EVALUATION OF A CATHODICALLY PRECIPITATED ALUMINUM HYDROXIDE FILM AT A HYDROGEN-SORBING PALLADIUM ELECTRODE AS A HUMIDITY SENSOR

The application of a cathodic precipitation technique Tor the generati on of films of alumina precursors at a hydrogen sorbing palladium elec trode to the manufacture of humidity sensing materials is reported. Th e response to changing atmospheric humidity of a device fabricated by this electrochemical method has been compared to that of a commerciall y available sensor. AC impedance techniques have been employed to prob e the electrochemically generated sensor's conduction mechanisms at va rious humidity levels, and an equivalent circuit model has been propos ed for the device.