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Influence of thermal annealing on the structural and optical properties of maghemite (γ‐Fe 2 O 3 ) nanoparticle thin films
Author(s) -
Parsianpour Ehsan,
Gholami Mohammad,
Shahbazi Nima,
Samavat Feridoun
Publication year - 2015
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.5754
Subject(s) - maghemite , annealing (glass) , diffractometer , materials science , fourier transform infrared spectroscopy , nanoparticle , band gap , thin film , analytical chemistry (journal) , spectroscopy , chemical engineering , nanotechnology , chemistry , scanning electron microscope , optoelectronics , metallurgy , composite material , organic chemistry , physics , quantum mechanics , engineering
In this study, maghemite ( γ ‐Fe 2 O 3 ) nanoparticles were initially synthesized via chemical co‐precipitation and then deposited by spray pyrolysis as thin films on white glass substrates. The thin films were annealed for 8 h at 400, 450, 500, 550, and 600 °C in an oven. The structural studies of maghemite nanoparticles were carried out using X‐ray diffractometer. Structural properties that we investigated by X‐ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, SEM, and Energy dispersive X‐ray analysis (EDS). Optical properties of the samples were also investigated by ultraviolet‐visible (UV–vis) spectroscopy. The results showed that maghemite nanoparticles have crystalline structure with domain that increases in size with increasing annealing temperature. The optical band gap values were found to reduce from 2.9 to 2.4 eV with increase in annealing temperature. Copyright © 2015 John Wiley & Sons, Ltd.