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Crystal Growth of Thiol-Stabilized Gold Nanoparticles by Heat-Induced Coalescence

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Author(s): Moon SookYoung | Tanaka Shun-ichiro | Sekino Tohru

Journal: Nanoscale Research Letters
ISSN 1931-7573

Volume: 5;
Issue: 5;
Start page: 813;
Date: 2010;
Original page

Keywords: Au | Nanoparticle | Polygon | Coalescence | Dodecanethiol | Surface stabilization | Self-organization

ABSTRACT
Abstract A monolayer of dodecanethiol-stabilized gold nanoparticles changed into two-dimensional and three-dimensional self-organized structures by annealing at 323 K. Subsequent crystal growth of gold nanoparticles occurred. Thiol molecules, although chemisorbed, form relatively unstable bonds with the gold surface; a few thiols desorbed from the surface and oxidized to disulfides at 323 K, because the interaction energy between thiol macromolecules is larger than that between a thiol and a nanoparticle. The gold nanoparticles approached each other and grew into large single or twinned crystals because of the van der Waals attraction and the heat generated by the exothermic formation of disulfides.

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