Sm掺杂量对水热法合成气敏材料SnO2纳米结构性能的影响

Effect of Sm doping amount on the properties of SnO2 nanostructures

本文采用水热法制备SnO2纳米结构,采用Sm对其进行掺杂处理,并检测了材料的组织及气敏特性。结果表明:Sm掺杂前后,试样中均形成了具有良好结晶结构的SnO2;掺杂稀土Sm对纳米棒生长具有明显的抑制作用,掺杂4%与6%Sm的产物晶相结构中生成了Sm2Sn2O7相,掺杂6%Sm时形成的纳米棒尺寸变得更加细小;随着掺杂Sm的原子分数增大,元件测试异丙醇的灵敏度不断提升;SnO2在空气中发生老化导致SnO2阻值降低,表现出优异的气敏特性。

In this paper,SnO2 nanostructures were prepared by hydrothermal method,doped by Sm,and the structure and gas-sensitive properties of the materials were tested.The results show that SnO2 with good crystal structure is formed in the sample before and after Sm doping.Rare earth Sm has obvious inhibition effect on the growth of nanorods.Sm2Sn2O7 structure is formed in the crystal structure of the product doped with 4%and 6%Sm,and the size of nanorods becomes smaller when doped with 6%Sm.With the increase of the atomic fraction of doped Sm,the sensitivity of component for testing isopropanol increases continuously.The aging of SnO2 in air results in the decrease of SnO2 resistance,which shows excellent gas-sensitive characteristics.