Anisotropic assembly of colloidal nanoparticles: Exploiting substrate crystallinity

作者：Hayton James A^*; Pauliac Vaujour Emmanuelle; Moriarty Philip J

来源：Nano, 2007, 2(6): 361-365.

DOI：10.1142/S1793292007000714

• nanoparticle
• self-assembly
• self-organization
• anisotropic assembly
• scanning probe microscopy

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 similar to 2nm 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.

• 出版日期2007-12