Universität zu Köln

Lehnen, Thomas, Valldor, Martin, Niznansky, Daniel ORCID: 0000-0001-5740-1604 and Mathur, Sanjay (2014). Hydrothermally grown porous FeVO4 nanorods and their integration as active material in gas-sensing devices. J. Mater. Chem. A, 2 (6). S. 1862 - 1869. CAMBRIDGE: ROYAL SOC CHEMISTRY. ISSN 2050-7496

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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 center dot 1.1H(2)O. The subsequent dehydration to FeVO4 was investigated by Fe-57 Mossbauer spectroscopy (DQS), DTA, magnetic susceptibility (c) 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 I-U behaviour and UV-Vis measurements confirmed the semiconducting nature of triclinic FeVO4 (E-g = 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 degrees C.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Lehnen, Thomas UNSPECIFIED UNSPECIFIED UNSPECIFIED Valldor, Martin UNSPECIFIED UNSPECIFIED UNSPECIFIED Niznansky, Daniel UNSPECIFIED orcid.org/0000-0001-5740-1604 UNSPECIFIED Mathur, Sanjay UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-452434
DOI:	10.1039/c3ta12821k
Journal or Publication Title:	J. Mater. Chem. A
Volume:	2
Number:	6
Page Range:	S. 1862 - 1869
Date:	2014
Publisher:	ROYAL SOC CHEMISTRY
Place of Publication:	CAMBRIDGE
ISSN:	2050-7496
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Inorganic Chemistry
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language TEMPERATURE OXYGEN SENSORS; ELECTROCHEMICAL PROPERTIES; METAL-OXIDES; THIN-FILMS; PRESSURE; ORTHOVANADATE; FORM; NANOCRYSTALS; DEGRADATION; SENSITIVITY Multiple languages Chemistry, Physical; Energy & Fuels; Materials Science, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/45243