SENSING AMMONIA WITH FERROCENE-BASED POLYMER-COATED TAPERED OPTICAL FIBERS

The application of ferrocene-based polymers as variable index material s is discussed. The refractive index of thin film of a particular poly mer known as poly(methylphenylsilyeneferrocenylene) is examined during exposure to ammonia, nitrous oxide, nitric oxide, nitrogen, carbon di oxide, carbon monoxide, and argon. A maximum of 9% deviation in the re fractive index of the polymer upon exposure to ammonia is observed. Th e theory of operation and fabrication of polymer-coated tapered optica l fiber gas sensors are explained. Experimental data is presented show ing qualitative response to ammonia and other gases.