Patent ID: 8372256
Filing Date: 2013-02-12
Classification: G01N

Abstract:
1. A gas sensor element that detects a concentration of a specific gas component contained in a target detection gas, placed in a gas passage through which the target defection gas flows, comprising: a sensor section comprising a solid electrolyte layer and a pair of electrodes, where the solid electrolyte layer is made of solid electrolyte material having an electrical conductivity to a specific ion, and the pair of electrodes formed on a surface of the solid electrolyte layer; a heater section for heating and activating the sensor section; a porous protective layer covering a surface of the sensor section and a surface of the heater section which are exposed to the target detection gas, wherein the porous protective layer is made of a mixture composed of at least one kind of hydrophobic heat resisting particles and at least of one is kind of hydrophilic heat resisting particles which have a different contact angle to a drop of water, and wherein the hydrophobic heat resisting particles are heat resisting particles having a BET specific area of not more than 10 m