SEM pictures of GZO particles prepared hydrothermally from the solution of zinc nitrate and gallium nitrate with different Ga/Zn molar ratios: 0 mol% (a), 0.5 mol% the inset is TEM picture of the powder (b), 1 mol% (c) and 2 mol% (d). All samples were dried at 100 C
The specific surface area (BET) of the GZO powder as a function of Ga doping ratio is shown in Fig. 2. BET of the
powder increases gradually by increasing the doping ratio from 4.5 m2/g for pure ZnO up to 8.4 m2/g for 2 mol%
doping ratio. The increase in the surface area reflects the decrease in crystallite size which is consistent with results
obtained from XRD and SEM (Fig. 3).