This talk will demonstrate new molecular-level concepts [Refs. 1,2] for constructing nanoscopic metal oxide objects (such as single-walled nanotubes) of controlled dimensions. We show that the formation of single-walled metal oxide nanotubes takes place in aqueous conditions via a mechanism involving the formation, condensation, and rearrangement of molecular precursors that have intrinsic curvature. We then show that the curvature of these precursors can be controlled in a subtle manner by the use of anionic ligands (both inorganic and organic), and that the precursors can then be shaped into nanotubes whose diameter is controlled with �ngstrom-level precision. Finally, we elucidate the mechanism of nanotube growth and demonstrate a model that has predictive capabilities for the scale-up of nanotube synthesis. Throughout the talk, we will emphasize the integration of multiple experimental and computational techniques � including electrospray ionization mass spectrometry, cryo-electron microscopy, NMR, light scattering, and quantum chemical calculations � to elucidate the reactive behavior of nanotube-forming systems at multiple length scales. References:  [1] S. Nair et al, Nano Letters, 12 (2), p. 827-832 (2012). [2] S. Nair et al, Journal of the American Chemical Society, 133(14), p. 5397-5412 (2011).

Shaping nanoscopic objects from precursors of controlled curvature

244th National Meeting (2012)

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