Preparation of Silver Nanoparticles in Oxide Matrices Derived by the Sol-Gel Method

摘要

Consideration is given to the processes proceeding in the Ag~+-SiO_2 and Ag~+-SiO_2 systems at a high silver content upon theri heat treatment in air.These processes lead to the formation of silver-oxide nanocomposite films.It is revealed that the formation of silver nanoparticles is due to thermally stiulated interaction between silver ions and the oxide matrix with the formation of solver silicate(germanate),which,at temperatures above 600 deg C,undergoes decomposition into silver nanoparticles and silicon(germanium)dioxide.It is demonstrate that,under the given conditions,silver particles are encapsulated into oxide particles,which prevents their further oxidation up to 900 deg C.