2.6.3. TEM, SEM and EDS

The structural morphology and AgNP sizes were studied by TEM and SEM observation using a Transmission Electron Microscopy (JEM-1230, JEOL, Akishima, Japan) and Scanning Electron Microscopy (TM-1000, Hitachi, Japan) according to the method of [12]. In short, the AgNPs powder was equipped with a copper-coated grid and a carbon-coated grid, respectively, for one day at room temperature to form a film of the sample. The existence of silver ion was confirmed by energy dispersive spectrum (EDS).
