Anti-fungal activity of SiO2/Ag2S nanocomposites against Aspergillus niger.

Submicron particles of amorphous SiO(2) have been used to grow Ag(2)S nanophases at their surfaces. SEM and TEM analysis showed morphological well-defined nanocomposite particles consisting of Ag(2)S nanocrystals dispersed over the silica surfaces. These SiO(2)/Ag(2)S nanocomposites were investigated as anti-fungal agents against Aspergillus niger in different experimental conditions, including as nanofillers in cellulosic fibres. The anti-fungal activity in these composite systems is suggested to result from a synergistic effect due to Ag(2)S anti-fungal centres and the SiO(2) surfaces in promoting the adsorption of the fungus.