Relationship between microstructure and gas sensing characteristics of ceramic gas sensors was described, and highly functional gas sensors using ultrafine particles were reviewed.Using ultrafine particles brings about activation of particle-surface (for adsorption and redox reaction) as well as increases of surface area and contact-points of particles. As a result, a high sensitivity, rapid response and detection of inactive gas species become possible.
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Masaru Miyayama (1987) studied this question.