Self-assembly of water-dispersed gold nanoparticles stabilized by a thiolated glycol derivative

Authors: Hu, Minghui¹; Yamaguchi, Yukio¹; Okubo, Tatsuya²

Source: Journal of Nanoparticle Research, Volume 7, Number 2, June 2005 , pp. 187-193(7)

Publisher: Springer

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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 particle–particle 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 particle–particle interactions.

Keywords: gold; glycol; nanoparticles; water-dispersed; 2D arrays; self-assembly; colloids

Document Type: Research article

DOI: http://dx.doi.org/10.1007/s11051-004-4826-x

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: okubo@chemsys.t.u-tokyo.ac.jp

Publication date: 2005-06-01