Impacts that pH and metal ion concentration have on the synthesis of bimetallic and trimetallic nanorods from gold seedst

Zusing Yang, Yang Wei Lin, Wei Lung Tseng, Huan Tsung Chang

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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.

Original languageEnglish
Pages (from-to)2450-2454
Number of pages5
JournalJournal of Materials Chemistry
Volume15
Issue number25
DOIs
Publication statusPublished - 2005 Jul 7

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

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