Controlling Length of Gold Nanowires with Large-Scale:  X-ray Absorption Spectroscopy Approaches to the Growth Process

Abstract

By utilizing the X-ray absorption approach, the gold ions evolving from the Au-Cl complex to Au rods have been elucidated. The theoretical simulation of X-ray absorption spectra further revealed the evolution of gold and concluded that ultrafine small clusters of gold (Au 13 ) formed after a reducing agent was added to the growth solution. A redesigned seed-assisted growth method, a serial addition of growth solution, was employed to achieve the goal of the consecutive support of gold. The development approach was found to successfully fabricate 1D gold nanorods/wires with a tunable size from 50 nm to 1.7 µm.

A New Approach to Solar Hydrogen Production: a ZnO–ZnS Solid Solution Nanowire Array Photoanode

“…Extended X-ray absorption fi ne structure (EXAFS) is a shortrange probe of structure and yielded results concerning local correlations around the absorbing atom, specifi cally the nearest neighbor interatomic distances and coordination numbers. [27][28][29] EXAFS was conducted to obtain better evidence of the structural parameters of ZnO-ZnS solid solution nanowire arrays. Figure 4 shows the Zn K-edge of ZnO and ZnO-ZnS [ 30 ] To compare with pristine ZnO nanowire, the electronic transition to p state along the c axis increased with the formation of ZnO-ZnS solid solution, indicating that orbital coupling occurred in c axis direction of ZnO nanowire.…”

More power to X‐rays: New developments in X‐ray spectroscopy

“…The Ru-Ru distance in the Ru nanocluster catalysts was measured to be 2.6Å. In another study, growth of gold nanoparticles was monitored with XAS by Chen et al [127]. They found that small gold nanoclusters such as Au 13 were formed immediately after the introduction of the reducing agent into the gold acidic solution.…”

Synthesis and assembly of anisotropic nanoparticles

“…For selective adhesion of surfactant, after seed formation, organic molecules, strongly bind to specific crystal plane (e.g., high surface energy), provide kinetic control to extend along one-direction upon growing of the nanostructures [23]. Liu et al reported that addition of serial growth aqueous solution with gold precursor (HAuCl 4 ) into the gold seed solution at 30 s intervals created Au nanorods [23].…”

“…Liu et al reported that addition of serial growth aqueous solution with gold precursor (HAuCl 4 ) into the gold seed solution at 30 s intervals created Au nanorods [23]. The evolution of the Au nanorods by a serial addition of growth solution was investigated through X-ray absorption spectra.…”