Hydrogen sensors with high humidity tolerance based on indium-tin oxide colloids

Guy Rahamim, Michael Mirilashvili, Pilkhaz Nanikashvili, Ehud Greenberg, Hagay Shpaisman, Dan Grinstein, Shmuel Welner, David Zitoun

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Hydrogen sensing in real environments is an important issue on the pathway toward the hydrogen economy. The use of semiconductor-based sensing layers has significantly advanced the detection limit of the H2 sensor, in part thanks to the additional use of catalytic metals which effectively dope their electron depletion layer. Nevertheless, these high-end sensors are highly sensitive to the environmental parameters (temperature and humidity) and require a complex fabrication process. Herein, we report a colloidal approach to the fabrication of indium-tin oxide combined with palladium-nickel or platinum nanoparticles sensing layer. The cross-sections of the sensing layers show the network of nanoparticles and voids responsible for the excellent sensing properties they display. The sensors show sensitivity from 4 % down to 70 ppm of H2 and repeatability in that range. Moreover, the sensors have a unique ability to be tolerant to the humidity level with similar sensing response whatever the humidity level in the broad range from 0 to 60 % relative humidity. This tolerance is attributed to the organic layer coating the nanoparticles.

Original languageEnglish
Article number127845
JournalSensors and Actuators, B: Chemical
Volume310
DOIs
StatePublished - 1 May 2020

Bibliographical note

Publisher Copyright:
© 2020

Keywords

  • Colloids
  • Gas sensor
  • Humidity
  • Hydrogen
  • ITO
  • Nanoparticles

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