锑掺杂二氧化锡实心球和空心球的碳还原制备及其生长机理研究

通过在水平管式炉中用石墨还原锑掺杂二氧化锡(ATO)纳米颗粒的方法制备了ATO的实心球和空心球, 并用EDX和XRD等技术分析了产物的物相和元素组成; 用FE-SEM和TEM观察了其形貌; 用HRTEM分析了其晶格结构. 结果表明, 产物为直径0.2~5 μm的ATO实心球和直径为2~20 μm的ATO空心球. 通过控制Ar流速和沉积位置控制了ATO实心球的尺寸和产量, 用Ostwald Ripening分析了ATO实心球的生长过程. ATO空心球的制备在具有较高氧浓度、长度稍长于刚玉管的陶瓷管中进行, 对其生长机理进行了讨论, 分析了相同条件下使用不同材质的管子生成不同形貌产物的原因.

Carbothermal Reduction Synthesis and Growth Mechanism of Antimony Doped Tin Oxide Solid and Hollow Spheres

Antimony doped tin oxide(ATO) solid and hollow spheres were fabricated by reducing ATO nanoparticles with graphite as the reducer in the high temperature tube furnace. The phase, element composition, morphologies and crystalline structures of the as-synthesized sample were characterized by XRD, EDX, FE-SEM, TEM and HRTEM, respectively. The results show that the products are ATO solid and hollow spheres with the diameters of about 0.2—5 μm and 2—20 μm, respectively. The size and yield of the solid spheres could be controlled by adjusting the rate of Ar flow and deposition positions. Ostwald Ripening was employed to explain the growth of solid spheres. ATO hollow spheres were synthesized in alumina tube system which has a relatively high oxygen concentration, and its growth mechanism was also discussed. The reason for why the spheres with different morphologies were synthesized by using different tubes under the same conditions was analyzed.