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Related Experiment Video

Updated: Sep 11, 2025

The Effect of Interfacial Chemical Bonding in TiO2-SiO2 Composites on Their Photocatalytic NOx Abatement Performance
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An Ultra-Selective and Humidity-Resistant Room-Temperature-Operated NO2 Sensor Based on Black TiO2.

Xuelan Cheng1, Yizheng Liu1, Wei Zhong1

  • 1Shenzhen Key Laboratory of Ultraintense Laser and Advanced Material Technology, Center for Advanced Material Diagnostic Technology, and College of Engineering Physics, Shenzhen Technology University, Shenzhen, 518118, P. R. China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|August 11, 2025
PubMed
Summary

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This summary is machine-generated.

Black titanium dioxide (TiO2) enables ultra-selective, humidity-resistant nitrogen dioxide (NO2) sensing at room temperature. This novel material overcomes limitations of traditional TiO2, offering enhanced NO2 detection in mixed gases and varying humidity.

Area of Science:

  • Materials Science
  • Environmental Science
  • Chemical Engineering

Background:

  • Metal oxides, including titanium dioxide (TiO2), are common gas-sensing materials but suffer from poor selectivity and humidity interference.
  • Existing sensors often require elevated temperatures, limiting practical applications.

Purpose of the Study:

  • To develop an ultra-selective and humidity-resistant nitrogen dioxide (NO2) sensor operating at room temperature.
  • To investigate the sensing mechanism of black TiO2 for enhanced NO2 detection.

Main Methods:

  • Synthesis of black TiO2 and conventional white TiO2.
  • Fabrication and testing of gas sensors using both materials.
  • Analysis of gas response, selectivity, and humidity interference at room temperature.
Keywords:
NO2TiO2chemiresistive gas sensormetal oxidesselectivity

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  • Investigation of water adsorption mechanisms on TiO2 surfaces.

    • Main Results:

    • Black TiO2 demonstrated significantly enhanced NO2 selectivity and humidity resistance compared to white TiO2.
    • The NO2 response of black TiO2 was amplified by over 10 times while suppressing responses to common interfering gases and water vapor.
    • A wireless portable device was developed, capable of identifying NO2 in mixed atmospheres and distinguishing environmental conditions.
    • Surface analysis revealed suppressed water adsorption and formation of hydroxyl groups on black TiO2, contrasting with water layer formation on white TiO2.

    Conclusions:

    • Black TiO2 offers a promising solution for high-performance, room-temperature NO2 detection in humid, mixed-gas environments.
    • The study provides critical insights into the role of surface chemistry and water adsorption in modulating gas sensor performance.
    • This advancement paves the way for practical, reliable NO2 monitoring using common metal oxides.