Self-Assembly of Ag₂S Colloidal Nanoparticles Stabilized by MPS in Water Solution

Abstract

Self-assembly of colloidal Ag 2 S nanoparticles (NPs) was studied in the presence of (3-mercaptopropyl)trimethoxysilane (MPS). Solutions with different molar ratios of Ag 2 S/MPS were prepared. The appearance of nano- and microtubes was detected. Self-organized NPs were studied with optical microscopy, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and high-resolution transmission electron microscopy (HRTEM). Silicon nuclear magnetic resonance spectroscopy ( 29 Si NMR) was used to study polycondensation of MPS molecules. Geometrical parameters of the nano- and microtubes depended on the molar ratio of Ag 2 S/MPS. The scheme and mechanism of self-assembly of Ag 2 S NPs in nanotubes in the presence of MPS were proposed. The effect of MPS on the preservation of the initial stoichiometry of Ag 2 S NPs was discussed.

Synthesis and Characterization of Carbon Aerogels Electrodes Modified by Ag2S Nanoparticles

“…Currently, different synthesis methodologies have been reported for this compound including, sol-gel, micro-emulsion, microwave, wet chemistry, organic metallic precursors, sputtering, and solid-vapor reactions. Some of the main challenges during the synthesis process are obtaining a narrow particle size distribution and good dispersion 20,[26][27][28][29][30] . In this work, electrodes based on carbon aerogel and Ag 2 S NPs were synthesized by a simple methodology using sputtering and solid-vapor reactions 31 .…”