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Mastering (Bio)Chemical Sensors: Design, Principles, and Applications

Explore the world of (bio)chemical sensors with this comprehensive guide! Understand how these devices convert chemical quantities into electrical signals and learn about their selectivity based on reaction mechanisms. Discover common materials, chemoresistors, chemocapacitors, chemodiodes, and chemotransistors, with examples and structures provided.

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Mastering (Bio)Chemical Sensors: Design, Principles, and Applications

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  1. (Bio)Chemical Sensors • A (bio)chemical sensor is a device which is capable of converting a chemical (or biological) quantity into an electrical signal. • Interaction of a chemical species (X) with the sensing material (M) may often be described as • The selectivity of a chemical sensor depends on the nature of the reaction mechanism.

  2. Principles, Measurands and Typical Examples of (Bio)Chemical Sensors

  3. Common Materials for (Bio)Chemical Sensors

  4. Chemoresistors • The simplest type of chemical sensors is the chemoresistor in which a change in the electrical conductivity of a chemically-sensitive layer is measured. A schematic structure of a chemoresistive gas sensor

  5. Chemocapacitors • It is possible to measure the gas sensitivity of the dielectric constant of a film using a parallel-electrodes arrangement. Structure Typical response

  6. Chemodiodes Structure Response of an organic chemodiode in sensing Nox and NH3

  7. Chemotransistors • A MOSFET hydrogen sensor exhibits a shift in threshold voltage, DVT. Structure of Pd-gate gas sensitive MOSFET Response of a chemotransistor

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