Development of New Catalytic Combustion Sensor for Breath Alcohol

Abstract

The authors developed breath alcohol sensor with high accuracy, good durability, quick response, stability and linear output. Key technologies of sensor system are fine Ni coil and new catalysis of CoOx/CuO/Al₂O₃. Catalyst layers, which are coated by electrophoresis, are designed to form hollow cylindrical body on Ni coil. Large surface area of catalyst layer, large temperature dependence of Ni coil resistivity and high selectivity enable to detect level of 70~400ppm with high sensitivity.