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Understanding the market
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Project goals
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CdSe Nanocrystal "Ink" Synthesis
There are a variety of techniques to synthesize colloidal solutions of Cadmium Selenide. However, long, bulky ligands are also formed (and attached to the nanocrystals) during synthesization. In the reaction these Native Ligands are used advantageously, to control crystal growth, nucleation, and to prevent nanocrystals from agglomerating in solution. Once it is time for the CdSe nanoparticles to perform, for instance in a semiconducting thin film, the ligands act as insulation to the nanocrystals and destroy the carrier mobility of the semiconductor. For this reason, in conjunction with the possibilities for new nanoparticle-fueled semiconductors, much research is currently underway with the focus of Native Ligand Exchange. Click Here for more info on techniques for Native Ligand Exchange.
The Ligand Exchange technique that will be highlighted here, involves a colloidal exchange of Native Ligands for the Thiocyanate precursor, the 1,2,3,4-thiatriazole-5-thiolate anion (TTT-). CdSe nanocrystals with TTT- ligands (called CdSe(TTT)) have long term stability in solution, which would allow for synthesis of large volumes of nanoparticles without the need for immediate printing onto the water purification system. Upon mild heating of >100C, TTT- readily thermolyzes into to the small, minimally insulating ligand Thiocynate, which is commonly used in the formation of high quality nanocrystal semiconductor films.
Design
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Costs
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Discussion
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Next steps
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Conclusions
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References
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Contact details
Alex Poznak APoznak@mtu.edu
Bill Price wjprice@mtu.edu Template:MY3701