Fig. 4: Sensing performances of the Pt-PPy+ and PPy0 LC sensor.
a The sensing responses of LC sensors with different sensing materials in the presence of 100 ppm NH3. b The variation percents of the f of the LC sensors with different sensing materials in the presence of 100 ppm NH3. c In situ Raman spectra of 10 Pt-PPy+ and PPy0 nanohybrid in a cycle of air-NH3-air exposure. The arrow illustrates the electron doping–dedoping process. d The resistance response of PPy+- and 10 Pt-PPy+ and PPy0-based resistors in the presence of NH3. e The S11-f curves of 10 Pt-PPy+ and PPy0-based LC sensors in air and in 100 ppm NH3. f The dynamic response curves of 10 Pt-PPy+ and PPy0-based LC sensors in 125 ppb−100 ppm. g The dynamic response curves of 10 Pt-PPy+ and PPy0-based LC sensors in 200 ppm−2000 ppm. h Sensing range comparison of our work and those reported wireless passive NH3 sensors. i The tres of PPy+- and 10 Pt-PPy+ and PPy0-based LC sensors in the presence of 2000 ppm NH3. j The tres comparison of our work and previously-reported NH3 sensors. Error bar: the standard deviation calculated with five independent tests. Source data are provided as a Source Data file.
