*3.2. TEM Analysis*

The surface morphology and particle size of Zn doped Fe2O<sup>3</sup> nanoparticles were examined by transmission electron microscopy (TEM) measurements. It can be clearly seen from Figure 3a that Fe2O<sup>3</sup> nanoparticles are almost spherical in shape. The estimated average particle size from TEM lies between 16 nm to 23 nm for pure, as well as Zn doped Fe2O<sup>3</sup> nanoparticles. The particle size increases up to 4% of Zn concentration and then decreases which is consistent with XRD measurements and the values are given in Table 1. Figure 3a shows agglomerated nanoparticles of Fe2O3. The agglomeration is found to be decreasing with Zn content in Fe2O<sup>3</sup> lattice (Figure 3b–d). Zn 6% 5.002 13.221 14 51.02 −8.54 16 *3.2. TEM Analysis*  The surface morphology and particle size of Zn doped Fe2O3 nanoparticles were examined by transmission electron microscopy (TEM) measurements. It can be clearly seen from Figure 3a that Fe2O3 nanoparticles are almost spherical in shape. The estimated average particle size from TEM lies between 16 nm to 23 nm for pure, as well as Zn doped Fe2O3 nanoparticles. The particle size increases up to 4% of Zn concentration and then decreases which is consistent with XRD measurements and the values are given in Table 1. Figure 3a shows agglomerated nanoparticles of Fe2O3. The

agglomeration is found to be decreasing with Zn content in Fe2O3 lattice (Figure 3b–d).

**Figure 3.** TEM images of (**a**) pure Fe2O<sup>3</sup> , (**b**) Zn 2%, (**c**) Zn 4% and (**d**) Zn 6% nanoparticles.
