There are a variety of nanostructures like nanocomposites, nanowires, nanopowders, nanotubes, fullerenes nanoﬁbers, nanocages, nanocrystallites, nanoneedles, nanofoams, nanomeshes, nanoparticles, nanopillars, thin ﬁlms, nanorods, nanofabrics, quantumdots etc.
Nanostructures can be classified on the basis of the grain structure and size there are made up of.