One dimensional nanostructure amongst the following is _____.

Answer: C. Nanofilms

Answer: (c) Nanofilms

In the State Board textbook, nanostructures are classified by the number of dimensions that lie in the nanometre range. A thin film (nanofilm) has only one dimension (its thickness) in the nano range, so it is a one-dimensional nanostructure. Nanotubes and nanorods (and nanowires) have two dimensions in the nano range (two-dimensional), and nanoparticles have all three (three-dimensional).

(If "one-dimensional" meant one dimension outside the nano range, both nanotubes and nanorods would fit and the question would have two answers; with the textbook definition, nanofilm is the only correct option.)