Shape-Controlled Electrodeposition of Gold Nanostructures

Abstract

A one-step, nontemplated, low-cost electrochemical method for the growth of gold nanostructures with different shapes is reported here. It is the first time that nanopyramidal, nanorod-like, and spherical gold nanostructures were fabricated on polycrystalline gold substrates through electrochemical overpotential deposition (OPD) by easily manipulating the deposited potentials and concentrations of HAuCl4. X-ray diffraction and electrochemical analyses revealed that the pyramidal structures are more extensively dominated by (111) facets in comparison with the other nanostructures. The nanopyramids, which have anisotropic structures, exhibited broad extinction over the visible region, most likely due to plasmon resonance. Oxygen reduction activity of a gold electrode with the pyramidal structures was lower than those of the electrodes with the other nanostructures since the activity at the gold (111) surface is lower than that at the (100) and (110) surfaces.

Evaluation of Electrodeposited Gold Nanostructures for Applications in QCM Sensing

“…A more negative electrode potential did not increase h, w and h/w significantly in all of the conditions mentioned here, indicating that the potential in this range does not affect the growth speed and mode. Various morphologies have been reported, involving pyramidal, 10 pinlike, 19 spherical, 10,13,19 and flower-like 15 structures by changing the deposition condition. The analysis demonstrated here is expected to allow quantitative analysis of the surface morphology and to facilitate a prompt understanding of the tendency about the structure growth by choosing an appropriate representative size.…”

Effect of the Chain Length of a Modified Layer and Surface Roughness of an Electrode on Impedimetric Immunosensors

“…31,32 In this study the two-step electrodepositing method was used to form the sea urchin-like AuNSs, as shown in Figs. 1(e) and 1(f ).…”

Genosensor for SARS Virus Detection Based on Gold Nanostructured Screen‐Printed Carbon Electrodes

“…Electrochemical and wet-chemical methods are demonstrated to be effective approaches to make metal nanostructures under control without addition of a reducing agent or protecting agent [6,7].…”