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A highly sensitive and selective hydrogen gas sensor from thick oriented films of MoS2

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Abstract

A new process is developed to fabricate a highly sensitive and selective hydrogen sensor by depositing a partially crystalline and highly oriented film of MoS2 from its single layer suspension on an alumina substrate. When these films are promoted with some catalysts selected from Pt-group metals (Pt, Pd, Ru or any combination of these metals) they exhibit a high sensitivity and selectivity to hydrogen gas. Unlike other metal oxide sensors which are sensitive to many reducing and oxidizing gases and operate at a temperature of 350 °C or higher; this sensor is highly selective to hydrogen gas and its operating temperature is from 25 to 150°C. The lower operating temperature enhances safety when dealing with hydrogen gas. The sensor response to hydrogen at 120 °C is linear in concentration from 30 to 104 ppm with a 10 to 30 second response time and a 45 to 90 second recovery time. Above 104 ppm the sensor is still linear but the slope of conductance versus hydrogen concentration changes.

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References

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Authors and Affiliations

  1. Department of Physics, Simon Fraser University, V5A 1S6, Burnaby, B.C.

    Bijan K. Miremadi, Ravi C. Singh, S. Roy Morrison & Konrad Colbow

Authors
  1. Bijan K. Miremadi
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  2. Ravi C. Singh
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  3. S. Roy Morrison
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  4. Konrad Colbow
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Miremadi, B.K., Singh, R.C., Morrison, S.R. et al. A highly sensitive and selective hydrogen gas sensor from thick oriented films of MoS2 . Appl. Phys. A 63, 271–275 (1996). https://doi.org/10.1007/BF01567880

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  • DOI: https://doi.org/10.1007/BF01567880

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