Studies on structural, morphological, magnetic and optical properties of chromium sesquioxide (Cr_2O_3) nanoparticles: Synthesized via facile solvothermal process by different solvents

摘要

Chromium sesquioxide (Cr_2O_3) nanoparticles have been successfully synthesized via the facile solvothermal process, by using CrO_3 in different solvents. The as-synthesized nanoparticle sizes are calculated and confirmed to be 25-45 nm, by using X-ray diffraction (XRD) and transmission electron microscopy (TEM). The functional groups of the samples were tested by the Fourier transform infrared (FTIR) spectroscopy. Fine and spherical-like morphologies and compositional elements of the products were observed by the scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) spectroscopy. A weak ferromagnetic (WFM) property was observed for sample by the vibrating sample magnetometer (VSM). The observed band gap values (E_g=4.33-3.54 eV) higher than that of bulk Cr_2O_3 (~3.4 eV) indicated that the particles had been successfully synthesized in the nano region, and measured by ultra-violet visible (UV-vis) absorption spectroscopy. The broad visible emission at ~399 nm, in the photoluminescence spectroscopy revealed the high purity and perfect crystallinity of the samples.