# Ammonium lithocholate nanotubes:stability and copper metallization

Terech, Pierre and Neralagatta, M. and Sangeetha, NM and Bhat, Shreedhar and Allegraud, Buhler and Buhler, Eric (2006) Ammonium lithocholate nanotubes:stability and copper metallization. In: Soft Matter, 2 (6). pp. 517-522.

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## Abstract

Ammonium lithocholate nanotubes $(NH_{4}LC)$ have been prepared in alkaline ammonia solutions and exhibited remarka ble monodisperse cross-sectional dimensions (external diameter = 52 nm) as shown by cryo-transmission electron microscopy measurements. A classical electroless metallic replication method was used with a single poly(ethylene-imine) PEI layer coating the negatively charged$NH_{4}LC$ nanotubes. Short copper rods (external diameter ${\sim}$ 80 nm) were observed by scanning electron microscopy that corresponded to the original organic templates. The results obtained in acidic conditions are analyzed in terms of the lifetime of the self-assembled structures and formation of bundles of tubes. Dynamic light scattering measurements and optical observations show that the system in the presence of controlled amounts of hydrochloric acid is stable enough to account for a metallic replication in acidic conditions. An average apparent diffusion coefficient of the organic $NH_{4}LC$ assemblies is extracted $(D \sim 9.8 \times10{^5} nm{^2}S{^-1})$ in homogeneous suspensions where bundles have been dispersed by the acidic additions.

Item Type: Journal Article Publisher Copyrigt of this article belongs to Royal Society of Chemistry. Materials Science,Multidisciplinary;Integral-Equations; Nanowires;Tubules;Route Division of Chemical Sciences > Organic Chemistry 03 Dec 2008 10:00 19 Sep 2010 04:53 http://eprints.iisc.ernet.in/id/eprint/16783