Scientific Results

Highly conductive titanium oxide nanotubes chemical sensors

Year: 2015

Authors: Comini E., Galstyan V., Faglia G., Bontempi E., Sberveglieri G.

Autors Affiliation: SENSOR Lab, Department of Information Engineering, University of Brescia and CNR-INO, Via Valotti 9, 25133 Brescia, Italy; INSTM and Chemistry for Technologies Laboratory, Department of Mechanical and Industrial Engineering, University of Brescia,Via Branze 28, 25133 Brescia, Italy

Abstract: Nb-TiO2 nanotubes arrays have been prepared by anodisation of Nb-Ti metallic films. After the annealing treatment the nanotubes are crystallized in the anatase phase. Conductance increased of several orders of magnitude thanks to the introduction of Nb. We have prepared conductometric sensors and evaluated their sensing properties towards different gases. Functional measurements demonstrated very good sensing performances towards ethanol, acetone and carbon monoxide. The gas sensing performances has been tested as a function of the dimensions of the nanotubes showing an improvement in chemical sensing as the internal diameter of the tubes get smaller. (C) 2015 Elsevier Inc. All rights reserved.

Journal/Review: MICROPOROUS AND MESOPOROUS MATERIALS

Volume: 208      Pages from: 165  to: 170

More Information: The work has been supported by the Italian MIUR through the FIRB Project RBAP115AYN \”Oxides at the nanoscale: multi-functionality and applications\” and the FIRB \”Rete Nazionale di Ricerca sulle Nanoscienze ItalNanoNet\” (Protocollo: RBPR05JH2P, 2009-2013). Authors are thankful to Mr. Nicola Poli for his technical support during the experiments.
KeyWords: Metal oxide; Titania; Nanotubes; Chemical sensing;
DOI: 10.1016/j.micromeso.2015.01.040

Citations: 24
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