Sensor Properties of Nanostructured Systems Based on Indium Oxide with Co3O4 or ZrO2 Additives
- 27 Downloads
The effect of Co3O4 and ZrO2 additives on the sensory response of In2O3-based nanostructured composites to H2 and CO is studied. It is shown that the addition of small amounts of Co3O4 or ZrO2 to In2O3 leads to a sharp increase in the sensory response to hydrogen. The maximum sensory response of the ZrO2−In2O3 composite to 1100 ppm of hydrogen increases from 80 to 270 as the ZrO2 content changes 0 to 20 wt %. The response to CO varies only slightly. For Co3O4−In2O3 composites, the maximum response to H2 and CO increases with the Co3O4 content within 0−10 wt %. A further increase in the Co3O4 content leads to a significant decrease in the response, with composites containing ∼60 wt % Co3O4 being characterized by a very low efficiency. In the Co3O4−In2O3 system with a content of up to 60 wt % Co3O4, electronic conduction is realized, which changes to hole conduction at Co3O4 within 80−100 wt %. In the ZrO2−In2O3 system, electric current flows through In2O3 nanocrystals, i.e., n-type conduction takes place. Possible reasons for the observed effects are discussed.
Keywordsnanocomposites conductivity In2O3 Co3O4 ZrO2 sensory response reducing gases n- and p-type semiconductors
Unable to display preview. Download preview PDF.
- 3.L. I. Trakhtenberg, G. N. Gerasimov, V. F. Gromov, et al., in Chemical Sensors: Simulation and Modeling, Ed. by G. Korotcenkov (Momentum, New York, 2012), p. 261.Google Scholar
- 6.G. N. Gerasimov, V. F. Gromov, and L. I. Trakhtenberg, Synthesis, Structure, and Properties of Metal–Semiconductor Systems Containing Nanostructured Composites, Ed. by L. I. Trakhtenberg and M. Ya. Mel’nikov (Tekhnosfera, Moscow, 2016), p. 487 [in Russian].Google Scholar