【摘要】 SnO₂、ZnO等金属氧化物的气敏特性通常以它们在不同气氛中电导值的变化来体现。为弄清这类多晶材料及气敏元件电导变化的基本规律,本文根据表面势垒控制模型和晶界势垒控制模型讨论了氧空位密度对SnO₂多晶材料及气敏元件电导值的重要影响,并根据SnO₂多晶电导的氧空位控制模型,讨论了在不同烧结条件下元件电导的变化规律,并用X光电子能谱（XPS）对结果进行了分析。更多还原

【Abstract】 By analysing the relationship between the density of oxygen vacancies and the surface potential barrier of SnO₂ grain, the effects of the oxygen vacancy density on the electrical conductivity of tin oxide gas sensors, as well as the process of production and recombination of the oxygen vacancies, an oxygen vacancy domination model for electrical conductivity of polyerystalline tin oxide is established. The model explaines the changes in electrical conductivity of the sensors under different sintering conditions. It has been verified by X-ray photoemission spectroscopy measurements.更多还原