Ag/SiOx nanocomposite powders synthesized from colloids obtained by pulsed laser ablation

Autor: Valery A. Svetlichnyi, Ivan N. Lapin, Darya O. Martynova, Anastasiia V. Shabalina, T. I. Izaak, Tamara Kharlamova
Rok vydání: 2018
Předmět:
Zdroj: Colloids and surfaces A: physicochemical and engineering aspects. 2018. Vol. 553. P. 80-88
ISSN: 0927-7757
Popis: Ag/SiOx nanopowders were obtained from Ag and Si/SiO2 colloids synthesized via pulsed laser ablation in water. The resulting composite powder was annealed at different temperatures in the region of 100–900 °C. The composition and structure of the obtained materials were studied. The interaction between silica and silver species taking place during composite formation was investigated. A stabilization of Ag nanoparticles in mixed colloids due to their interaction with soluble silicon oxide compounds was found. It was also revealed that the contact between silver and Si/SiO2 particles resulted in the decrease of the temperature at which the formation of additional oxygen-deficient centres occurs in the silica structure. New types of defects, namely 3-membered cycles and non-bridging oxygen groups, appeared as a result of Ag and Si/SiO2 surface interaction at 700 °C. Thus, silver nanoparticles facilitated the formation of defects in the structure of SiO2.
Databáze: OpenAIRE