Humidity sensing characteristics of manganese oxide prepared by sol-gel method

摘要

Electrolytic manganese dioxide (EMD), which has been commonly used as a cathode material in dry-cell batteries, catalyst and water purification material, is a typical example of a multifunctional material. Xu and Miyazaki [1,2], found that EMD derivatives could be utilized for humidity sensor materials [1], and developed a resistance-type humidity sensor with a high sensitivity and selectivity [2]. Recently, a new potential-type humidity sensor consisting of EMD solid electrolyte with two electrodes of different metals, such as Pt/Cu or Pt/Al, was explored [3,4]. The humidity sensing properties were strongly dependent on the features of manganese oxides such as crystalline structure and powder morphology, so further research was needed for the development of an efficient humidity sensing system.