Transmission Electron Microscopy
The size and morphological characterization of the silver nanoparticles were carried out using a Hitachi H 7650 transmission electron microscope (TEM) operating at 200 kV. TEM samples were prepared by dispersing nanoparticles in acetone for 30 min by ultrasonic vibration. The aqueous dispersion was dropped on a carbon coated copper TEM grid with filter paper underneath to absorb the acetone and dried in vacuum.