UV effect on NO2 sensing properties of nanocrystalline In2O3

A. Ilin, M. Martyshov, E. Forsh, P. Forsh, M. Rumyantseva, A. Abakumov, A. Gaskov, P. Kashkarov

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)


Nanocrystalline indium oxide films with extremely small grains in range of 7-40 nm are prepared by sol-gel method. The influence of grain size on the sensitivity of indium oxide to nitrogen dioxide in low concentration at room temperature is investigated under the UV illumination and without illumination. The sensitivity increases with the decrease of grain sizes when In2O3 is illuminated while in the dark In2O3 with intermediate grain size exhibits the highest response. An explanation of the different behavior of the In2O3 with different grain size sensitivity to NO2 under illumination and in the dark is proposed. We demonstrate that pulsed illumination may be used for NO2 detection at room temperature that significantly reduces the power consumption of sensor.

Original languageEnglish
Pages (from-to)491-496
Number of pages6
JournalSensors and Actuators, B: Chemical
Publication statusPublished - 1 Aug 2016


  • InO
  • NO detection
  • Room temperature metal oxide gas sensor
  • UV desorption


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