• G. B. Shelke
• D. R. Patil

Abstract : Metal oxide based solid state gas sensors are the best selection to the development of commercial gas sensors for a wide range of applications. The great interest of industrial and domestic solid state gas sensors comes from their versatile advantages like portable size, high sensitivity in detecting very low concentrations (ppm, ppb or sub ppb level). Tin Oxide (SnO2) powder is one such challenging material for the fabrication of gas sensors. Bulk Tin Oxide (SnO2) powder in the form of thick film was observed to be less sensitive to the polluting gases. So, synthesized nanostructured SnO2 powder was fabricated by simple screen printing technique followed by the calcinations at 500oC for 1 hr. Thick films of pure nanostructured SnO2 powder were surface activated by dipping them into 0.01 M aqueous solution of Strontium Chloride and / or Bismuth Chloride for different intervals of time followed by calcinations at 500oC for 30 min. The films exhibit the semiconducting nature due to non-stoichiometry and respond to various gases. Optimizing the particular conditions, the thick films can be used for gas sensing to detect hazardous gases, viz. H2, H2S, Cl2, NH3, C2H5OH, LPG, etc. The surface morphology, chemical composition, crystal structure, electrical and thermal properties of the bulk and nanostructured SnO2 have been investigated by Field Emission Scanning Electron Microscope (FE-SEM), Energy Dispersive Analysis by X-rays (E-DAX), X-Ray Diffraction (XRD), etc.

Index Terms - Bulk and Nanostructured SnO2, Synthesis, Thick Films, Polluting gases, etc.

"Advancement in Structural, Electrical and Gas Sensing Performance of Surface Modified SnO2 Metal Oxides", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 6, page no.171-178, June 2019, Available :http://www.jetir.org/papers/JETIR1906U59.pdf

"Advancement in Structural, Electrical and Gas Sensing Performance of Surface Modified SnO2 Metal Oxides", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 6, page no. pp171-178, June 2019, Available at : http://www.jetir.org/papers/JETIR1906U59.pdf