| Summary: | 碩士 === 淡江大學 === 化學學系碩士班 === 97 === The purpose of this essay is to discuss the morphology control of the gold nanorods in ionic surfactant solutions. At first, gold nanorods were prepared by chemical reduction in the aqueous micellar solution of hexadecyltrimethylammonium bromide (CTAB). Their shapes and aspect ratios could be further tuned by the subsequent oxidation and reduction. For both HAuCl4 and ascorbic acid reactants, the resulting gold nanorods exhibit the shape of the dumbbells. In particular, the shift of the surface plasmon resonance band of gold nanorod dumbbells in UV-VIS spectra could be inversed by the addition of the reactants in reversed order. At the same time, those changes also strongly depend on both the charge of the surfactant used in the reaction such as CTAB and sodium dodecyl sulfate (SDS). On the other hand, other reductants (NaBH4 and sodium citrate) and organic additives (pyrene) were employed to examine their influences on the dispersity of the resulting gold nanorods. According to the experimental results, it is suggested that the high dispersity of the gold nanorod dumbbells could be obtained by the gold complex binding to the surface charge of the surfactant such as the AuCl4- and CTAB system.
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