Chemiresistor | Wikipedia audio article
Channel: wikipedia tts
Date: 21/01/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Chemiresistor


00:01:28 1 History
00:02:33 2 Types of chemiresistor sensors
00:02:43 2.1 Device architectures
00:04:05 2.2 Sensing materials
00:04:14 2.2.1 Metal oxide semiconductors
00:05:13 2.2.2 Graphene
00:05:45 2.2.3 Carbon nanotubes
00:06:55 2.2.4 Nanoparticles
00:08:29 2.2.5 Conductive polymers



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SUMMARY
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A chemiresistor is a material that changes its electrical resistance in response to changes in the nearby chemical environment. Chemiresistors are a class of chemical sensors that rely on the direct chemical interaction between the sensing material and the analyte. The sensing material and the analyte can interact by covalent bonding, hydrogen bonding, or molecular recognition. Several different materials have chemiresistor properties: metal-oxide semiconductors, some conductive polymers, and nanomaterials like graphene, carbon nanotubes and nanoparticles. Typically these materials are used as partially selective sensors in devices like electronic tongues or electronic noses.
A basic chemiresistor consists of a sensing material that bridges the gap between two electrodes or coats a set of interdigitated electrodes. The resistance between the electrodes can be easily measured. The sensing material has an inherent resistance that can be modulated by the presence or absence of the analyte. During exposure, analytes interact with the sensing material. These interactions cause changes in the resistance reading. In some chemiresistors the resistance changes simply indicate the presence of analyte. In others, the resistance changes are proportional to the amount of analyte present; this allows for the amount of analyte present to be measured.