Chemical Sensing Concept Based on Conductive Polymer Coated Fibers

摘要

A novel sensing format for the detection of toxic vapors is presented, that usesthin films of conductive polymers, poly(pyrrole) or poly(aniline), coated onto polyethylene terephthalate or nylon threads woven into a fabric mesh. Chemical sensing on fabrics offers the opportunity of using the large surface area for improved sensitivity and expanded dynamic range. The resistivity of these materials was monitored following exposure to several toxic gases. Parts-per-million (ppm) detection limits were demonstrated for various pollutants and chemical warfare simulants, including dimethyl methylphosphonate (DMMP), ammonia, and nitrogen dioxide. The effect of humidity on the detection capabilities of these materials was also characterized. Polymeric overcoats including poly(ethyleneimine) and fluoropolyol were evaluated as a means of introducing selectivity and sensitivity with respect to the adsorption of particular classes of gas analytes. Developmental issues of a working prototype utilizing battery power are addressed. jg p3.