Temperature-dependent tuning of band gap of Fe3O4 nanoparticles for optoelectronic applications


We have investigated structural, morphological and temperature dependent absorption characteristics of Fe3O4 nanoparticles. X-ray diffraction pattern exhibited six diffraction peaks belonging to the cubic phase structure with lattice parameter of a = 8.1602 Å. Spectral variation of absorption coefficient were utilized to achieve Tauc and spectral derivative analyses providing the band gap of the Fe3O4 at varying temperature. The band gap of Fe3O4 nanoparticles was found around 2.08 eV at 300 K and around 2.14 eV at 10 K. The band gap variation with applied temperatures between 10 and 300 K were also investigated using Varshni relation.


Published by Chemical Physics Letters;; S. Delice, Department of Physics, Hitit University, 19040 Çorum, Turkey; M. Isik, Department of Electrical and Electronics Engineering, Atilim University, 06836 Ankara, Turkey; N.M. Gasanly, Department of Physics, Middle East Technical University, 06800, Ankara, Turkey, Virtual International Scientific Research Centre, Baku State University, 1148 Baku, Azerbaijan.


Oxides, Fe3O4, nanoparticles, optical properties