Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai, 980-8577, Japan.
Nanoscale Res Lett. 2010 Mar 12;5(5):813-7. doi: 10.1007/s11671-010-9565-6.
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.
在 323K 退火时，十二硫醇稳定的金纳米粒子单层变成二维和三维自组装结构。随后发生金纳米粒子的晶体生长。虽然硫醇分子化学吸附在金表面上，但它们形成的键相对不稳定；在 323K 时，一些硫醇从表面解吸并氧化成双硫键，因为硫醇大分子之间的相互作用能大于硫醇与纳米粒子之间的相互作用能。由于范德华吸引力和形成双硫键的放热反应产生的热量，金纳米粒子相互接近并生长成大的单晶体或孪晶。
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