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

Andrey V. Lashkov, Fedor S. Fedorov, Mikhail Yu Vasilkov, Alexey V. Kochetkov, Ilia V. Belyaev, Ilia A. Plugin, Alexey S. Varezhnikov, Anastasia N. Filipenko, Stepan A. Romanov, Albert G. Nasibulin, Ghenadii Korotcenkov, Victor V. Sysoev

    Research output: Contribution to journalArticlepeer-review

    18 Citations (Scopus)

    Abstract

    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.

    Original languageEnglish
    Article number127615
    JournalSensors and Actuators, B: Chemical
    Volume306
    DOIs
    Publication statusPublished - 1 Mar 2020

    Keywords

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

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