| Summary: | 碩士 === 淡江大學 === 化學學系碩士班 === 98 === Gold nanorods were prepared by seed-mediated growth method in the aqueous solution of hexadecyltrimethylammonium bromide（CTAB）. They were subsequently transferred into the solution of sodium dodecyl sulfate（SDS）. And Ag+ was reduced on the surface of gold nanorods by ascorbic acid. The surface plasmon resonance band of gold-silver nanorods in UV-VIS spectra was blue-shifted. When gold-silver nanorods with the silver shell were further reduced by NaBH4, and the red shift in the surface plasmon resonance band was observed.
Gold nanorods with the dumbbell shape were obtained by addition of HAuCl4 and ascorbic acid in CTAB. Their absorption spectra have the blue shift and their color was changed from pink to jasper when they were transferred into the solution of SDS. Finally, gold nanorods exhibited the lower aspect ratio. On the other hand, dumbbell-shaped gold nanorods could be stabilized in the transfer process by adding AgNO3.
The difference in the morphology change of gold-silver nanorods by the redox reaction of ascorbic acid and HAuCl4 was further investigated in the differently charged surfactants such as CTAB and SDS. The experimental results show that gold-silver nanorods with the arrow-headed shape could be obtained in CTAB, but the irregular shape of gold-silver nanorods appeared in SDS.
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