Gas sensors with dual selectivity
are highly desirable for the
manufacture of high-performance, miniaturized, and low-cost sensor
prototypes. In this work, we introduce a dual selective gas sensor
with a temperature-dependent sensing behavior based on delafossite
CuCoO2 microcrystals. At room temperature, the sensor exhibits
an obvious response to amine with a good selectivity to n-BuNH2, while the sensor displays a special selective
response to triethylamine (TEA) at 250 °C. This dual sensing
behavior makes it convenient for analyzing the mixture gases of n-BuNH2 and TEA via constructing the sensor array
with a detection deviation below 10%. The sensor can also be applied
to evaluate the spoilage of meat that is operated at room temperature.
The temperature-dependent sensing behavior can be attributed to the
different adsorption behaviors of gas molecules on CuCoO2 along with the different oxidation abilities of oxygen ions generated
at different temperatures.