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High Yield Synthesis of Pure Alkanethiolate-Capped Silver Nanoparticles

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journal contribution
posted on 05.10.2010 by Alessandra Mari, Patrizia Imperatori, Giada Marchegiani, Luciano Pilloni, Alessio Mezzi, Saulius Kaciulis, Carla Cannas, Carlo Meneghini, Settimio Mobilio, Lorenza Suber
One-phase, one-pot synthesis of Ag0 nanoparticles capped with alkanethiolate molecules has been optimized to easily achieve a pure product in quantitative yield. We report the synthesis of dodecanethiolate-capped silver particles and the chemophysical, structural, and morphologic characterization performed by way of UV−vis, 1H NMR, and X-ray photoelectron (XPS) spectroscopies, X-ray powder diffraction (XRD) and X-ray absorption fine structure analysis (XFAS), electron diffraction and high-resolution transmission electron microscopy (HR-TEM), and scanning and transmission electron microscopy (SEM and TEM). Depending on the molar ratio of the reagents (dodecylthiosulphate/Ag+), the mean Ag0 particle size DXRD is tuned from 4 to 3 nm with a narrow size distribution. The particles are highly soluble, very stable in organic solvents (hexane, toluene, dichloromethane, etc.), and resistant to oxidation; the hexane solution after one year at room temperature does not show any precipitation or formation of oxidation byproducts.