微波水解法制备掺钇二氧化锡气敏材料的研究

Study of Microwave Hydrolysis Process for Preparation of Yttrium-doped Tin Dioxide Gas Sensing Material

以SnCl_4·5H_2O、尿素CO(NH_2)_2和YCl_3为原料,利用微波水解法分别制备了纯的和n(Y^(3+))为2%、3%、4%、5%的SnO_2纳米粉体。利用XRD对其进行物相分析,SEM观察其形貌。就其对1 000 mg/L质量浓度汽油的灵敏度进行测试。结果表明:Y^(3+)的掺杂抑制了SnO_2晶粒的生长,且掺杂对SnO_2晶格没有影响;当工作温度为400℃时,适量Y^(3+)的掺杂提高了对汽油的灵敏度;最佳工作温度时,n(Y^(3+))为2%的SnO_对1 000 ng/L的汽油灵敏度最大为20.7,明显优于对1 000 mg/L丙酮的灵敏度。

Pure SnO_2 nanometer powder and doped SnO_2 nanometer powders with n(Y^(3+)) of 2%,3%,4%and 5%respectively are produced with microwave hydrolysis process using SnCl_4·5H_2O,CO(NH_2)_2 and YCl_3 feed.XRD is used to carry out the phase analysis for them and SEM is used to observe their appearance.The sensitivity test to gasoline has been done based on its 1 000 mg/L mass concentration.The result shows that,doping Y^(3+) inhibits the growth of SnO_2 crystal lattice,and tbe doping has no influence on SnO_2 crystal lattice;when the working temperature is 400℃,the proper doping Y^(3+) can increase the sensitivity to gasoline.At the optimum operating temperature,the sensitivity of SnO_2 doped with n(Y^(3+)) of 2%to gasoline with 1 000 mg/L is 20.7,which is obviously better than the sensitivity to acetone with 1 000 mg/L.