Silver oxide particles/silver nanoparticles interconversion: susceptibility of forward/backward reactions to the chemical environment at room temperature

OSCAR A. DOUGLAS GALLARDO; RAQUEL MOIRAGHI; MICAELA A. MACCHIONE; JORGE A. GODOY; MANUEL A. PÉREZ; EDUARDO A. CORONADO; VICENTE A. MACAGNO

RSC Advances

The Royal Society of Chemistry

Lugar: Cambridge; Año: 2012 vol. 2 p. 2923 - 2923

2046-2069

he thermal stability of the silver oxide particles (Ag2O)/metallic silver nanoparticles (AgNPs) systemin aqueous and gaseous environments is investigated with UV-Visible spectroscopy, TEM, SEM andDLS as characterisation techniques, and with calculations using electromagnetic theory. Thermaldecomposition of aqueous Ag2O colloids to produce AgNPs is conclusively demonstrated and used asa base reaction to produce clean AgNPs without any external reducing agent. Such a spontaneouscharacter of Ag2O decomposition in alkaline aqueous/water-enriched environments at roomtemperature makes the formation of silver oxide films on silver nanoparticles/nanostructures unlikely, keeping the silver surface oxide-free, a crucial feature in determining the silver catalytic and Raman enhancing properties. The synthetic suitability of this reaction to develop new routes to produce AgNPs is explored by analyzing the effect of temperature, complexing agents, and environmen