Shape Transformation and Bulk Reconstruction in Heated Gold Nanorods
نویسندگان
چکیده
We use molecular dynamic simulations with a quasi-equilibrium heating to study the shape transformations of a nanometer scale gold rod of 2624 atoms. We find that instabilities in the initial {110} surface facets nucleate the shape transformation, leading to the formation of highly stable {111} facets, and causing the fcc interior of the rod to reconstruct to a new orientation consistent with the surface facets. Thus the energetics of the rod surface are responsible for driving the shape transformation.
منابع مشابه
Body- or tip-controlled reactivity of gold nanorods and their conversion to particles through other anisotropic structures.
We report the shape transformation of gold nanorods to spherical nanoparticles, assisted by cupric ions. The reaction proceeds through a series of structures and could be arrested at any stage to produce particles of desired shape. In the presence of a larger concentration of cetyltrimethylammonium bromide (CTAB), selective etching of the tips of the nanorods occurs to a greater extent. The sub...
متن کاملSurface Driven Bulk Reconstruction of Gold Nanorods
The properties of metallic clusters of various shapes, on the nanometer length scale, can be dramatically different from the corresponding bulk material due to their very large surface-to-volume ratio. The unique optical and mechanical properties of such nanoclusters hold great promise for the development of nanotechnology. Gold nanoclusters, for example, have found application in such diverse ...
متن کاملBreathing mode vibrations and elastic properties of single-crystal and penta-twinned gold nanorods.
The acoustic vibrations of individual single-crystal and penta-twinned gold nanorods with widths from ∼7 to ∼26 nm are studied using atomic-level simulations and finite element calculations. It is demonstrated that the continuum model in the limit of an infinite rod length could be used to describe the breathing periods of nanorods with an aspect ratio as small as ∼2.5, in combination with bulk...
متن کاملGiant magnetic susceptibility of gold nanorods detected by magnetic alignment.
We have determined the magnetic properties of single-crystalline Au nanorods in solution using an optically detected magnetic alignment technique. The rods exhibit a large anisotropy in the magnetic volume susceptibility (Δχ(V)). Δχ(V) increases with decreasing rod size and increasing aspect ratio and corresponds to an average volume susceptibility (χ(V)), which is drastically enhanced relative...
متن کاملLSPR and Interferometric Sensor Modalities Combined Using a Double-Clad Optical Fiber
We report on characterization of an optical fiber-based multi-parameter sensor concept combining localized surface plasmon resonance (LSPR) signal and interferometric sensing using a double-clad optical fiber. The sensor consists of a micro-Fabry-Perot in the form of a hemispherical stimuli-responsive hydrogel with immobilized gold nanorods on the facet of a cleaved double-clad optical fiber. T...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2004