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

• Published in: Sensors and actuators. B, Chemical Chemical, 2020-03, Vol.306, p.127615, Article 127615
• Main Authors: Lashkov, Andrey V., Fedorov, Fedor S., Vasilkov, Mikhail Yu, Kochetkov, Alexey V., Belyaev, Ilia V., Plugin, Ilia A., Varezhnikov, Alexey S., Filipenko, Anastasia N., Romanov, Stepan A., Nasibulin, Albert G., Korotcenkov, Ghenadii, Sysoev, Victor V.
• Format: Article
• Language: English
• Subjects: Acetone; Alcohols; Anatase; Anodization; Electrodes; Gas sensors; Nanostructured materials; Nanotubes; One electrode; Organic vapor; Raman spectroscopy; Selectivity; Sensors; Ti wire; Titanium dioxide; Titanium oxide nanotube; Wire
• ISSN: 0925-4005; 1873-3077
• DOI: 10.1016/j.snb.2019.127615

[Display omitted] •New Ti wire-based platform for catalytic and one-electrode sensors has been developed.•The Ti-TiO2 nanotube platform is simple and cost-effective to fabricate a gas sensor.•One-electrode sensors based on Ti wire platform are feasible for detection of organic vapors and development of E-nose. 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.