金和金銀合金奈米棒在界面活性劑溶液中形態的調控

The Morphology Control of Au and Au-Ag nanorods in Surfactant Solution

謝維哲(Wei-Chi Hsieh)

指導教授 ： 鄧金培

淡江大學/理學院/化學學系碩士班/碩士(2010年)

https://doi.org/10.6846/TKU.2010.00066

摘要

在溴化十六烷基三甲基銨（CTAB）中，利用晶種成長法製備金奈米棒，之後將金奈米棒轉到十二烷基硫酸納（SDS）中，並加入維生素C和銷酸銀使銀離子還原至金奈米棒表面上，而核殼型金/銀奈米棒的表面電漿共振吸收會藍位移，若加入強還原劑硼氫化鈉，核殼型金/銀奈米棒的銀殼會被還原，則表面電漿共振吸收會紅位移。
　　在CTAB的金奈米棒中，加入四氯金酸及左旋維生素C，會使金奈米棒的形態轉變成啞鈴形。進一步轉至SDS中，發現溶液顏色由桃紅色變成墨綠色，吸收光譜發生藍位移，最後金奈米棒的長寬比變小。此外，在系統轉移的過程中，加入少量的硝酸銀，能夠穩定啞鈴形金奈米棒。
　　利用四氯金酸及左旋維生素C進行氧化還原反應，並探討不同帶電性CTAB和SDS，對核殼型金/銀奈米棒構形的影響。實驗結果顯示，CTAB的核殼型金/銀奈米棒的形態轉變成箭頭形，而SDS的核殼型金/銀奈米棒並沒有特定形狀。

關鍵字

金奈米棒 ； 銀 ； 溴化十六烷基三甲基銨 ； 十二烷基硫酸納

並列摘要

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.

並列關鍵字

gold nanorod ； silver ； CTAB ； SDS

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