US 2011/0209527 A1 · GAS SENSOR

Abstract

A gas sensor having high detection sensitivity and a low output signal noise includes a laminate of thermistor ceramic, a catalytic electrode, an internal electrode, and external electrodes. When coming into contact with a detection target gas, the catalytic electrode generates heat, and the resistance of a thermistor layer of a sensing portion is decreased. Since the heat generated by the catalytic electrode is directly transferred to the thermistor layer without passing through an insulating layer or the like, high detection sensitivity is obtained. In addition, the structure can be formed in which heat of the sensing portion is insulated by a hollow portion and heat diffusion is prevented, so that the heat capacity of the sensing portion is further decreased.

Claims20

Dependent claims

A gas sensor comprising a laminate which includes a plurality of electrodes and a plurality of thermistor layers,

wherein one of the plurality of electrodes constitutes a catalytic electrode which is disposed at a surface of the laminate and catalyzes an exothermic or an endothermic reaction when coming into contact with a detection target gas, and
a different one of the plurality of electrodes is an internal electrode which is disposed so that at least one of the plurality of thermistor layers is between the internal electrode and the catalytic electrode.

Dependencies are inferred from the claim text.

Gas sensor

Life of this patent

Gas sensor

Life of this patent

Abstract

Claims20