• R.R.ATTARDE

: Nanostructured MnO2 powders were synthesized by the hydrolysis of AR grade manganese chloride in aqueous-alcohol solution with bismuth chloride (dopant in the proportion 1, 3, 5 and 7 wt %) to get fine powder. Thick films of SnO2-doped MnO2 powders were prepared by screen printing technique. The structural properties of Nanostructured SnO2 doped MnO2 thick films were studied by X-ray diffraction technique. The XRD spectrum revels that the films are polycrystalline in nature and tetragonal in structure. The unit cell volume was evaluated as 71.81. The SEM micrographs show a number of spherical and granular particles of Sn-species distributed uniformly with smaller size and shape among the MnO2 grains. The average particle size ranges from 40 nm to 114 nm. It is clear that the numbers of Sn-species are distributed among MnO2 grains in larger amount than in others decreasing the porosity which in turn decreased the adsorption of the gas molecules inside the pores, leading to decrease in the effective surface area or surface to volume ratio. The symmetrical I-V characteristics suggest that the contacts fabricated on the films were ohmic in nature and the p-n junctions were randomly distributed on the surface of the film. The increase in conductivity with increasing temperature (above 1000C) could be attributed to negative temperature coefficient and semiconducting nature of the SnO2 activated MnO2 samples. The SnO2 activated films showed very high electrical resistance of the order of 107  in air.

SnO2-doped,MnO2, XRD, SEM, conductivity

"Synthesis and Characterization of Nanostructured SnO2 doped MnO2 thick films for Sensing Applications", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 6, page no.794-798, June 2019, Available :http://www.jetir.org/papers/JETIR1908274.pdf

"Synthesis and Characterization of Nanostructured SnO2 doped MnO2 thick films for Sensing Applications", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 6, page no. pp794-798, June 2019, Available at : http://www.jetir.org/papers/JETIR1908274.pdf