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From

Electrical and Gas Sensing Behaviour of Polypyrrole/silver Sulphide Nanocomposites

Bharati Yeole, Tanushree Sen, Dharmesh Hansora, Satyendra Mishra

American Journal of Sensor Technology. 2017, 4(1), 10-20 doi:10.12691/ajst-4-1-2
  • Figure 1. Gas sensing apparatus
  • Scheme 1. Oxidative polymerization of pyrrole
  • Figure 2. Pictorial representation of formation of PPy/Ag2S NCs
  • Figure 3. FTIR spectra of PPy and various PPy/Ag2S NCs
  • Figure 4. UV absorption of PPy, PPy/Ag2S (3 wt%) NCs (A3)
  • Figure 5. XRD of (a) Pure PPy, (b) Ag2S NPs, and (c) various PPy/Ag2S NCs
  • Figure 6. SEM micrographs of (a) Ag2S NPs, (b) PPy, and (c) PPy/Ag2S NCs
  • Figure 7. EDX pattern of (a) Ag2S NPs and (b) PPy/Ag2S NCs
  • Figure 8. Electrical (I-V) characteristics of PPy and PPy/Ag2S NCs
  • Figure 9. Pictorial representation of a two-probe gas sensing setup
  • Figure 10. Response of PPy at different concentrations of NH3 gas
  • Figure 11. Response versus time graph of PPy/Ag2S NCs for 100 ppm NH3
  • Figure 12. Response of PPy/Ag2S NCs at different concentrations of NH3 gas
  • Scheme 2. Ammonia sensing mechanism by PPy sensor