A new type of semiconductor gas sensor based on the n plus n combined structure

In this paper, a new type of semiconductor gas sensor based on the n + n co mbined structure is reported. The combined structure semiconductor gas sens or is a novel gas sensor which is based on the complementary feedback and c omplementary multiplication principle. The sensor is composed of two sensit ive bodies A and B whose conductive types are same. A and B are all n type materials. The results analyzed from theoretical viewpoint showed that when A and B satisfied certain conditions, the sensor not only realized multipl ication of selectivity, but also had better thermal stability. According to the sensor's structure and meeting conditions, we prepared the n + n type gas sensor for gasoline. The experimental results showed that they concurre d with theoretical analysis very well. (C) 2001 Elsevier Science B.V. All r ights reserved.