Study on sensitive characteristics of three-electrode carbon nanotube sensors

• 1、State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University，Xi'an 710049
• 2、Electric Power Research Institute, State Grid Shaanxi Electric Power Company,Xi'an 710199

Abstract：NO2, NO and SO2 produced by industrial combustion process are the main sources of atmospheric pollution. Almost all available technologies of measuring the three components in gas mixtures are limited by cross-sensitivity. Here we report an array with three triple-electrode carbon nanotube sensors and its sensitivity to the three flue gas components. Each sensor operates at the same mechanism and is comprised of a cathode, an extracting electrode and a collecting electrode, and is set by different electrode separations with 75 μm, 100 μm and 120 μm, respectively. We explored voltages influence on the sensitivity applied on electrodes, and simultaneously obtained distinct single-valued sensitive characteristics to the three-component gases at given voltages. With a high level of integration and a small size, the array displays a potential to detect concentrations of different components of gas mixtures.

Keywords： Carbon nanotubes ionization sensor array mixed gases