Synthesis and identification of differently shaped Au-Ag-Hg trimetallic nanorods in the glycine solution
Date Issued
2005
Date
2005
Author(s)
Huang, Kuan-Ming
DOI
zh-TW
Abstract
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.
Subjects
三金屬奈米棒子
金銀汞
甘胺酸
trimetallic nano rod
Au/Ag/Hg
Glycine
Type
thesis
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