent NCs:•core-shell micro/nano particles (silica, glass) with NC shells•modified planar and 3D structures including layered opal heterostructures•polymers with incorporated NCs•microencapsulated NCs•self-assembled nanowires•3D structures with hierarchical porosity
3. Potential applications in photonics, LED, optical labelling,...
Summary
First annual workshop in “Advances in Nanophotonics”Heraklion, Crete, Greece. 10th-13th October 2005
Acknowledgements
Trinity College DublinYu. RakovichJ. DoneganYu. Volkov S. Mitchell
LMU- MunichA.L.RogachJ. FeldmannD. S. KoktyshA. S. SushaT. Franzl