Study On The Preparation And Properties Of Undoped And Doped SnO₂ Nanometre Particles

The SnO₂ is a kind of important semi-conductor oxide metals having wide band-gap.The SnO₂ nanometre paritcles have been used in many fields, for example: gas semi-conductor material,wetness semi-conductor material,transparent conduct electricity thin film,optical glass,porcelain and ceramics,pigment and luminescence material,solar cell,the chemistry electrode...etc. In this article, we prepare a sery of SnO₂ nanometre particles with sol-gel method: SnO₂ nanometre particles , Sb3+ doped SnO₂ nanometre particles, Sm3+ doped SnO₂ nanometre particles, and make a comprehensive study of the structural, morphological and luminescent properties by using X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), DTA and fluorescence spectrophotometry to give some explanations of the samples'structure, appearance and luminescence properties . The main contents and the important results are listed as followings:1. Pure SnO₂ nanometre particles are prepared with sol-gel method, the mean grain size of the materials ranges from 10nm to 40nm by controlling annealing temperature, annealing time and PH , band-gap is 3.6eV.2. Sb3+ doped SnO₂ nanometre particles are prepared with sol-gel method , the mean grain size of the materials ranges from 10nm to 30nm, when we increase the annealing tempretature, the grain size of the materials become bigger and the particles's cristalization become better. When the Sb3+ is doped, the sample's structure will not be changed.3.Sm3+ doped SnO₂ nanometre particles are prepared with sol-gel method , the mean grain size of the materials ranges from 20nm to 30nm, When the Sm3+ is doped, the sample's structure will not be changed. When excited at 369 nm, photoluminescence emission of Sm3+ can be observed, the emission's peaks ia at 369nm,468nm,552nm. In the end, we analysize the effect on photoluminescence properties when doping consistence and annealing time change,and analysize the theories of emission in room tempreture and emission of Sm3+.