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Electrospun In2O3-WO3-Pd heterojunction nanofibers for ultralow-concentration NO2 detection at low-temperature
Nguyen Huy Tan1, Dang Thi Thanh Le1, Matteo Tonezzer2
1Faculty of Electronic Materials and Devices, School of Materials Science and Engineering (SMSE), Hanoi University of Science and Technology (HUST), No. 1, Dai Co Viet, Hanoi, Viet Nam; ITIMS, Hanoi University of Science and Technology (HUST), No. 1, Dai Co Viet, Hanoi, Viet Nam.
We developed novel electrospun Indium Oxide-Tungsten Oxide-Palladium (In2O3-WO3-Pd) nanofibers for highly sensitive nitrogen dioxide (NO2) detection. These sensors offer exceptional performance at low temperatures, enabling next-generation gas sensing applications.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Sensing
Background:
- Nitrogen dioxide (NO2) is a harmful pollutant requiring sensitive detection methods.
- Existing gas sensors often require high operating temperatures, limiting their practical application.
- Developing low-temperature sensors with high sensitivity and selectivity is crucial.
Purpose of the Study:
- To design and fabricate electrospun one-dimensional Indium Oxide-Tungsten Oxide-Palladium (In2O3-WO3-Pd) heterojunction nanofibers.
- To investigate the NO2 sensing performance of these nanofibers at low operating temperatures.
- To understand the structure-property relationships governing their sensing capabilities.
Main Methods:
- Electrospinning technique for fabricating In2O3-WO3-Pd nanofibers.
- Advanced characterization using FESEM, XRD, HRTEM, EDX, and XPS.
- Gas sensing measurements to evaluate response, selectivity, limit of detection, and stability.
Main Results:
- Uniform In2O3-WO3-Pd heteronanofibers with well-defined interfaces were successfully synthesized.
- The optimized sensor (In2O3-WO3 (90:10) + 0.01 wt% Pd) showed an exceptional response to 1 ppm NO2 at 150°C.
- A remarkable limit of detection of 73 ppt was achieved, with significant enhancements over pristine materials.
- The sensor demonstrated rapid response/recovery, excellent humidity tolerance, and long-term stability.
Conclusions:
- The synergistic effect between In2O3-WO3 heterojunctions and Pd catalytic sites enhances NO2 adsorption and reaction kinetics.
- Electrospun In2O3-WO3-Pd nanofibers are promising for next-generation low-temperature NO2 sensors.
- The developed sensors offer ultrahigh response, selectivity, and stability for environmental monitoring.
