One-pot synthesis of corolla-shaped gold nanostructures with (110) planes.

In this work, corolla-shaped gold nanostructures with (110) planes were successfully synthesized using ethylenediaminetetraacetic acid (EDTA) and polyvinylpyrrolidone (PVP) as the co-reductants and shape-directing agents. The structure and the mechanism of the nanostructures were investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and electrochemical characterization. On the basis that surface energies of different gold crystallographic planes are in the order (111) < (100) < (110), the (110) plane has the highest surface energy among the low-index planes.

One-pot one-step synthesis of Au@SiO core-shell nanoparticles and their shell-thickness-dependent fluorescent properties.

Herein, we report a one-pot one-step method for the preparation of Au@SiO core-shell nanoparticles (NPs) a facile heating treatment of an alcoholic-aqueous solution of chloroauric acid (HAuCl), 2-methylaminoethanol (2-MAE), cetyltrimethylammonimum bromide (CTAB), and tetraethylorthosilicate (TEOS). The size of the Au core and the thickness of the silica shell can be easily controlled by simply adjusting the volume of HAuCl and TEOS, respectively, which can hardly be achieved by other approaches. The as-prepared Au@SiO core-shell NPs exhibited shell-thickness-dependent fluorescent properties.