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Published May 1, 2007 | public
Journal Article Open

A plausible mechanism for the evolution of helical forms in nanostructure growth


The observation of helices and coils in nano-tube/-fiber (NT/NF) syntheses is explained on the basis of the interactions between specific catalyst particles and the growing nanostructure. In addition to rationalizing nonlinear structure, the proposed model probes the interplay between thermodynamic quantities and predicts conditions for optimal growth. Experimental results on the effect of indium catalyst on affecting the coil pitch in NTs and NFs are presented.

Additional Information

©2007 The American Physical Society (Received 16 February 2007; accepted 2 March 2007; published online 9 May 2007) We gratefully acknowledge support from the National Science Foundation (Grants No. ECS-05–08514 and DMI-0304019) and the Office of Naval Research (Award number N00014–06–1-0234). We also appreciate the use of the facilities at the National Center for Electron Microscopy (NCEM) at the Lawrence Berkeley National Laboratory, Berkeley, CA.


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