Figure 4.
Response of the sensor element using Co3O4 powder during exposure to NO2 (0, 0.5, 1, and 5 ppm) in air at (a) 100 °C and (b) 200 °C. The inset shows the relationship between the sensor response and NO2 concentration.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.