• R.P. Ikhar
• G. T. Lamdhade
• K. B. Raulkar

PPy-SnO2 ammonia gas sensor was fabricated using Al2O3 base on clean glass plate. The prepared material was characterized using X-ray diffraction and Scanning electron Microscopy. From XRD, it was found that composition 40SnO₂:60PPy (sensor N4) exhibits a smaller crystallite size (38.2 nm) due to the significant influence of the higher concentration of polypyrrole (PPy) in the composite. SEM picture exhibited the particle size of N4 sensor is in the range of 20 - 40 nm with very high porosity due to open, sponge-like porous network morphology. Due to high porosity and enhanced surface reactivity, N4 sensor exhibited the highest sensitivity, reaching approximately 1.45 at 70 ppm.

SnO2-PPy composites thick layer, Al2O3, Screen Printing Technique, sensitivity.

"Synthesis and Characterization of Conducting Polypyrrole Based Composites with SnO2 to Sense NH3 Gas at room temperature", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.12, Issue 7, page no.h532-h539, July-2025, Available :http://www.jetir.org/papers/JETIR2507770.pdf

"Synthesis and Characterization of Conducting Polypyrrole Based Composites with SnO2 to Sense NH3 Gas at room temperature", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.12, Issue 7, page no. pph532-h539, July-2025, Available at : http://www.jetir.org/papers/JETIR2507770.pdf