Daniel A. Mirabella, Paula M. Desimone, Celso M. Aldao
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引用次数: 0
Abstract
The electrical resistance of gas sensors, based on polycrystalline metal-oxide semiconductors, obeys a power-law response with the pressure of different gases (R ~ pγ). The exponent γ can be derived resorting to the mass action law and its value depends on chemical reactions that take place at the surface of the grains. To explain the gas sensitivity, we revisit two conceptual models, regularly used in the literature: the ionosorption and the vacancy models. We show that they predict different values for the exponent γ. Also, the consequences of considering the bulk oxygen vacancies as deep levels are analyzed. Comparison of γ values obtained from both conceptual models with those found in experiments can indicate what mechanisms are possible to occur.
期刊介绍：
While ceramics have traditionally been admired for their mechanical, chemical and thermal stability, their unique electrical, optical and magnetic properties have become of increasing importance in many key technologies including communications, energy conversion and storage, electronics and automation. Electroceramics benefit greatly from their versatility in properties including:
-insulating to metallic and fast ion conductivity
-piezo-, ferro-, and pyro-electricity
-electro- and nonlinear optical properties
-feromagnetism.
When combined with thermal, mechanical, and chemical stability, these properties often render them the materials of choice.
The Journal of Electroceramics is dedicated to providing a forum of discussion cutting across issues in electrical, optical, and magnetic ceramics. Driven by the need for miniaturization, cost, and enhanced functionality, the field of electroceramics is growing rapidly in many new directions. The Journal encourages discussions of resultant trends concerning silicon-electroceramic integration, nanotechnology, ceramic-polymer composites, grain boundary and defect engineering, etc.
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