前言 SnO_2系氧化物半导体陶瓷是目前最常用的气敏材料。因其灵敏度高、工作温度较低而得到了广泛应用。选择适当的催化剂还可降低工作温度,或可提高选择性。在被检气氛中,氧化物表面会发生物理和化学吸附,致使表面能态发生改变,因而引起材料电导率的变化。无疑,材料本性及半导瓷的制备条件将直接影响着它们的表面状态,因而影响检出性能。为要研究材料的特性,人们往往把它作成元件,而对元件进行参 Preface SnO2-based oxide semiconductor ceramics are currently the most commonly used gas-sensitive materials. Because of its high sensitivity, low temperature and has been widely used. Choosing the right catalyst can also lower the operating temperature or increase the selectivity. In the seized atmosphere, the oxide surface will be physically and chemically adsorbed, resulting in changes in the surface energy state, which led to material conductivity changes. Undoubtedly, the nature of the material and preparation conditions of the semiconducting porcelain will directly affect their surface state, thus affecting the detection performance. In order to study the characteristics of materials, people often make it as a component, while the component reference