Fig. 3

FESEM images (a, b) and particle size distribution histograms (c, d) of iron oxide nanoparticles (magnetite and hematite) synthesized using Guava leaf extract and calcined at 300 °C (Gv3) and 600 °C (Gv6).

FESEM images (a, b) and particle size distribution histograms (c, d) of iron oxide nanoparticles (magnetite and hematite) synthesized using Guava leaf extract and calcined at 300 °C (Gv3) and 600 °C (Gv6).