Figure 6

The butane gas-sensing properties of the sensor fabricated from PTO-4 nanoparticles at an operating temperature of 340 °C; (a) The dynamic response from 100 to 5000 ppm (the inset is the response/recovery time toward 3000 ppm butane gas), and (b) variation of gas response to different butane concentrations from 100 to 5000 ppm.