Formation of Ordered Arrays of Gold Nanoparticles from CTAB Reverse Micelles |
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| Authors: | LIN Jun ZHOU Wei-Lie O'CONNOR Charles-J |
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| Institution: | 1. Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 159 Renmin Street, Changchun 130022, China;
2. Advanced Materials Research Institute, College of Science, University of New Orleans, New Orleans, LA 70148, USA |
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| Abstract: | In this presentation, a reverse micelle technique was described to create colloid gold nanoparticles and their self-organization into superstructures. Gold nanoparticles were prepared by the reduction of HAuCl4 in CTAB/octane+1-butanol/H2O reverse micelle system using NaBH4 as reducing agent. Dodecanethiol (C12H25SH) was used to passivate the gold nanoparticles immediately after formation of the gold colloid. After re-dispersing in toluene under ultrasonication, a supernatant containing nearly monodispersed dodecanethiol-capped gold nanoparticles was obtained. Self-organization of the gold nanoparticles into ID, 2D and 3D superstructures was observed on the carbon-coated copper grid by TEM. A representative TEM mirograph of the 2D array is shown in Fig. 1. UV/Vis absorption spectra were also used to characterize the gold colloids with and without dodecanethiol capping. |
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