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Chemical Sensors: Simulation and Modeling Volume 2: Conductometric-Type Sensors by Ghenadii Korotcenkov

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CHAPTER 2

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CO-ADSORPTION PROCESSES AND QUANTUM MECHANICAL MODELING OF GAS-SENSING EFFECTS

J.-J. Velasco-Vélez

1. INTRODUCTION

The history of semiconductor gas sensors began in the 1920s with Lilienfeld’s patent, entitled “Method and Apparatus for Controlling Electric Currents” (Lilienfeld 1930). In this device a semiconducting thin-film material (polycrystalline copper sulfide) is deposited at the top of a gated structure composed by aluminum oxide (dielectric) and aluminum (gate); see Figure 2.1. Its conductivity is modified by changes to the gate potential. Because of surface effects, the device exhibited unexpected behavior. Thus, it was not ...

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