甘胺酸溶液中金銀汞三金屬奈米棒子的合成與鑑定

Synthesis and identification of differently shaped Au-Ag-Hg trimetallic nanorods in the glycine solution

黃冠銘(Kuan-Ming Huang)

指導教授 ： 張煥宗

國立臺灣大學/理學院/化學研究所/碩士(2005年)

https://doi.org/10.6342/NTU.2005.02752

摘要

本論文首先在水相中合成出ㄧ維的奈米金棒子，之後將合成出來的奈米金棒子溶液在甘胺酸緩衝液的調控下變化其pH值，並在此過程中加入汞金屬離子（Hg2+），發現在高pH值下銀和汞金屬離子將會沈積在奈米金棒子，而形成三金屬奈米棒子。除此之外，我們在反應過程中加入照光的條件，發現在pH為9.0的條件中所形成的金銀汞三金屬奈米棒子形成部分的自我排列的現象。隨著反應時間的變化，原始金棒子的長度有先增加再減少（52 nm→59 nm→54 nm）的趨勢，而寬度則逐漸增加（16 nm→23 nm）。其形狀也由較長的棒子（R~3.25）形狀變成啞鈴型再變成長寬比較小（R~2.35）的棒子。我們由一些實驗結果推估此排列現象主要可能是因為界面活性劑在奈米棒子表面藉由疏水作用力形成雙層的排列，並加上照光和溶液中甘胺酸等其他作用，因而造成金銀汞三金屬奈米棒子能夠形成排列。另外，當汞金屬離子沈積於奈米金棒子上的量不同時，吸收光譜和顏色將會有明顯的不同，因此我們也可對此進ㄧ步的研究，將來可應用於
檢測汞金屬的感測器。

關鍵字

三金屬奈米棒子 ； 金銀汞 ； 甘胺酸

並列摘要

This thesis describes the preparation of high-quality Au–Ag–Hg trimetallic nanorods (NRs) from Au seeds in the presence of silver ions, mercury ions, ascorbic acids and cetyltrimethylammonium bromide (CTAB) in glycine solutions (pH > 8.5) under illumination at the wavelength greater than 500 nm using a 500-W mercury lamp by using a seed–growth method. Formation of Au–Ag–Hg trimetallic NRs by reduction and deposition of silver and mercury ions on the gold NRs was investigated by conducing UV-Vis absorption and TEM measurements and was confirmed by performing inductively coupled plasma-mass spectrometry and energy dispersive X-ray measurements. Control of the pH and the concentration of the mercury ions allows preparation of differently colored, sized and shaped Au–Ag–Hg trimetallic NRs. With increasing the reaction time from 0 to 60 min, the NRs changed from rod to dumbbell shapes, with decreasing aspect ratios. We have also found that illumination and CTAB is essential for partially self-assembly aggregation of the Au–Ag–Hg trimetallic NRs at pH 9.5. The average distance of 5.2 nm between any two adjacent Au–Ag–Hg trimetallic NRs suggests that the assembly is mainly due to the formation of CTAB bilayers between the Au–Ag–Hg trimetallic NRs.

並列關鍵字

trimetallic nano rod ； Au/Ag/Hg ； Glycine

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