Sensing Capability of Air Plasma-Sprayed SnO2 Coating in the Presence of Hydrogen and Carbon Monoxide

  • V. Ambardekar
  • P. P. BandyopadhyayEmail author
  • S. B. Majumder


This report deals with the sensing characteristics of hydrogen (H2) and carbon monoxide (CO) gases using a tin oxide (SnO2) functional coating deposited on an alumina plate using air plasma spraying technique. This coating exhibits a porous morphology that contains both mesoporous and macroporous regions conducive to superior gas sensing. Initially, gas sensing measurements were performed by varying the operating temperature at a fixed gas concentration using a dynamic sensing setup. The coating showed maximum response % at 275 °C for H2 and CO gases. However, higher response % was obtained in the presence of H2 over CO. Sensing performance was further investigated by varying the target gas concentration at 275 °C. The coating exhibited a higher response for H2 compared to that of other plasma-sprayed SnO2 coating reported in the literature. The SnO2 coating under investigation demonstrated good sensor response and repeatability, moderate operating temperature and quick response time.


air plasma spray gas sensing porous morphology SnO2 coating 



The above research work was partially supported by the research grant obtained from CSIR, Government of India; vide sanction Letter No. 03/(1371)/16/EMR-II, dated 10-05-2016 and DST, Government of India; vide sanction letter Nos. 5(1)/2017-NANO dated 28-03-2018 and DST/NM/NNETRA/2018(G)-IITKGP dated 21-03-2018.

Conflict of interest

The authors declare that they have no conflict of interest.


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Copyright information

© ASM International 2019

Authors and Affiliations

  • V. Ambardekar
    • 1
  • P. P. Bandyopadhyay
    • 1
    Email author
  • S. B. Majumder
    • 2
  1. 1.Department of Mechanical EngineeringIndian Institute of TechnologyKharagpurIndia
  2. 2.Materials Science Centre, Indian Institute of TechnologyKharagpurIndia

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