Synthesis of Silver Nanoparticles by Hydrothermal Processing

Abstract

Hydrothermal water treatments of silver acetate (CH3COOAg) were investigated to reveal the factors controlling the formation of silver nanoparticles (AgNPs) with uniform size distribution. The effects of reaction time and concentration of silver acetate solution on the synthesis of Ag nanoparticles were studied, and the fabricated products were characterized. The hydrothermal water treatments of CH3COOAg were carried out between the temperatures of 250 - 450 °C in a batch reactor. In supercritical water regions, at 400 °C and a pressure of 31.5 MPa, silver particles are rapidly synthesized due to reaction rate increases at a low dielectric constant of supercritical water. The preparation of the silver particles with 30-80 nm in size showed a highly crystalline structure identified by XRD and TEM observations.

Supercritical hydrothermal synthesis of silver nanoparticles, composites, and their characterizations

“…The synthesis product was washed by distilled water and dried at 110 °C in a vacuum oven overnight. Hydrothermal synthesis of silver nanoparticles at supercritical water conditions was obtained in the following order: first, the hydrolysis of silver acetate salt occurred, then followed by the dehydration process, and finally, the transformation of silver oxide to metal silver as described in the literature [15]. Synthesis of the silver nanoparticles doped activated carbon nanocomposite (AC-Ag): Briefly, 3 ml of precursor solution (CH3COOAg) of appropriate concentrations and 0.06 g of activated carbon powders were mixed with a ratio of 12:1.…”

“…Due to the trace of the dispersed solvent, the particles were not seen clearly. X-ray diffractometer's analyses of AgNPs, which were synthesized at different temperatures (from 250 °C to 450 °C) were performed to study the temperature influence of hydrothermal conditions [15]. The reaction time was 30 min, and the heating rate was 12.67 °C/ min during the synthesis.…”