One-Step Synthesis of Ordered Two-Dimensional Assemblies of Silver Nanoparticles by the Spontaneous Reduction of Silver Ions by Pentadecylphenol Langmuir Monolayers

摘要

The single-step synthesis of silver nanoparticles by the reduction of silver ions present in the subphase under alkaline conditions by 3-pentadecylphenol (3-PDP) Langmuir monolayer and their assembly into ordered two-dimensional structures is described.The reduction of the silver ions occurs by electron transfer from ionized phenol groups of 3-PDP,which then stabilize the particles against aggregation.Similar reduction of aqueous silver ions was carried out at the interface with toluene bearing 3-PDP and yielded monodisperse silver nanoparticles that may be separated as a dry powder and redispersed in a range of organic solvents.The mechanism of reduction of silver ions by 3-PDP under alkaline conditions was studied by UV-visible spectroscopy,Fourier transform infrared spectroscopy (FTIR),nuclear magnetic resonance (NMR) spectroscopy,transmission electron microscopy (TEM),and chemical analysis by X-ray photoelectron spectroscopy (XPS),and is discussed in detail.