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Chemical solution method for fabrication of nanocrystalline iron(III) oxide thin films

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Abstract

A chemical solution technique for preparation of nanocrystalline iron(III) oxide thin films is developed. The deposition process is essentially based on the thermal decomposition of urea. The as-deposited and post-deposition heat-treated materials were characterized by X-ray analysis and Fourier transform infrared (FTIR) spectroscopy. Basic optical and electrical investigations were also performed. X-ray analysis confirmed that post-deposition heat-treated material is nontextured α-iron(III) oxide, with an average crystal size of 22 nm. The optical investigations show that the absorption of films (as-deposited and post-deposition treated) gradually decreases with an increase of the wavelength in the 390–820 nm region. The optical band gap for the as-deposited and post-deposition heat-treated films was determined to be 3.2 eV and 2.0 eV, respectively. The obtained α-Fe2O3 thin films exhibit a rather high resistivity at room temperature. However, our preliminary qualitative investigations have shown that the room temperature resistivity of α-Fe2O3 thin films is highly sensitive to moisture, indicating their potential applicability in moisture sensing systems.

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Authors and Affiliations

  1. Institute of Chemistry, Faculty of Natural Sciences and Mathematics, Sts. Cyril and Methodius University, POB 162, Arhimedova 5, 91000, Skopje, Republic of Macedonia

    Biljana Pejova

  2. Institute of Chemistry, Faculty of Natural Sciences and Mathematics, Sts. Cyril and Methodius University, POB 162, Arhimedova 5, 91000, Skopje, Republic of Macedonia

    Metodija Najdoski, Ivan Grozdanov & Ardijana Isahi

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  1. Biljana Pejova
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  2. Metodija Najdoski
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  3. Ivan Grozdanov
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  4. Ardijana Isahi
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Pejova, B., Najdoski, M., Grozdanov, I. et al. Chemical solution method for fabrication of nanocrystalline iron(III) oxide thin films. Journal of Materials Science: Materials in Electronics 11, 405–409 (2000). https://doi.org/10.1023/A:1008967205035

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