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

Delice S., Isik M., HASANLI N.

Chemical Physics Letters, vol.840, 2024 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 840
  • Publication Date: 2024
  • Doi Number: 10.1016/j.cplett.2024.141139
  • Journal Name: Chemical Physics Letters
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Chemical Abstracts Core, Chimica, Compendex, INSPEC
  • Keywords: Fe3O4, Nanoparticles, Optical properties, Oxides
  • Middle East Technical University Affiliated: Yes

Abstract

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.