Anisotropic Assembly of Colloidal Nanoparticles: Exploiting Substrate Crystallinity

Hayton, JA and Pauliac-Vaujour, E and Moriarty, P (2007) Anisotropic Assembly of Colloidal Nanoparticles: Exploiting Substrate Crystallinity. Nano, 2 (6). p. 361.

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Official URL: http://www.worldscinet.com/cgi-bin/details.cgi?id=pii:S1793292007000714&type=html

Abstract

We show that the crystal structure of a substrate can be exploited to drive the anisotropic assembly of colloidal nanoparticles. Pentanethiol-passivated Au particles of approximately 2 nm diameter deposited from toluene onto hydrogen-passivated Si(111) surfaces form linear assemblies (rods) with a narrow width distribution. The rod orientations mirror the substrate symmetry, with a high degree of alignment along principal crystallographic axes of the Si(111) surface. There is a strong preference for anisotropic growth with rod widths substantially more tightly distributed than lengths. Entropic trapping of nanoparticles provides a plausible explanation for the formation of the anisotropic assemblies we observe.

Item Type:Article
Additional Information:Electronic version of an article published as Nano, 2, 6, 2007, 361-5] [10.1142/S1793292007000714] © [copyright World Scientific Publishing Company] [http://www.worldscinet.com/nano/nano.shtml]
Uncontrolled Keywords:nanoparticles; self-assembly; self-organisation; dewetting; silicon; anisotropic; nanorods
Schools/Departments:Faculty of Science > School of Physics and Astronomy
ID Code:906
Deposited By:Moriarty, P.J.
Deposited On:19 May 2008 14:38
Last Modified:19 May 2008 14:38

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