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1962年清山哲郎提出ZnO薄膜的气敏特性后,研究目标较集中于以ZnO,SnO_2,γ-Fe_2O_3和α-Fe_2O_3为基质的氧化物半导体陶瓷材料,并已有商品出售.氧化铁基气敏材料与氧化锌、氧化锡相比,它有无需添加贵金属催化剂便可达到实用气敏灵敏度的优点.我们也曾从催化活性、磁学性能和气敏特性等方面,对α-Fe_2O_3基气敏材料的气敏机制进行了研究,得到满意的结果.本文旨在探讨α-Fe_2O_3-SnO_2配比和氧化铁粒度与气敏性能间关系,并且也浅析了气敏机制,以期为此复合材料实用化提供依据.
In 1962, Tetsuya Kiyama proposed the gas sensing properties of ZnO thin films, and the research targets are focused on the oxide semiconductor ceramic materials based on ZnO, SnO 2, γ-Fe 2 O 3 and α-Fe 2 O 3 and are sold commercially. Compared with zinc oxide and tin oxide, the material has the advantages of practical gas sensitivity without adding precious metal catalyst.We have also studied the catalytic activity, magnetic properties and gas sensing properties of α-Fe 2 O 3 -based gas-sensing materials The gas sensitization mechanism was studied and satisfactory results were obtained.The purpose of this paper is to investigate the relationship between α-Fe_2O_3-SnO_2 and iron oxide particle size and gas sensitivities, and also to analyze the gas sensing mechanism, To provide the basis.