No abstract

No abstract

Self-organization of a two-dimensional array of nanoholes which were formed by anodic oxidation of aluminum was investigated quantitatively using fast Fourier transformation (FFT) analysis of scanning electron microscopy (SEM) images. The highly ordered array of nanoholes with diameters of 26 nm was obtained by two-step anodization at anodic voltage around 40 V, and oxalic acid concentration of 0.5 M. A two-dimensional ordered array of Au free standing nanowires was successfully fabricated by the deposition of Au using DC electroplating in nanoholes of aluminum oxide, by removal of the aluminum oxide barrier layer using wet chemical etching. The present method has a high efficiency to fabricate ordered nanowire array of a variety of conductive materials in a large area, and wide applications for fabricating quantum effect devices and materials would be expected.

Articles you may be interested inVariation in surface plasmonic response due to the reorganization of Au nanoparticles in Langmuir-Blodgett film J. Appl. Phys. 116, 024316 (2014); 10.1063/1.4890034 GO and RGO based FETs fabricated with Langmuir-Blodgett grown monolayers AIP Conf.Nanoscale organized assembly of nanoparticulate TiO 2 -stearate monolayers through the Langmuir-Blodgett method J.A highly ordered monolayer film of alkanethiol-encapsulated gold nanoparticles was fabricated on a silicon substrate by using the Langmuir-Blodgett ͑LB͒ method. The effects on the particle order, of the particle concentration and the type of solvent of the LB spreading suspension of encapsulated gold particles, were studied. We found that a low particle concentration of 0.06 -0.3 mg/mL in chloroform is optimal for the fabrication of high quality gold particle monolayers. Since the proposed method is not restricted to gold particles, it is believed to be a practical process for fabricating quantum dot structures of various particle sizes and compositions.

The effects of the surface pressure on the particle arrangement of Langmuir-Blodgett (LB) monolayers of alkanethiol-capped gold nanoparticles were studied. The LB monolayers were prepared from a highly concentrated particle solution, which increases film fabrication efficiency but readily causes small particle voids in the particle array. Overcompressing the LB monolayer to a high surface pressure restructured the particles and eliminated the voids. When the gold particles capped by dodecanethiol were 8.5 nm in diameter, the particle arrangement was vastly improved and a wafer-scale LB monolayer was transferred onto a substrate at the surface pressure of 20 mN/m.

Bottom-up fill of Cu in deep submicrometer via holes was achieved through electroless plating alone for the first time. We investigated the effect of addition of inhibitor molecules to electroless Cu plating solution, and found that sulfopropyl sulfonate ͑SPS͒ was highly effective in promoting the bottom-up fill. The tendency for bottom-up filling was enhanced by shrinkage of the hole diameter. This suggests that the diffusion flux of SPS molecules to the bottom of holes was more suppressed for smaller holes. Thus, the Cu deposition rate near the hole bottom is larger than that outside the hole, leading to bottom-up filling.

No abstract

In this article, we present an experimental study of the formation of a Langmuir–Blodgett (LB) monolayer of alkanethiol-encapsulated gold particles. We developed a procedure for preparing the LB spreading suspension from an aqueous gold colloid, and we fabricated a large-scale densely packed monolayer of alkanethiol-encapsulated particles covering an entire substrate using the LB technique. Scanning electron microscopy observations demonstrated that this LB monolayer is composed of domains of ordered close-packed encapsulated gold particles, some of which extended to about 10 μm in extent. A detailed study of the forming mechanism of the LB monolayer of gold particles indicates that the ordered particle domains were formed by a self-organization process induced by the evaporation of the spreading suspension before LB compression. These domains were then aggregated to a densely packed monolayer by the compression process. The proposed method provides a feasible procedure for fabricating a variety of new nanostructured materials.