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前言近年来,国内外用气敏半导体作为气体鉴测器已很普遍。我们研制了一种N型气敏半导体作为气相色谱鉴测器。并用之对稀有气体中的微量氢,电力变压器油中的溶解气体和工厂乙烯车间的大气等分析,以及对高分子热释气体分析和石油勘探中油气层的显示等方面进行了鉴测,证明性能良好,可以在生产实际中使用。气敏半导体的鉴测原理,可认为是由于气体吸附在半导体表面而形成某种键,并改变其表面的电子分布,而引起电导率的变化,气体逸出时,电导率恢复原值。气敏半导体分N型和P型两种,N型半导体对还原性,可燃性气体,如氢,乙醇,烃类等特别灵敏,一般可测至ppb-ppm级。气敏半导体材料必需具有高的气敏性和适当的
Foreword In recent years, domestic and foreign gas-sensitive semiconductors as gas detectors have been very common. We have developed an N-type gas sensing semiconductor as a gas chromatographic detector. And with the trace of rare gas hydrogen, power transformer oil dissolved gas and plant ethylene plant atmospheric analysis, as well as the polymer pyroelectric gas analysis and oil exploration in the oil and gas layer display were tested and proved Good performance, can be used in production practice. The principle of gas-sensing semiconductors can be considered as the gas adsorption on the semiconductor surface and the formation of a bond, and change the surface of the electronic distribution, and cause changes in conductivity, the gas escape, the conductivity return to its original value. Gas-sensitive semiconductors are classified into two types, N-type and P-type. N-type semiconductors are particularly sensitive to reducing and flammable gases such as hydrogen, ethanol and hydrocarbons, and generally can be measured to ppb-ppm level. Gas sensitive semiconductor materials must have high gas sensitivity and appropriate