CuO nanowires (NWs) were grown by the thermal oxidation of Cu foil at 400 °C and gas sensors were fabricated by the deposition of a solution containing the CuO NWs. At 300-370 °C, the sensor resistance increased upon exposure to 30-100 ppm CO. This has been explained by the gas sensing characteristics of the p-type oxide semiconductor. In contrast, the sensor showed two opposite NO2 sensing behaviors; the resistance decreased upon exposure to 30-100 ppm NO2, but increased upon contact with ≤5 ppm NO2. The increase in resistance upon contact with both reducing CO and a low concentration of oxidizing NO2 gases provides a simple and novel sensing algorithm for air quality control in automotive cabins.
Bibliographical noteFunding Information:
This work was supported by KOSEF NRL Program grant funded by the Korean government (MEST) (No. R0A-2008-000-20032-0) and a grant from the Fundamental R&D Program for Core Technology of Materials (M2008010013) funded by the Ministry of Knowledge Economy, Republic of Korea.
- Automobile ventilation
- CuO nanowires
- Thermal oxidation
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Surfaces, Coatings and Films
- Metals and Alloys
- Electrical and Electronic Engineering
- Materials Chemistry