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Design of a Metal-Oxide Solid Solution for Sub-ppm H2 Detection.

Elena Spagnoli1, Andrea Gaiardo2, Barbara Fabbri1

  • 1Department of Physics and Earth Sciences, University of Ferrara, via Giuseppe Saragat 1, Ferrara 44122, Italy.

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|February 16, 2022
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Summary

This study developed a highly sensitive hydrogen (H2) gas sensor using a niobium-doped tin-titanium oxide film. The novel sensor achieves reliable H2 detection at sub-ppm levels, crucial for industrial safety and renewable energy storage.

Keywords:
(Sn,Ti,Nb)xO2H2 detectionchemoresistive gas sensorsmetal-oxide solid solutionnanostructured MOX

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Sensor Technology

Background:

  • Hydrogen (H2) is vital for industry and renewable energy storage but poses safety risks due to its high explosivity.
  • Reliable detection of H2 at sub-parts per million (ppm) concentrations is essential for safety in industrial applications, storage, and transportation.
  • Chemoresistive gas sensors offer a promising, low-cost solution for H2 monitoring, but require further development for enhanced sensitivity and reliability.

Purpose of the Study:

  • To design and develop a novel sensing film for high-sensitivity hydrogen (H2) detection.
  • To investigate the effect of niobium (Nb) doping on the sensing properties of tin-titanium (Sn-Ti) oxide solid solutions.
  • To achieve reliable H2 detection at sub-ppm concentrations for improved safety and monitoring.

Main Methods:

  • Synthesis of Sn-Ti oxide solid solutions with varying Nb concentrations (1.5-5 atom %) using the sol-gel technique.
  • Thermal treatment of synthesized powders at 650 °C and 850 °C.
  • Fabrication and testing of chemoresistive gas sensors based on the prepared solid solutions.

Main Results:

  • The sensor based on the Sn-Ti oxide solid solution calcined at 650 °C with the lowest Nb content demonstrated exceptionally high sensitivity to H2.
  • This optimized sensor design enables H2 detection at the parts per billion (ppb) level.
  • Compared to pure SnO2 and undoped (Sn,Ti)O2, the response to 50 ppm H2 was increased sixfold and twofold, respectively.

Conclusions:

  • Niobium doping effectively enhances the H2 sensing performance of Sn-Ti oxide solid solutions.
  • The developed sensing film shows significant potential for highly sensitive and reliable H2 detection at sub-ppm concentrations.
  • This advancement contributes to improved safety protocols in industries utilizing hydrogen and in renewable energy storage systems.