High Conductivity La_(2-x)Sr_xCu_(1-y)(Mg,Al)_yO_4 Solid State Metal Oxide Gas Sensors with the K_2NiF_4 Structure

摘要

Materials of the K_2NiF_4 structure type have been identified as new highly conducting conductometric gas sensors.The materials of interest are based on substituted La_2CuO_4,a known superconducting material at low temperatures.La_2CuO_4 has been substituted with Sr for La and with Al or Mg for Cu,and sensitivity was demonstrated toward CO,NH_3,and NO_2 gases at temperatures in the range 300-600 deg C.The level and type of substitution can be adjusted to enhance selectivity and minimize humidity interference.As a result of the relatively high conductivity of these sensor materials there is great potential for miniaturization of devices for use in small area applications.Uncomplicated electrode requirements also mean a simplification of the manufacturing of these new devices.