Atomic-scale determination of surface facets in gold nanorods

作者：Goris Bart; Bals Sara^*; Van den Broek Wouter; Carbo Argibay Enrique; Gomez Grana Sergio; Liz Marzan Luis M; Van Tendeloo Gustaaf

来源：Nature Materials, 2012, 11(11): 930-935.

DOI：10.1038/NMAT3462

It is widely accepted that the physical properties of nanostructures depend on the type of surface facets(1,2). For Au nanorods, the surface facets have a major influence on crucial effects such as reactivity and ligand adsorption and there has been controversy regarding facet indexing(3,4). Aberration-corrected electron microscopy is the ideal technique to study the atomic structure of nanomaterials(5,6). However, these images correspond to two-dimensional (2D) projections of 3D nano-objects, leading to an incomplete characterization. Recently, much progress was achieved in the field of atomic-resolution electron tomography, but it is still far from being a routinely used technique. Here we propose a methodology to measure the 3D atomic structure of free-standing nanoparticles, which we apply to characterize the surface facets of Au nanorods. This methodology is applicable to a broad range of nanocrystals, leading to unique insights concerning the connection between the structure and properties of nanostructures.

• 出版日期2012-11