Journal of Advances in Nanomaterials

9

Authors: Junlong Li, Caixia Kan, Yang Liu, Juan Xu, Changshun Wang, Yuan Ni, Shanlin Ke

Shapes and structures of seeds are critically important for the seed-mediated synthesis of anisotropic nanostructures. By the deposition of Cu atoms on different Au seeds, Cu nanostructures of different shapes could be synthesized. In experiments Cu nanorods formed with Au nanobipyramids as seeds, and the growth of Cu nanorods was studied through a series of experiments. It is found that the growth direction Cu nanorod is along the penta-twinned axis of Au nanobipyramids and bound by {200} side facets. For the case of low Cu2+ concentration in reaction system, Cu atoms would prefer to deposit on one end of Au nanobipyramids. Nevertheless, Cu atoms would deposit on two ends of Au nanobipyramids for the case of high Cu2+ concentration. Due to the different deposition and migration rates of Cu atoms at two ends of Au nanobipyramids, the Cu nanorods products exhibited different morphologies. Similarly, Cu nanopolyhedrons and Cu nanocubiods were synthesized with Au nanospheres and nanorods as seeds, respectively. Our work is of great significance for further fundamental research and applications of the Cu nanostructure-based nanomaterials in catalytic and electronic fields.

11

Authors: Jean-Pierre Aime, Juan Elezgaray, Oscar Mendoza

In this note we investigate the diffusive behaviour and the boundary conditions of DNA nanodevices using the toe hold mediated strand displacement method. The goal is to extract the basic principles governing the difference observed in diluted solution and in confined environment where the devices are tethered on a DNA Origami. We note that the excluded volume interaction between the two strands running in opposite direction must give a sub diffusive behaviour that can lead to very long waiting times between jumps. When the Boundary Conditions generate a strong asymmetry in the device, the probability to perform the logical operation, thus to remove the output strand, is one. However, we envision unexpected marked differences between diluted solutions and confined environment both for controlling the boundary condition and the sub diffusive behaviour. These differences rise new questions on the interest to use the toe hold mediated strand displacement method on DNA Origamis