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中文摘要：
利用模板法和溶胶-凝胶法分别制备了SnO2和LaFeO3纯材料，并检测了纳米复合材料SnO2／LaFeO3对Co的气敏性能。在实验过程中，观察到纳米复合材料85%SnO2＋15％LaFeO3（85Sn—La）及90%SnO2＋10％LaFeO3（90Sn—La）在检测CO时出现了一个反常现象，通常Co表现为还原性气体的性质，然而在T≤200。C的温度范围内，与CO的作用增加了复合氧化物85Sn—La及90Sn—La的电阻，而这一现象只在与氧化性气体反应时观察过。这种在特定环境下，n型材料与还原性气体（施主）作用时，其导电特征表现为与氧化性气体（受主）作用时相同的现象称为类受主现象。类受主现象只在低温阶段被观察到，且复合氧化物85Sn—La表现最为明显。利用温度、气氛与材料表面的交互作用来解释所观察到的实验现象：在低温情况下，CO与材料表面的吸附氧及羟基发生反应，增加了表面的电荷，降低了材料表面的导电性，因而表现为类受主现象。
英文摘要：
Template method and sol-gel method have been used to synthesize SnO2 and LaFeO3, and the CO gas sensing properties of the as-prepared SnO2/LaFeO3 nanocomposites have been studied, During the test, an a nomalous phenomenon has been observed： nanocomposites 85%SnO2 ＋ 15% LaFeO3 （85Sn-La） and 90 %SnO2 ＋ 10 % LaFeO3 （90Sn-La） showed a decreased conductivity towards interaction with CO at temperature lower than 200 ~C, which we call it an acceptor-like behavior. Acceptor-like behavior has been observed at low temperature only and shows a maximum aeceptor effect for nanocomposite 85Sn-La. The interaction between temperature; gas and the material surface has been proposed to explain the observed behavior. At low temperature, a reaction between CO and hydroxyl absorbed on the surface will occur, resulting in the increase of the material surface charge and the decrease of the conductivity.
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