Temperature dependent sensor response caused by polymer-solvent interactions

摘要

Absorption of organic solvents by a range of polymers has been used as the chemical transduction mechanism for a variety of sensors. This paper examines the effect of the polymer-solvent interaction on the temperature dependence of the sensor response. Optical interferometric cavities are formed on the end of an optical fiber by plasma-deposition of a fluorocarbon polymer. Swelling of the polymer when exposed to various solvent vapors produces changes in the reflectivity of the fiber tip. The temperature dependence of the sensor response is related to the strength of the polymer-solvent interaction and the heat of vaporization of the solvent.