POROUS PROTECTIVE LAYER FOR GAS SENSOR, METHOD FOR PRODUCING SAME, AND GAS SENSOR COMPRISING SAME

摘要

The present invention provides a method for producing a porous protective layer for a gas sensor. The production of the porous protective layer according to one embodiment of the present invention comprises the steps of: (1) introducing, into a sensing electrode for a gas sensor, a porous protective layer forming composition comprising a pore former and a ceramic powder represented by relational formula 1 according to the present invention and comprising particles having a degree of variance of at least 1.5; and (2) sintering the introduced porous protective layer forming composition. Accordingly, the present invention allows the production of a porous protective layer for a gas sensor, which can not only protect the gas sensor from an external physical impact and physical/chemical external factors, such as liquid substances and poisonous substances, which may be included in gases being tested, but also prevent the reduced output of the gas sensor caused by the external factors and allow the concentrations of target gases to be more rapidly and accurately measured.