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.
Highlights
Self-organization of nanocrystals has been reported during the past decade
Despite the large volume of literature relating to synthesis, morphological development, assembling, and demonstrated applications of thiol-stabilized gold (Au) nanoparticles, only a few studies exist on further structural development such as low-temperature coalescence and grain growth based on self-organized structures
We have devised a method for growing selforganized gold nanoparticles at relatively low temperature (323 K)
Summary
Self-organization of nanocrystals has been reported during the past decade. The first two-dimensional (2D) and threedimensional (3D) superlattices were observed with Ag2S and CdSe nanocrystals, respectively [1,2,3,4]. Abstract A monolayer of dodecanethiol-stabilized gold nanoparticles changed into two-dimensional and threedimensional self-organized structures by annealing at 323 K. Despite the large volume of literature relating to synthesis, morphological development, assembling, and demonstrated applications of thiol-stabilized gold (Au) nanoparticles, only a few studies exist on further structural development such as low-temperature coalescence and grain growth based on self-organized structures.
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