Question

Difference between top down and bottom up approach in nanotechnology

Answer 1

Answer:

Top-down and bottom-up methods are two types of approaches used in nanofabrication. The bottom-up approach is more advantageous than the top-down approach because the former has a better chance of producing nanostructures with less defects, more homogenous chemical composition, and better short- and long-range ordering.

A bottom up synthesis method implies that the nanostructures are synthesized onto the substrate by stacking atoms onto each other, which gives rise to crystal planes, crystal planes further stack onto each other, resulting in the synthesis of the nanostructures. A bottom-up approach can thus be viewed as an synthesis approach where the building blocks are added onto the substrate to form the nanostructures.

A top down synthesis method implies that the nanostructures are synthesized by etching out crystals planes (removing crystal planes) which are already present on the substrate. A top-down approach can thus be viewed as an approach where the building blocks are removed from the substrate to form the nanostructure.

Answer 2

Explanation:

1. top down and bottom up approach in nanotechnology by it is the most commonly used Input and pointing device that helps you and lets you select more and items on the screen