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Open Access Nano Express

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

SookYoung Moon12, Shun-ichiro Tanaka1 and Tohru Sekino1*

Author Affiliations

1 Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai, 980-8577, Japan

2 The Institute of Scientific and Industrial Research (ISIR), Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka, 567-0047, Japan

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Nanoscale Research Letters 2010, 5:813-817  doi:10.1007/s11671-010-9565-6

Published: 12 March 2010

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.

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