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气敏材料的气敏特性来源于气体在材料表面的吸附和表面反应过程。传统的气敏材料测试方法仅仅测试材料在与气体接触前后电阻的变化 ,只能反映气体吸附的结果 ,而不能反映吸附和解吸的动态过程。本文提出了一种新的气敏材料测试方法 ,在间断加热的过程中测试气敏材料的动态特性。由于工作温度的变化 ,气敏材料的电阻按一定规律变化。不同气体在材料表面有不同的吸附机理和活化能 ,温度变化时气体在材料表面的反应平衡发生变化。根据这一原理可以得到气体的特征谱线 ,从而使气敏材料具有优良的选择性。
Gas sensing properties of gas-sensitive materials from the surface of the gas adsorption and surface reaction process. The traditional method for testing gas-sensitive materials only tests the change of electrical resistance before and after contact with gas, which can only reflect the result of gas adsorption, but can not reflect the dynamic process of adsorption and desorption. In this paper, a new gas sensing method is proposed to test the dynamic characteristics of gas sensing materials during intermittent heating. Due to the change of working temperature, the resistance of gas-sensitive material changes according to certain rules. Different gases have different adsorption mechanisms and activation energies on the surface of the material, and the reaction equilibrium of the gas on the surface of the material changes when the temperature changes. According to this principle can be gas characteristics of the spectrum, so that gas-sensitive materials have excellent selectivity.