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ORIGINAL RESEARCH article

Front. Chem.
Sec. Electrochemistry
Volume 12 - 2024 | doi: 10.3389/fchem.2024.1480294

Promoted room temperature NH3 gas sensitivity using interstitial Na dopant and structure distortion in Fe0.2Ni0.8WO4

Provisionally accepted
Myung Sik Choi Myung Sik Choi 1*Jong Hyun Lee Jong Hyun Lee 2Seung Yong Lee Seung Yong Lee 2Kyu Hyoung Lee Kyu Hyoung Lee 2*
  • 1 Kyungpook National University, Daegu, Republic of Korea
  • 2 Yonsei University, Seoul, Seoul, Republic of Korea

The final, formatted version of the article will be published soon.

    The demand for gas-sensing operations with lower electrical power and guaranteed sensitivity has increased over the decades due to worsening indoor air pollution. In this report, we develop roomtemperature operational NH3 gas-sensing materials, which are activated through electron doping and crystal structure distortion effect in Fe0.2Ni0.8WO4. The base material, synthesized through solid-state synthesis, involves Fe cations substitutionally located at the Ni sites of the NiWO4 crystal structure and shows no gas-sensing response at room temperature. However, doping Na into the interstitial sites of Fe0.2Ni0.8WO4 activates gas adsorption on the surface via electron donation to the cations. Additionally, the hydrothermal method used to achieve a more than 70-fold increase in the surface area of structure-distorted Na-doped Fe0.2Ni0.8WO4 powder significantly enhances gas sensitivity, resulting in a 4-times increase in NH3 gas response (Rg/Ra). Photoluminescence and XPS results indicate negligible oxygen vacancies, demonstrating that cation contributions are crucial for gassensing activities in Na-doped Fe0.2Ni0.8WO4. This suggests the potential for modulating gas sensitivity through carrier concentration and crystal structure distortion. These findings can be applied to the development of room-temperature operational gas-sensing materials based on the cations.

    Keywords: metal oxide, NiWO4, Gas sensor, NH3 gas, co-doping

    Received: 13 Aug 2024; Accepted: 14 Oct 2024.

    Copyright: © 2024 Choi, Lee, Lee and Lee. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence:
    Myung Sik Choi, Kyungpook National University, Daegu, Republic of Korea
    Kyu Hyoung Lee, Yonsei University, Seoul, 03722, Seoul, Republic of Korea

    Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.