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UV-Activated Au Modified TiO

Su Zhang1, Baoyu Huang1, Zenghao Jiang1

  • 1School of Microelectronics, Dalian University of Technology, Dalian 116024, China.

Materials (Basel, Switzerland)
|June 10, 2023
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Summary

Gold-modified titanium dioxide/indium oxide (Au/TiO2/In2O3) hollow nanospheres show enhanced formaldehyde detection at room temperature. This novel sensor offers rapid response and high sensitivity, making it ideal for environmental monitoring.

Keywords:
Au modified TiO2/In2O3 hollow nanospheresUV activationin situ DRIFTSroom temperature formaldehyde sensors

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Sensing

Background:

  • Formaldehyde is a common indoor air pollutant with significant health implications.
  • Developing highly sensitive and selective sensors for formaldehyde detection at room temperature is crucial for effective monitoring.
  • Metal oxide-based nanomaterials offer promising properties for gas sensing applications.

Purpose of the Study:

  • To synthesize and characterize Au/TiO2/In2O3 hollow nanospheres.
  • To evaluate the formaldehyde sensing performance of the synthesized nanocomposite sensor.
  • To investigate the underlying mechanisms responsible for the enhanced sensing properties.

Main Methods:

  • Hydrolysis method using carbon nanospheres as sacrificial templates for hollow nanosphere synthesis.
  • Fabrication of chemiresistive-type gas sensors based on Au/TiO2/In2O3 nanocomposites.
  • Gas sensing measurements at room temperature under UV-LED irradiation.
  • In situ diffuse reflectance Fourier transform infrared spectroscopy (DRIFTS) for surface reaction analysis.

Main Results:

  • Au/TiO2/In2O3 hollow nanospheres exhibited superior formaldehyde sensing performance compared to pure TiO2, In2O3, and TiO2/In2O3 sensors.
  • The sensor showed a high response of 5.6 to 1 ppm formaldehyde, with a rapid response time of 18 s and recovery time of 42 s.
  • A low detection limit of 60 ppb formaldehyde was achieved.
  • DRIFTS analysis indicated that nanoheterojunctions and Au nanoparticle sensitization contribute to improved sensing.

Conclusions:

  • Au/TiO2/In2O3 hollow nanospheres represent a highly effective material for room-temperature formaldehyde detection.
  • The synergistic effects between Au nanoparticles, TiO2, and In2O3, facilitated by nanoheterojunctions, significantly enhance sensor performance.
  • The developed sensor shows great potential for practical applications in formaldehyde monitoring.