Selective Synthesis of Gold Cuboid and Decahedral Nanoparticles Regulated and Controlled by Cu²⁺ Ions

Abstract

It is found that Cu 2+ is an effective agent for the controlled preparation of shaped gold nanoparticles. As the concentration of Cu 2+ increases from 0 mM to 0.2 mM to 1.6 mM, the shape of the gold nanoparticles changes from rod to cuboid to decahedron. A possible mechanism based on selectively retarding the growth rate of the {111} plane is proposed.

Electrochemical Reactivity at Free and Supported Gold Nanocatalysts Surface

“…The measured interplanar spaces for all lattice fringes from high-resolution transmission electron microscopy images correspond to the values obtained from electron diffraction and XRD data [18,19]. As an example, the measured interplanar space of 2.35 Å is in good agreement with the (1 1 1) lattice plane of face-centered-cubic (fcc) of gold [18,19]. The surface energy (γ) associated with different crystallographic facets of fcc metal types is described as follows: γ(1 1 1) < γ(1 0 0) < γ(1 1 0) [20].…”

“…The kinetic growth in the {100} direction seems to be superior to that in the {1 1 1} direction, which promotes the development of (1 1 1) facets. The measured interplanar spaces for all lattice fringes from high-resolution transmission electron microscopy images correspond to the values obtained from electron diffraction and XRD data [18,19]. As an example, the measured interplanar space of 2.35 Å is in good agreement with the (1 1 1) lattice plane of face-centered-cubic (fcc) of gold [18,19].…”

Shape-dependent electrocatalytic activity of free gold nanoparticles toward glucose oxidation

“…It could therefore allow electrocatalytic reactions with great selectivity. The details of the synthesis process were reported elsewhere [5,14,16,28]. .…”

“…The preferential adsorption of CTAB on the gold surface allows the preparation of nanoparticles with specific shape and surface crystallographic orientation. It is found that some metallic cations added to the growth solution, such as Cu 2+ or Ag + , are effective agents that favor the control of the NPs' shape [14,16]. In fact, Cu 2+ ions are adsorbed on (111) facets, selectively retarding their growth rate and preferentially leading to a particle growth along (100) facets [16].…”

“…It is found that some metallic cations added to the growth solution, such as Cu 2+ or Ag + , are effective agents that favor the control of the NPs' shape [14,16]. In fact, Cu 2+ ions are adsorbed on (111) facets, selectively retarding their growth rate and preferentially leading to a particle growth along (100) facets [16]. The role of Ag + is similar but promotes the rod-shaped growth [14].…”