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A Mechanism for the Self-Organization of Colloidal Gold Nanoparticles |
| ZHANG Yong-Jun1,2;HAN Guan-Qi1;LI Wei1;DAI Min1;ZHANG Yu1;HUANG Xin-Fan1;CHEN Kun-Ji1 |
| 1State Key Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093
2Institute of Solid State Physics, Jilin Normal University, Siping 136000 |
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| Cite this article: |
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ZHANG Yong-Jun, HAN Guan-Qi, LI Wei et al 2004 Chin. Phys. Lett. 21 2486-2488 |
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Abstract We report a two-stage mechanism of formation of the two-dimensional surperlattices in colloidal gold nanoparticles. The first stage is the formation and growth of holes. When the film is thinner than the "pancake" thickness and because the solvent volatility holes nucleate and grow, the dry solid surface is exposed. The second stage corresponds to the reorganization of the colloids in the impacted areas between several holes, in which the particles gathering along the rims order due to the van der Waals-type attraction between colloids and the confinement by the length of dodecanethiol. Then at a compromised distance and perfect position giving the minimum free energy, ordering occurs in small domains along the boundary of the hole. When the ordered domains become closer because of the hole growth, they rotate at certain angles and the further ordering appears.
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| Keywords:
61.46.+w
81.16.Dn
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Published: 01 December 2004
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