Question

Top down and bottom up approach in nanotechnology comparison

Answer 1

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There are two approaches to the synthesis of nanomaterials and the fabrication of nanostructures: top-down and bottom-up.

Bottom- Up approach refers to the build-up of a material from the bottom: atom-by-atom, molecule-by-molecule, or cluster-by-cluster which are of nanoscale range i.e 1 nm to 100 nm or self-assembly of atoms and molecules as in chemical and biological systems. This approach promises better opportunities to obtain nanostructures with less defects, more homogeneous chemical composition, and better short and long range ordering as compared to top-down approach (etching away material, as in building integrated circuits)

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