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Related Experiment Video

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Electrospun Pd-Loaded ZnTiO3/ZnO Nanotubes with Engineered Heterostructures for ppb-Level Hydrogen Sensing.

Ze Qiu1, Zichen Huang1, Siguang Li1

  • 1Institute of Smart City and Intelligent Transportation, Southwest Jiaotong University, Chengdu 611756, China.

ACS Applied Materials & Interfaces
|December 16, 2025
PubMed
Summary

Highly sensitive hydrogen sensors were developed using palladium-loaded ZnTiO3/ZnO heterojunction nanotubes. These sensors achieve parts per billion detection limits for enhanced safety monitoring of flammable hydrogen gas.

Keywords:
H2 sensorPd-loaded ZnTiO3/ZnO nanotubescoaxial spinningheterojunctionsppb concentration

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Sensing

Background:

  • Hydrogen gas poses significant safety risks due to its flammability and wide explosion limits.
  • Conventional metal oxide semiconductor (MOS) sensors lack the sensitivity and selectivity required for reliable hydrogen detection at low concentrations.
  • There is a critical need for advanced sensor technologies capable of detecting hydrogen at parts per billion (ppb) levels for safety applications.

Purpose of the Study:

  • To develop a novel hydrogen sensor with enhanced sensitivity, selectivity, and rapid response/recovery times.
  • To investigate the structure-property relationships of palladium-loaded ZnTiO3/ZnO heterojunction nanotubes for gas sensing applications.
  • To establish a scalable fabrication method for high-performance hydrogen sensors.

Main Methods:

  • Fabrication of Pd-loaded ZnTiO3/ZnO heterojunction nanotubes via coaxial electrospinning followed by staged pyrolysis.
  • Characterization of the nanotube architecture, heterojunction formation, and surface properties.
  • Evaluation of the sensor's performance (response, detection limit, selectivity, response/recovery times) for hydrogen gas at various concentrations and temperatures.

Main Results:

  • The fabricated hollow nanotube architecture significantly increased surface area and active sites, facilitating gas diffusion and adsorption.
  • The optimized ZnTiO3/ZnO heterojunction nanotubes with 3 wt% Pd loading exhibited an ultrahigh response to 1000 ppm H2 (Ra/Rg = 43,680) at 260 °C.
  • The sensor achieved an exceptionally low detection limit of 50 ppb for hydrogen, with rapid response (20 s) and recovery (162 s) times.
  • Demonstrated excellent selectivity towards hydrogen over other common gases like NH3, CH4, and C2H6O.

Conclusions:

  • The Pd-loaded ZnTiO3/ZnO heterojunction nanotubes offer a promising platform for developing highly sensitive and selective hydrogen sensors.
  • The unique hollow nanotube structure and efficient p-n heterojunctions are crucial for the enhanced gas sensing performance.
  • This research provides a scalable strategy for fabricating advanced sensors capable of detecting hydrogen at ppb levels, crucial for safety monitoring and industrial applications.