Impacts that pH and metal ion concentration have on the synthesis of bimetallic and trimetallic nanorods from gold seedst
Resource
Journal of Materials Chemistry 15: 2450-2454
Journal
Journal of Materials Chemistry
Journal Volume
15
Journal Issue
25
Pages
2450-2454
Date Issued
2005
Author(s)
Abstract
This paper describes the synthesis of Au–Ag bimetallic and Au–Ag–Hg trimetallic nanorods (NRs) from gold NRs, which acted as seeds, under alkaline conditions (pH ≥ 8.0) and in the presence of hexadecyltrimethylammonium bromide (CTAB), ascorbic acid, and other metal ions. The Hg2+, Fe3+, and Co2+ ions are stable at pH ≥ 8.5 in the presence of 200 mM glycine; these conditions allow investigations into their roles during the syntheses of the NRs. We prepared a number of differently colored NRs by controlling the pH and the nature and concentration of the metal ion. Mercury ions, which have a higher reduction potential and form a more stable complex with glycine, are reduced and deposited on the gold NRs to form Au–Ag–Hg trimetallic NRs; we confirmed this situation by performing inductively coupled plasma-mass spectrometry and energy dispersive X-ray measurements. In addition, we have demonstrated that the size and shape of the Au–Ag–Hg trimetallic NRs can be tuned by controlling the Hg2+ concentration.
Type
journal article
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