以SnCl4.5H2O和SbCl3为主要原料,采用sol-gel法制备了锑掺杂二氧化锡（ATO）纳米粉体。分别利用FESEM、XRD、FT-IR、XPS及四探针电阻仪对粉体形貌、晶体结构、元素组成和粉末电阻进行表征,考察Sb掺杂量对ATO粒子晶体结构、晶粒尺寸和导电性能的影响。结果表明所制备的ATO为（110）面择优取向的四方相锡石结构的纳米颗粒,当Sb掺杂量为15%（摩尔分数）时,ATO具有最小的粉末电阻率（12.85Ω.cm）。当Sb掺杂量≤28%时可得到完全掺杂的ATO,ATO的导电性与其中的Sb5＋离子浓度有关,而且Sb含量在28%以下可能存在一个阈值,有利于固溶在SnO2晶格中的Sb形成Sb5＋,使载流子浓度达到最大,因而表现出最佳的导电性能。
Using sol-gel method with the simple starting reagents of SnCl4·5H2O and SbCl3,antimony doped tin oxide（ATO） nanoparticles were synthesized.The microstructure,composition and conductivity properties were characterized by FESEM,X-ray diffraction（XRD）,Fourier transform infrared spectrophotometer（FT-IR）,X-ray photoelectron spectroscope（XPS） and four-probe resistivity/square resistance tester,and the effects of the Sb content on the crystalline microstructure,the crystalline size and the resistivity of the ATO nanoparticles were investigated systematically.The results show that the as-synthesized ATO was with tetragonal cassiterite crystalline structure of SnO2 and the preferred orientation was observed as（110）,and its resistivity was obtained to be as lowest as 12.85Ω·cm when the Sb content was 15%.The complete doped ATO can be obtained with the Sb contents less then 28%.The conductivity of the ATO was related with the concentration of Sb5＋,and there is an optimal value of Sb contents that is beneficial for Sb converting to Sb5＋,and it make the carrier concentration to the maximum,so it deserves the optimum conductivity.
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