Presentation 2

Nanocrystalに関する記述。
Semiconductor Nanocrystals as Building Blocks For Devices in Nanotechnology
Prof. Uri Banin
Institute of Chemistry and the center of Nanoscience and Nanotechnology
The Hebrew University of Jerusalem

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Semiconductor nanocrystals manifest unique size and shape dependent properties with both basic and applied significance.

They serve as a model system for the evolution of properties from the molecular regime to the solid state, and more emerging as building blocks of devices in Nanotechnology. A particular attractive property is the wavelength tenability from the UV to the NIR achieved by size, shape and composition control and showing some notable advantageous properties compared to other emitters. An example of harnessing this emission to a devices is the preparation of composite nanocrystal/polymer light emitting diodes exhibitingelectroluminescence in the near-IR telecom range. An additional example is the use of nanocrystals as fluorescent tags in biology and medical diagnostics.

Furthermore, modifications of the colloidal synthesis conditions provide shape control allowing for the preparation of rod shaped particles, quantum rods. Rods, compared to spherical nanocrystals, are easier to contact to nano-electrode architectures enabling single electron transistor structures but the issue of parallel wiring presents still a significant challenge. To address this we developed the growth of metal tips on the apexes of semiconductor rods, forming ‘nano-dumbbells’ (NDB’s),via a simple chemical reaction.T.mokari, E. Rothenberg, I. Popov, U.Banin, Science 304, 1787(2004).

Such NDBs manifest two sided chemical connectivity and serve as a unique model for metal-semiconductor nanoscale junction. The metal tips cloud be used for electrical connections and for self assembling rods to nanoelectronic circuitry.

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