Table 2. Frequency and Time Response of the Four Kinds of Sensors at 4 ppm.
| coated material | frequency response (Hz) | response time (s) | recovery time (s) |
|---|---|---|---|
| PAAm | 2 | 140 | 160 |
| PAAm/MWCNTs | 3 | 80 | 100 |
| PVAm | 2.5 | 365 | 200 |
| PVAm/MWCNTs | 4.5 | 485 | 195 |
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