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使用软化学方法在碱性溶液中制备出了颗粒尺寸分布均匀的SnO2纳米颗粒,使用透射电子显微镜(TEM)、X射线衍射(XRD)、光致发光谱(PL)和光吸收谱等方法分析与表征了SnO2纳米颗粒的结构和光学性能.实验中通过表面活性剂的加入来控制纳米颗粒的结晶与凝聚.XRD,TEM的结果表明,原始制备出的SnO2纳米颗粒的平均粒径小于4nm,为完好的晶体状态.纳米颗粒经过400—1000℃退火后晶粒尺寸进一步增大.光吸收谱表明,相对于体材料,纳米颗粒的禁带宽度展宽并随颗粒尺寸增大而红移.光致发光谱测试表明,不同温度下退火的SnO2纳米颗粒在350—750nm有较强的发光,研究表明这是来源于颗粒表面的氧空位缺陷发光.
SnO2nanoparticles with uniform particle size distribution were prepared by soft chemical method in alkaline solution and analyzed by transmission electron microscopy (TEM), X-ray diffraction (XRD), photoluminescence (PL) and optical absorption spectroscopy Characterization of the structure and optical properties of SnO2 nanoparticles.In the experiment, the addition of surfactant to control the crystallization and aggregation of nanoparticles.XRD, TEM results show that the average particle size of the original SnO2 nanoparticles prepared is less than 4nm, as Intact crystal state The grain size of the nanoparticles further increases after annealing at 400-1000 ° C. The optical absorption spectra show that the bandgap width of the nanoparticles broadens relative to the bulk material and red shifts with increasing particle size The results of emission spectroscopy showed that the SnO2 nanoparticles annealed at different temperatures have strong luminescence at 350-750nm, and the results show that this is due to the oxygen vacancy defects emitted from the surface of the particles.