Co/ATO复合薄膜的结构与电磁光特性

以低成本的无机盐 SnCl₂·2H₂O、SbCl₃和Co(NO₃)₂·9H₂O 为原料，采用溶胶-凝胶法与浸渍提拉技术成功地制备出Co掺杂的ATO(Sb掺杂SnO₂)复合薄膜。利用XRD、SEM、四探针电阻仪、紫外-可见光分光光度计及振动样品磁强计(VSM)等测试方法对Co/ATO复合薄膜的结构与物性进行了表征与评价。结果表明：少量的Co 掺杂ATO复合薄膜仍保持四方金红石结构，复合薄膜中的晶粒分布均匀，其晶粒尺寸分布为4～7 nm；随着Co含量的增加，Co/ATO复合薄膜的电阻率呈现出先降低后提高，且当Co含量为0.5 mol %时，Co/ ATO复合薄膜的电阻率最低为5. 6×10- 3Ω·cm；在400～700 nm可见光范围内，平均透过率达到90 %以上，其光学带隙在3.9～4.0eV之间，且随着Co含量的增加，可见光透过率和光学带隙呈下降趋势；Co含量为3.0 mol%的ATO复合薄膜具有室温铁磁性，其矫顽力约为100Oe，磁性根源主要归结为磁性原子与基体载流子相互作用的结果。

Structures and electro-magnetic and optical properties of the Co doped ATO composite thin films

The Co doped ATO (Antimony (Sb) doped tin oxide (SnO2)  composite films were successfully synthesized by using sol-gel combined with dip-coating methods and originating from the primary materials of SnCl2·2H2O，SbCl3 and Co(NO3)2· 9H2O. The structures and properties of Co/ATO composite films were characterized by X-ray diffraction (XRD)，scanning electron microscope (SEM)，four-probe method，ultraviolet visible near-infrared spectrophotometer and vibrating sample magnetometer (VSM). The results indicate that a tetragonal rutile structure is retained by a little Co doped ATO，and the nano-particles are well distributed in the thin films and their size can be controlled in the range of 4～7 nm. With increasing the Co content，the resistivity of the composite films decreases and then increases，and it presents a very low value at 0.5 mol% Co. In the range of 400～700 nm visible region，the transmit tance values are up to 90 %，also the transmit tance in the visible region and the optical band gap trends to decrease with increasing the Co content. The room temperature ferromagnetism of the composite film has a coercive force of about 100 Oe when the Co-doped is 3.0 mol%，and it is mainly originated from the interaction of magnetic atoms and the body carrying ions.