Self-assembly of water-dispersed gold nanoparticles stabilized by a thiolated glycol derivative
Source: Journal of Nanoparticle Research, Volume 7, Number 2, June 2005 , pp. 187-193(7)
Abstract:Two-dimensional (2D) hexagonally close-packed arrays of water-dispersed gold nanoparticles (NPs) on highly hydrophilic sputter-deposited SiO2 surfaces were fabricated via an evaporation-induced self-assembly process. Using a non-ionic amphiphilic glycol derivative with the thiol head group, 1-mercapto-3,6,9-trioxodecane, as a stabilization ligand, high-concentration Au NPs were stably dispersed in water, and self-assembled into m-sized well-ordered 2D arrays on SiO2 surfaces during the solvent evaporation on SiO2 surfaces. Due to the non-ionic character of the ligand, the particleparticle interactions may only depend on the capillary and van der Waals forces, and not on the electric double-layer forces that change with ion/electrolyte concentrations during the solvent evaporation. This study provides an approach to fabrication of close-packed 2D arrays of water-dispersed NPs instead of using toxicological organic solvent or complex water-organic phase transfer process. Meanwhile, this approach will make it easier to study their self-assembly mechanisms in a variety of solvents by simplifying ambiguous particleparticle interactions.
Document Type: Research article
Affiliations: 1: Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo , 113-8656, Japan, 2: Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo , 113-8656, Japan, Email: firstname.lastname@example.org
Publication date: 2005-06-01