Structure, Magnetic and Photochemical Properties of Fe–TiO2 Nanoparticles Stabilized in Al2O3 Matrix


Cite item

Full Text

Open Access Open Access
Restricted Access Access granted
Restricted Access Subscription Access

Abstract

Fe–TiO2 nanoparticles with Fe concentration from 0.24 to 5 wt % were synthesized in a Al2O3 matrix through multiple impregnations from organic solutions of Ti n-butoxide and Fe acetylacetonate. Microstructure, morphology and magnetic properties of the composites were studied using X-ray analysis, transmission electron microscopy, energy-dispersive analysis, Mössbauer spectroscopy and magnetic susceptibility. It was shown that the deposition of the solution with low concentration of Ti n-butoxide leads to the formation of mostly extensive Fe–TiO2 films with a small fraction of individual Fe–TiO2 nanoparticles. On the contrary, the increase of Ti n-butoxide concentration results in the formation of a great number of individual Fe–TiO2 nanoparticles on Al2O3. The size of these particles increases from 2–3 nm to 5–8 nm with the increase of Fe content in the samples from 0.24 to 1.0 (wt %). Mössbauer spectroscopy revealed two types of magnetic ions. The first type of paramagnetic Fe3+ demonstrate spin–lattice relaxation properties while another one substitutes Ti4+ in the TiO2 structure thus forming Fe–TiO2 stabilized particles in the matrix. According to the magnetic data antiferromagnetic and ferromagnetic types of exchange spin coupling occur in Fe–TiO2/Al2O3 composites. The increase of Fe concentration in the composites from 1 to 5 wt % results in the narrowing of the TiO2 band gap from 3.2 to 2.7 eV and shifting the absorption edge in visual spectrum from 350–400 to 450–500 nm.

About the authors

O. G. Ellert

Kurnakov Institute of General and Inorganic Chemistry RAS

Author for correspondence.
Email: oellert@yandex.ru
Russian Federation, Moscow, 119991

S. A. Nikolaev

Moscow State University

Email: oellert@yandex.ru
Russian Federation, Moscow, 119991

D. A. Maslov

Topchiev Institute of Petrochemical Synthesis RAS

Email: oellert@yandex.ru
Russian Federation, Moscow, 119991

O. V. Bukhtenko

Topchiev Institute of Petrochemical Synthesis RAS

Email: oellert@yandex.ru
Russian Federation, Moscow, 119991

Yu. V. Maksimov

Semenov Institute of Chemical Physics RAS

Email: oellert@yandex.ru
Russian Federation, Moscow, 119991

V. K. Imshennik

Semenov Institute of Chemical Physics RAS

Email: oellert@yandex.ru
Russian Federation, Moscow, 119991

D. I. Kirdyankin

Kurnakov Institute of General and Inorganic Chemistry RAS

Email: oellert@yandex.ru
Russian Federation, Moscow, 119991

A. A. Averin

Frumkin Institute of Physical Chemistry and Electrochemistry RAS

Email: oellert@yandex.ru
Russian Federation, Moscow, 119071

M. V. Tsodikov

Topchiev Institute of Petrochemical Synthesis RAS

Email: oellert@yandex.ru
Russian Federation, Moscow, 119991

Supplementary files

Supplementary Files
Action
1. JATS XML

Copyright (c) 2018 Pleiades Publishing, Ltd.