Chemiresistor

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 relies on the direct chemical interaction between the sensing material and the analyte. The chemical interaction between the sensing material and the analyte can vary from a covalent interaction, to hydrogen bonding interactions, to shape 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.