Carbon nanotube in different shapes

Carbon nanotubes (CNTs) have been well studied theoretically and experimentally. Perfect CNTs have a crystalline structure formed by hexagonal network; defects cause the tubule to curve. CNTs with different tubule morphologies have their own special properties and potential applications. So far, many different shapes, such as straight, waved, coiled, and branched, are predicted, observed, and target synthesized. This article reviews CNTs in different shapes formed during growth, their morphologies and their possible applications.