Di-2-ethylhexyl dithiophosphoric acid surface protected gold nanoparticles: micellar synthesis, stabilization, isolation, and propertiesReport as inadecuate




Di-2-ethylhexyl dithiophosphoric acid surface protected gold nanoparticles: micellar synthesis, stabilization, isolation, and properties - Download this document for free, or read online. Document in PDF available to download.

Gold Bulletin

, Volume 44, Issue 4, pp 207–215

First Online: 06 October 2011

Abstract

Gold nanoparticles AuNPs were synthesized in the organic solution by means of the reduction of HAuCl4 by hydrazine in reverse micelles of oxyethylated surfactant Triton N-42, with decane as the dispersion medium. To isolate the powder of particles, the micelles were destroyed with chloroform in the presence of di-2-ethylhexyl dithiophosphoric acid as a surface protecting agent. According to the results of several experiments, the yield is within the limits of 90–98%, calculated for gold. The obtained preparations are dark blue hydrophobic powders containing aggregated but not agglomerated gold nanoparticles, as well as microcrystals ∼0.08–0.2 μm of NaCl. The powders get re-dispersed in weakly polar organic solvents with the formation of colloidal solutions. The shape of the nanoparticles is spherical. Their nuclei are gold single crystals with a narrow size distribution; their diameter dAu is about two times as large as the diameter of the aqueous nucleus dc of initial micelles: dAu = 7.7 ± 1.4 nm dc = 3.6 nm and 8.8 ± 1.5 nm 4.6 nm. The preparations were studied by means of dynamic light scattering, atomic force microscopy, transmission electron microscopy, UV–vis spectroscopy, IR spectroscopy, X-ray powder diffraction, and thermogravimetric and elemental analyses. In the case of the particles with dAu = 8.8 nm, the product is a mixture of AuNPs and the salt with the molar ratio Au-NaCl ≈ 1:4.54, while the gross composition of AuNPs per one gold atom is estimated as AuC16H34O2PS2Na∙2N2H40.16 with the number of gold atoms in one particle ∼21,000.

KeywordsGold nanoparticles Reverse micelles Triton N-42 surfactant Di-2-ethylhexyl dithiophosphoric acid  Download fulltext PDF



Author: Vladimir V. Tatarchuk - Anastasiya P. Sergievskaya - Alexander I. Bulavchenko - Vladimir I. Zaikovsky - Irina A. Druzhin

Source: https://link.springer.com/







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