SYNTHESIS AND CHARACTERIZATION OF PURE AND Mn DOPED SnO2 NANOPARTICLES

Abstract

Tin Oxide (Sn02) is a widely used material in gas sensing material, transparent conducting oxide, glass coating, and photo catalysts. In modern era tin oxide is widely used in glass window and smart windows. Pure tin oxide has a good sensing property so it has property of varistor i.e. variable resistor. When we doped transition metal into the Sno2 then it shows more properties and used in various device in spintronics. Chapterl gives the of the characterisation of Tin oxide (Sn02) nanoparticles. From the literature we have found that in some papers say that pure tin oxide nanoparticles are paramagnetic but other some says that these are ferromagnetic at room temperature but it not clear till now that what kind of magnetic properties in Tin oxide (Sn02)material so it is under research. In literature, the various properties of tin oxide are studied like electrical, optical, magnetic, dielectric etc. In the present work we have been studied the optical, structural and magnetic properties of the Tin oxide (Sn02) Nanoparticles. Chapter2 describe the synthesis and characterization of Mn doped Tin oxide nanoparticles. When we doped TM into the Sn02 it show magnetism and works like dilute magnetic semiconductor. When we doped transition metal in these type of oxide then the substitution affect the properties of these oxides and extensive changes are seen . When transition metal doped into the dilute magnetic oxides (DM0) such as TiO2, ZnO, S1102 etc., it induces ferromagnetism at room temperature, which generates particular attention in spintronic devices. Transition metal doped Sn02 shows electrical, optical, magnetic and sensing properties. The charge ordering is found as its magnetic response from the reconstruction of the charge density in the unit cell and some other experiments and theories also shows the Para magnetic to diamagnetic transition with respect to doping concentration of Mn which is explained by using defect chemistry and the charge ordering. However, in V and Mn-doped Sn02, paramagnetism is more stable than ferromagnetism. In the present work we study the magnetic properties of Mn doped tin oxide nanoparticles at room temperature and low temperature 10K.