The Ti wire functionalized with inherent TiO2 nanotubes by anodization as one-electrode gas sensor: A proof-of-concept study

We propose a Ti wire functionalized with inherent anatase TiO2 nanotubes by an anodization process to serve as a one-electrode gas sensor. The design is similar to other known one-electrode gas sensors when the wire is employed both as a heater and measuring resistive element. We discuss the low-cost fabrication protocol, the structure of the sensor characterized by Raman spectroscopy and electron microscopy, and show the proof-of-concept sensor responses to a few organic vapors, acetone and alcohols, in mixture with air. We have found the response-to-concentration curves to follow a linear fit with a detection limit below 1000 ppm. These findings enlarge the range of possible gas sensor architectures based on nanostructured material for research and practical applications.

Keywords

Anodization, One electrode, Organic vapor, Selectivity, Ti wire, Titanium oxide nanotube

DOI

10.1016/j.snb.2019.127615

Citation

Lashkov, A V, Fedorov, F S, Vasilkov, M Y, Kochetkov, A V, Belyaev, I V, Plugin, I A, Varezhnikov, A S, Filipenko, A N, Romanov, S A, Nasibulin, A G, Korotcenkov, G & Sysoev, V V 2020, ' The Ti wire functionalized with inherent TiO 2 nanotubes by anodization as one-electrode gas sensor : A proof-of-concept study ', Sensors and Actuators, B: Chemical, vol. 306, 127615 . https://doi.org/10.1016/j.snb.2019.127615

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https://urn.fi/URN:NBN:fi:aalto-202002122139

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[article-cris] Kemian tekniikan korkeakoulu / CHEM

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The Ti wire functionalized with inherent TiO2 nanotubes by anodization as one-electrode gas sensor: A proof-of-concept study

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