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Issue 6, 2014
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Hydrothermally grown porous FeVO4 nanorods and their integration as active material in gas-sensing devices

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Abstract

Controllable fabrication of highly porous iron vanadate (FeVO4) thick film consisting of disordered nanorods suitable for gas penetration and permeation was achieved by hydrothermal synthesis of fervanite-like FeVO4·1.1H2O. The subsequent dehydration to FeVO4 was investigated by 57Fe Mössbauer spectroscopy (ΔQS), DTA, magnetic susceptibility (χ) and electron microscopy (REM/TEM). Their integration in gas sensing devices as porous layer via polymer-blended (PVDF) doctor-blading approach was successfully demonstrated followed by investigations of their electric properties and oxygen sensing capability. The probed IU behaviour and UV-Vis measurements confirmed the semiconducting nature of triclinic FeVO4 (Eg = 2.72 eV) and exhibited an activation energy for electric conduction of 0.46 eV. The best sensitivity of 0.29 ± 0.01 (m = −3.4 ± 0.1) could be obtained at an optimal working temperature of 250 °C.

Graphical abstract: Hydrothermally grown porous FeVO4 nanorods and their integration as active material in gas-sensing devices

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Publication details

The article was received on 21 Jul 2013, accepted on 18 Nov 2013 and first published on 22 Nov 2013


Article type: Paper
DOI: 10.1039/C3TA12821K
J. Mater. Chem. A, 2014,2, 1862-1868

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    Hydrothermally grown porous FeVO4 nanorods and their integration as active material in gas-sensing devices

    T. Lehnen, M. Valldor, D. Nižňanský and S. Mathur, J. Mater. Chem. A, 2014, 2, 1862
    DOI: 10.1039/C3TA12821K

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