High-yield synthesis of tetrahedral-like gold nanotripods using an aqueous binary mixture of cetyltrimethylammonium bromide and hexamethylenetetramine

Ali Umar Akrajas, Munetaka Oyama

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45 Citations (Scopus)

Abstract

We present an effective strategy to grow the uncommon highly anisotropic shape of tribranched gold nanoparticles (nanotripods) via the reduction of tetrachloroaurate ions (AuCl4 -) in an aqueous mixture of cetyltrimethylammonium bromide (CTAB) and hexamethylenetetramine (HMT) at room temperature. By simply optimizing the concentrations of HAuCl4, NaOH, CTAB, and HMT, gold nanotripods with a dominant Y-shape tetrahedral-like morphology could be obtained in high yield (∼80%). While the in-plane growth to form gold nanotripods or branched gold nanocrystals with tips has been reported up to now, the present result exhibited three-dimensional nanostructural growth to form the tetrahedral-like shape of gold nanocrystals. The surface plasmon absorption of the formed gold nanotripods showed a strong peak around 670-800 nm depending on the size of nanotripods. The formation and transformation processes of gold nanotripods are discussed on the basis of the changes in absorption spectra.

Original languageEnglish
Pages (from-to)1146-1152
Number of pages7
JournalCrystal Growth and Design
Volume9
Issue number2
Publication statusPublished - Feb 2009

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Methenamine
hexamethylenetetramine
Binary mixtures
Gold
binary mixtures
bromides
gold
synthesis
Nanocrystals
nanocrystals
cetrimonium
Absorption spectra
Ions
Nanoparticles
absorption spectra
nanoparticles
room temperature

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

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abstract = "We present an effective strategy to grow the uncommon highly anisotropic shape of tribranched gold nanoparticles (nanotripods) via the reduction of tetrachloroaurate ions (AuCl4 -) in an aqueous mixture of cetyltrimethylammonium bromide (CTAB) and hexamethylenetetramine (HMT) at room temperature. By simply optimizing the concentrations of HAuCl4, NaOH, CTAB, and HMT, gold nanotripods with a dominant Y-shape tetrahedral-like morphology could be obtained in high yield (∼80{\%}). While the in-plane growth to form gold nanotripods or branched gold nanocrystals with tips has been reported up to now, the present result exhibited three-dimensional nanostructural growth to form the tetrahedral-like shape of gold nanocrystals. The surface plasmon absorption of the formed gold nanotripods showed a strong peak around 670-800 nm depending on the size of nanotripods. The formation and transformation processes of gold nanotripods are discussed on the basis of the changes in absorption spectra.",
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N2 - We present an effective strategy to grow the uncommon highly anisotropic shape of tribranched gold nanoparticles (nanotripods) via the reduction of tetrachloroaurate ions (AuCl4 -) in an aqueous mixture of cetyltrimethylammonium bromide (CTAB) and hexamethylenetetramine (HMT) at room temperature. By simply optimizing the concentrations of HAuCl4, NaOH, CTAB, and HMT, gold nanotripods with a dominant Y-shape tetrahedral-like morphology could be obtained in high yield (∼80%). While the in-plane growth to form gold nanotripods or branched gold nanocrystals with tips has been reported up to now, the present result exhibited three-dimensional nanostructural growth to form the tetrahedral-like shape of gold nanocrystals. The surface plasmon absorption of the formed gold nanotripods showed a strong peak around 670-800 nm depending on the size of nanotripods. The formation and transformation processes of gold nanotripods are discussed on the basis of the changes in absorption spectra.

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