Preparation and characterization of Cr2O3 nanoparticle prepared by chemical method

Chromium oxide (Cr2O3) nanoparticles were prepared by sol-gel method, by the reaction of chromium chloride and ammonium hydroxide as procurers. Nanopowders are annealing at different temperatures (100 °C, 200 °C, and 600 °C) for 120 min and confirmed the rhombohedral structure by X-ray diffractometry analysis of the metal oxide and lattice parameters a = b = 4.926 A and c = 13.517 A for annealing temperature 400°C. SEM (scanning electron microscopy) and AFM (Atomic force microscopy) have been utilized used to determine the morphology with average crystallize and found increase from 51.38 nm to 104.12 nm when annealing temperature from 200 °C to 600 °C. While the optical energy gap (Eg,) was calculated