Transmission electron microscopy (TEM) was performed on a transmission electron microscope (Model JEM-2100, Hitachi) and the particle sizes from TEM were estimated with the graphic software (Photoshop 7.0).
Transmission electron microscopy (TEM) wasperformed on a transmission electron microscope (Model JEM-2100, Hitachi) and the particlesizes from TEM were estimated with the graphic software (Photoshop 7.0).