Self-assembled hexagonal Au particle networks on silicon from Au nanoparticle solution

Abstract

Self-assembled hexagonal Au particle networks, 2–12 μm in cell size, on silicon have been achieved by a simple method. Honeycomb structure of Au nanoparticles on silicon was drop cast from the Au nanoparticle solution under appropriate concentration, evaporation rate, substrate temperature, and humidity. Hexagonal networks with discrete Au particles were generated in samples annealed in N2 ambient. Two-step annealing, i.e., annealing at 400 °C followed by annealing at 1000 °C for 1 h each was found to be effective to improve the regularity of the Au particle network. As the cell size can be adjusted by the tuning of the deposition conditions, the scheme promises to be an effective patterning method without complex lithography.

Structural changes in gradient colloidal thin gold films deposited from aqueous solution

“…Due to the increased amount of colloidal solution near the barrier and the pinning of the three-phase contact line at the barrier, a one-dimensional concentration gradient in close vicinity to the barrier is installed. This is in contrast to drying drops, where typical ring-shaped patterns were observed (Deegan et al, 1997;Deegan, 2000, Su et al, 2004. Similar to drying drops, the patterned regions are small compared with the wetted area.…”

“…Deposition methods of choice include vapour deposition techniques Bhat et al, 2003), sputtering Bauer et al, 2003), pulsed laser deposition (Krebs et al, 2003) and solution casting (Park & Xia, 1999;Su, 2004;Narayanan et al, 2004). All these methods aim to produce a large and homogeneous surface area.…”

Breath Figures as a Dynamic Templating Method for Polymers and Nanomaterials

“…Korgel and co-workers and Chen and co-workers have investigated the BF formation of dodecanethiol or perfluoro-thiol (29) stabilized gold nanoparticles (5 nm) cast from Freon-type solvents or CS 2 . [54,55] from chloroform was explored as well. Hexagonal bubble arrays with bubble dimensions from 350 nm to 5 lm formed upon evaporation in a humid environment.…”

“…When such gold hexagonal arrays were pyrolyzed at 400°C, the organic ligand was burnt off and gold-honeycomb arrays were obtained. [55] REVIEW www.advmat.de The formation of BFs is not limited to gold nanoparticles. Heptacosafluoro-pentadecane-1-thiol stabilized silver nanoparticles (2 nm) form highly ordered bubble arrays when cast from HCFC-225, a Freon derivative, under humid conditions.…”

Generation and Characterization of Multilayer Systems Consisting of Au55(PPh3)12Cl6 Double Layers and SiO2 Barrier Films

“…Absolutely dry solvents cause the Bénard-Marangoni effect. [13][14][15][16][17][18] This effect deals with the evaporation of thin liquid films Figure 5. AFM images of a silicon wafer surface (top), a cluster double layer generated by spin coating (left) and a SiO 2 film on top of the cluster film (right), indicating that the SiO 2 does not destroy the cluster layer.…”