Nanocrystals

Nanocrystals are molecular-sized solids formed with a repeating, 3D pattern of atoms or molecules with an equal distance between each part. Nanocrystals are aggregates of anywhere from a few hundred to tens of thousands of atoms that combine into a crystalline form of matter known as a 'cluster'. Typically around 10nm in diameter, nanocrystals are larger than molecules but smaller than bulk solids and therefore frequently exhibit physical and chemical properties somewhere in-between. Nanocrystals are believed to have potential in optical electronics because of their ability to change the wavelength of light.

Nanoscale solid formed with a periodic lattice of atoms, ions or molecules.

Source:
IoN. Glossary of Terms
BSI. PAS 71:2005. Vocabulary - Nanoparticles