nanoparticles or nanoparticles

Nanoparticles or nanoparticles denote a composite of a few to a few thousand atoms or molecules. The name comes from its size, which is typically at 1 to 100 nanometers.

One nanometer equals 10−9 = 0,000000001 meters. The prefix "nano" derives from the Greek "nanos" for "dwarf" or "dwarfish".