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viviwei503

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The Importance of the CTAB Surfactant on the Colloidal Seed-Mediated Synthesis of Gold Nanorods

Langmuir, 2008, 24 (3), pp 644¨C649

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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