In this podcast quantum dots are used to explain the wonders of bottom up-nano-fabrication. Quantum dots are crystals made of a combination of metal and metalloid atoms that emits light under certain conditions of excitement. These crystals contain a few hundred atoms each, making their dimensions of tens of nanometers. The most important property that the crystals display is the emission of defined electromagnetic radiation which wavelength depends uniquely on their size, not the material used to make it.

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