多功能NiO-SnO_2气敏材料的敏感特性

Sensing Characteristics of Multifunction Gas-Sensing Materials of NiO-SnO_2

采用化学共沉淀法合成了不同配比的NiO-SnO_2气敏材料。用X射线衍射法分析了材料的结构与组成,测试了元件的气敏性能,并利用表面催化作用较好地解释了材料的敏感机理。通过改变NiO的掺杂量及气敏元件的加热功率,NiO-SnO_2材料可分别实现对H_2,C_2H_5OH的选择性检测以及对C_2H_5OH、H_2、CO、C_4H_(10)和汽油等气体的广谱检测。

NiO-SnO_2 gas sensing materials of different mole ratio were made by chemical co-precipitation. The composition and structure of the materials were analyzed by means of X-ray diffraction, and the gas-sensing properties were measured with RQ-2 type gas-sensing analyzer. In addition, gas-sensing mechanism of the materials was explained with catalytic effect of NiO and ABO_3 oxides. NiO-SnO_2 sensors can be used to detect inflammable gases and selectively detect H_2or C_2h_4OH by changing heating power and doping quantity of NiO.