Nanocrystalline ZnO(Ga): Paramagnetic centers, surface acidity and gas sensor properties

Nataliya Vorobyeva, Marina Rumyantseva, Darya Filatova, Elizaveta Konstantinova, Diana Grishina, Artem Abakumov, Stuart Turner, Alexander Gaskov

Research output: Contribution to journalArticlepeer-review

61 Citations (Scopus)

Abstract

Nanocrystalline ZnO and ZnO(Ga) samples with different gallium content were prepared by wet-chemical method. Introduction of gallium leads to the increase of amount of weak acid sites such as surface hydroxyl groups. Gas sensing properties toward 0.2-2 ppm H2S and NO2 were studied at 100-450 C by DC conductance measurements. The optimal temperature for gas sensing experiments was determined. Sensor signal toward H2S decreases with increase of Ga concentration. The dependence of ZnO(Ga) sensor signal to NO2 on the gallium content has non-monotonous character, which correlates with the change of conductivity of the samples in air and concentration of paramagnetic donor states.

Original languageEnglish
Pages (from-to)555-564
Number of pages10
JournalSensors and Actuators, B: Chemical
Volume182
DOIs
Publication statusPublished - 2013
Externally publishedYes

Keywords

  • Acidic properties
  • EPR study
  • Gallium doped zinc oxide
  • Gas sensing

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