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  • Preparation of gold nanoparticles by surfactant-promoted reductive reaction without extra reducing agent.

Preparation of gold nanoparticles by surfactant-promoted reductive reaction without extra reducing agent.

Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy (2012-12-25)
Junqi Tang, Jiamin Huang, Shi-Qing Man
ABSTRACT

Cetyltrimethyl ammonium bromide (CTAB) has been extensively applied in the solution-phase synthesis of many types of colloidal nanoparticles. However, the uses of CTAB were mainly considered as template or capping agents to form controllable shape and protect the product from agglomeration. Here it was discovered that CATB could serve as a very mild reductant to reduce gold salt precursors preparing gold nanoparticles (GNPs) at base environment. CTAB acted as the reducing agent suffering a partial degradation and forming CTA macro radicals. FTIR proved the formation of CCl and/or CBr bond after CTAB degraded. The characterization of synthesized GNPs was examined by UV-Vis spectra, TEM and XRD. Several factors affecting the process of reaction, such as the amount of NaOH, the molar ratio of CTAB and HAuCl(4), the reaction temperature, the effect of light and oxygen, and stirring were discussed.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Cetyltrimethylammonium hydrogensulfate, 99%
Sigma-Aldrich
Hexadecyltrimethylammonium chloride, ≥98.0% (NT)
Sigma-Aldrich
Hexadecyltrimethylammonium hydroxide solution, ~25% in methanol (T)
Sigma-Aldrich
Cetyltrimethylammonium chloride solution, 25 wt. % in H2O
Sigma-Aldrich
Hexadecyltrimethylammonium hydroxide solution, 10 wt. % in H2O
Supelco
Hexadecyltrimethylammonium bromide, analytical standard
Supelco
Hexadecyltrimethylammonium bromide, suitable for ion pair chromatography, LiChropur
Sigma-Aldrich
Hexadecyltrimethylammonium bromide, BioUltra, for molecular biology, ≥99.0% (AT)
Supelco
Hexadecyltrimethylammonium bisulfate, suitable for ion pair chromatography, LiChropur, ≥99.0% (T)
Sigma-Aldrich
Hexadecyltrimethylammonium bromide, ≥98%
Sigma-Aldrich
Hexadecyltrimethylammonium bromide, BioXtra, ≥99%
Sigma-Aldrich
Hexadecyltrimethylammonium bromide, for molecular biology, ≥99%
Sigma-Aldrich
Hexadecyltrimethylammonium bromide, ≥96.0% (AT)