H_2S Gas Sensitivity of Nanocrystalline Tin Dioxide Doped with Ytterbium (Yb) and Praseodymium (Pr)

• 出 处: 稀有金属材料与工程
• 发表日期: 2006年S3期
• 关键词: doping selectivity dioxide catalysis adding oxidized mixing Sensitivity ammonia

The influence of Yb_2O_3 and Pr_2O_3 doping on electrical and gas sensing properties of tin dioxide was studied.A doping content of 0.5wt%～5wt% was investigated by mechanical mixing.The significant improvement on sensitivity and selectivity to 200μg/g hydrogen sulphide gas has been achieved by 3wt% Pr_2O_3 and 5wt% Yb_2O_3 adding.The better response and revovery properties of Pr or Yb doped tin dioxide sensor for 200μg/g hydrogen sulphide gas were found.The maximum sensitivity to H_2S gas is observed at about 120℃.Pr has stronger catalysis than Yb for H_2S reaction on SnO_2 surface.S~ 2-) was oxidized to S~ 6+) on the SnO_2 surface according to XPS.

The influence of Yb_2O_3 and Pr_2O_3 doping on electrical and gas sensing properties of tin dioxide was studied. An doping content of 0.5 wt% ~ 5 wt% was investigated by mechanical mixing. The significant improvement on sensitivity and selectivity to 200 μg / g hydrogen sulphide gas has was achieved by 3 wt% Pr 2 O 3 and 5 wt% Yb 2 O 3 addition.The better response and revovery properties of Pr or Yb doped tin dioxide sensor for 200 μg / g hydrogen sulphide gas were.The maximum sensitivity to H 2 S gas was observed at about 120 ° C. Pr has stronger catalysis than Yb for H_2S reaction on SnO_2 surface.S ~ 2-) was oxidized to S ~ 6+) on the SnO_2 surface according to XPS.