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Quantum dots are also sometimes referred to as artificial atoms, a term that emphasizes that a quantum dot is a single object with bound, discrete electronic states, as is the case with naturally occurring atoms or molecules.
Their optoelectronic properties change as a function of both size and shape.
Larger QDs (diameter of 5–6 nm, for example) emit longer wavelengths resulting in emission colors such as orange or red.
Consequently, the specific recognition properties of the virus can be used to organize inorganic nanocrystals, forming ordered arrays over the length scale defined by liquid crystal formation. (2000) were able to create self-assembled, highly oriented, self-supporting films from a phage and Zn S precursor solution.
This system allowed them to vary both the length of bacteriophage and the type of inorganic material through genetic modification and selection.
Highly ordered arrays of quantum dots may also be self-assembled by electrochemical techniques.
A template is created by causing an ionic reaction at an electrolyte-metal interface which results in the spontaneous assembly of nanostructures, including quantum dots, onto the metal which is then used as a mask for mesa-etching these nanostructures on a chosen substrate.Over time, the monomer concentration diminishes, the critical size becomes larger than the average size present, and the distribution "defocuses".There are colloidal methods to produce many different semiconductors.Heating the solution at high temperature, the precursors decompose forming monomers which then nucleate and generate nanocrystals.Temperature is a critical factor in determining optimal conditions for the nanocrystal growth.Typical dots are made of binary compounds such as lead sulfide, lead selenide, cadmium selenide, cadmium sulfide, cadmium telluride, indium arsenide, and indium phosphide.Tags: Adult Dating, affair dating, sex dating