The effective of citrate as capping agent on the band gap of γ-Fe2O3 nanoparticles

Abstract

In this study, γ-Fe2O3 were synthesis by a chemical route at room temperature in the presence of a capping agent and without a capping agent. The capping agent used for covering Fe2O3 was tri-sodium citrate, the absorption spectra obtained by UV–Vis spectrophotometer in the wavelength range of 200 -800 nm. From this, it found that the optical band gap transitions of the γ-Fe2O3 nanoparticles in the absence of tri sodium citrate as 3.00 eV and with the present tri sodium citrate capped iron oxide as 2.28 eV. The sizes estimated utilizing observed band gaps data were in the range of 1.37 nm and 1.41 nm respectively the average sizes found to be increased as the band gap declined because of the quantum size effect