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Langmuir. 2008 Feb 5;24(3):644-9. doi: 10.1021/la703625a. Epub 2008 Jan 10.

The importance of the CTAB surfactant on the colloidal seed-mediated synthesis of gold nanorods.

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  • 1Department of Chemical Engineering, Texas Materials Institute, Center for Nano and Molecular Science and Technology, The University of Texas at Austin, Austin, Texas 78712-1062, USA.


Gold nanorods were synthesized by the colloidal seed-mediated, surfactant-assisted approach [Gou et al., Chem. Mater. 2005, 17, 3668-3672] using CTAB (hexadecylcetyltrimethylammonium bromide) obtained from ten different suppliers. The yield of gold nanorods depended strongly on the CTAB used: with the same recipe, three of the CTABs did not yield nanorods and produced only spherical gold particles, whereas the other CTABs yielded nanorods with nearly 100% yield. These results suggest that an impurity in the CTAB is very important for nanorod formation.

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